Solenoid Buying Guide: Different Solenoid Types, Functions & Applications

1. Introduction to Solenoids

2. How Solenoids Work – Technical Principles

3. Push-Pull Solenoids (Linear Solenoids)

4. Rotary Solenoids

5. Tubular Solenoids

6. Bistable Solenoids (Latching Solenoids)

7. Open Frame Solenoids

8. Specialty Solenoids

9. Solenoid Valves

10. Technical Specifications and Parameters

11. How to Select the Right Solenoid

12. Solenoid Calculation Formulas

13. Installation and Wiring Guide

14. Maintenance and Troubleshooting

15. Industry Applications in Detail

16. Quality Standards and Certifications

17. Custom Solenoid Design Process

18. Cost Factors and Pricing

19. Supplier Selection Criteria

20. Future Trends in Solenoid Technology

21. FAQ – Frequently Asked Questions

22. Case Studies

23. Conclusion

1. Introduction to Solenoids

What is a Solenoid?

At its core, a solenoid is one of those beautifully simple devices that does exactly what it sounds like it should: turn electricity into motion. Picture a coil of copper wire wrapped around a tube, with a metal plunger sitting inside. Flip the switch, current flows, magnetism happens, and the plunger gets pulled in. That’s a solenoid in a nutshell — nothing fancy, but incredibly useful.

Brief History of Solenoid Development

Here’s something that surprises a lot of people: solenoids aren’t exactly new. Hans Christian Ørsted stumbled onto electromagnetism back in 1820, and by the late 1800s, people were already using solenoids in telegraph systems and early electrical switches. (I always find it humbling that technology we still rely on today was cutting-edge Victorian-era engineering.) From there, solenoids slowly evolved into the precision components you’d find in just about every factory and appliance on the planet now.

Importance in Modern Industry

If industrial automation were a body, solenoids would be the muscles — they do the pushing and pulling that keeps everything running. And honestly, they’re the kind of workhorses that don’t get enough credit. Most people never think about them, but you’d find them in millions of machines:

– Reliable actuation – Millions of cycles without failure

– Fast response – Millisecond-level switching speed

– Compact size – High force-to-size ratio

– Cost-effectiveness – Simple design, low manufacturing cost

– Versatility – Suitable for countless applications

The numbers back this up too. The global solenoid market hit USD 4.2 billion in 2023, and it’s projected to grow at about 5.8% annually through 2030. The usual suspects are driving that growth — factory automation, the shift to electric vehicles, and the proliferation of smart home gadgets.

2. How Solenoids Work – Technical Principles

Basic Electromagnetic Principle

Okay, let’s get slightly more technical (but not too much — I promise). When current flows through a coil of wire, it creates a magnetic field. The strength of that field depends on a few things:

B = μ₀ × μᵣ × (N × I) / L

Where:

B = Magnetic flux density (Tesla)

μ₀ = Permeability of free space (4π × 10⁻⁷ H/m)

μᵣ = Relative permeability of core material

N = Number of coil turns

I = Current (Amperes)

L = Coil length (meters)

Force Generation

Once you’ve got that magnetic field going, you can generate force. The electromagnetic force (F) works out to approximately:

F = (B² × A) / (2 × μ₀)

Where:

F = Force (Newtons)

A = Cross-sectional area of the plunger (m²)

Types of Motion

Linear Motion (Push-Pull)

The plunger slides straight in and out of the coil. If you’ve ever taken apart an old printer or a washing machine door latch, you’ve probably seen one of these in action. It’s the most common arrangement by far.

Rotary Motion

Some applications need rotation instead of sliding. In those cases, the armature swings through an angle — typically somewhere between 25° and 95°. Think of it as a solenoid that’s been engineered to twist rather than push.

Duty Cycle and Heating

One thing that trips up a lot of beginners: solenoids get hot. I mean, really hot if you’re not careful. The coil has resistance, current flows through it, and physics does the rest (I²R losses, for those keeping score). That’s why you can’t just leave a solenoid energized forever — you need to manage the duty cycle, which is basically how much time it spends actually doing work:

– Continuous Duty (100%) – Built for indefinite operation

– Intermittent Duty (ED 10-50%) – Runs in short bursts with time to cool down

– Short-time Duty – Only meant to operate for a few seconds at a stretch

3. Push-Pull Solenoids (Linear Solenoids)

Overview

Push-pull solenoids — sometimes called linear solenoids — are the workhorses of the solenoid world. I like to think of them as the default choice: when someone says “solenoid” without any other context, this is probably what they mean. They take electrical energy and convert it into straight-line back-and-forth motion.

Working Principle

Energize the coil, and the magnetic field pulls the plunger inward. Cut the power, and a spring pushes it back out (at least for the single-acting kind). Want it to push AND pull? Double-acting versions use two coils, one for each direction. It’s a pretty elegant setup, honestly.

Key Features

✅ Fast response time – 10-30 milliseconds

✅ Adjustable stroke – 1mm to 50mm typical

✅ High force at short stroke – Up to 1000N+

✅ Simple installation – Mounting holes standard

✅ Long lifecycle – 1-10 million cycles

Technical Parameters

| Parameter | Typical Range | Selection Notes |

|———–|—————|—————–|

| Rated Voltage | DC 3V-48V, AC 12V-240V | Match power supply |

| Rated Force | 0.5N – 1000N+ | Calculate required force with safety factor |

| Stroke Length | 1mm – 50mm | Longer stroke = lower force |

| Duty Cycle | 10% – 100% | Higher duty = more heat dissipation needed |

| Response Time | 10ms – 50ms | Critical for high-speed applications |

| Insulation Class | B (130°C) to H (180°C) | Match operating environment |

| Protection Rating | IP40 – IP67 | IP65+ for washdown environments |

Sizing Calculation Example

Application: Door lock actuator

Required force: 15N

Stroke: 8mm

Voltage: DC 12V

Duty cycle: 10% (intermittent use)

Solution: Select a solenoid with:

Rated force ≥ 20N (1.5x safety factor)

Stroke ≥ 8mm

DC 12V coil

ED 25% rating (margin for safety)

Applications

Industrial Automation

– Conveyor diverters – Sort packages by actuating diverter arms

– Pick-and-place mechanisms – Move small parts in assembly lines

– Clamping devices – Hold workpieces during machining

Consumer Products

– Washing machine door locks – Safety interlock

– Dishwasher detergent dispensers – Timed release

– Vending machines – Product delivery mechanisms

Automotive

– Door lock actuators – Central locking systems

– Trunk release – Remote opening

– Hood latch – Security interlock

Electronics

– Printer paper feed – Precise paper movement

– Copier document handling – Sheet feeding

– ATM card readers – Card insertion/ejection

Selection Checklist

[ ] Determine required force (with safety factor)

[ ] Measure available stroke length

[ ] Specify operating voltage (DC or AC)

[ ] Define duty cycle (continuous or intermittent)

[ ] Choose environmental protection (IP rating)

[ ] Select mounting style (flange, threaded, foot)

[ ] Specify wire length and termination

[ ] Define expected lifecycle (cycles)

[ ] Consider ambient temperature range

[ ] Check certification requirements (UL, CE, RoHS)

Common Problems and Solutions

| Problem | Possible Cause | Solution |

|———|—————|———-|

| Solenoid not actuating | No power, wrong voltage, open coil | Check power supply, measure coil resistance |

| Weak force | Low voltage, wrong duty cycle, worn plunger | Verify voltage under load, check specs |

| Overheating | Continuous duty on intermittent solenoid | Use 100% ED rated solenoid |

| Sticking plunger | Dirt, lack of lubrication, bent guide | Clean and lubricate, check alignment |

| Noisy operation | Loose mounting, high voltage, worn parts | Tighten mounting, check voltage, replace |

4. Rotary Solenoids

Overview

Sometimes you don’t need something to push in and out — you need it to twist. That’s where rotary solenoids come in. They take electrical energy and turn it into angular motion, usually somewhere in the 25° to 95° range. The nice thing about them is they can position things precisely without needing a bunch of gears and linkages.

Working Principle

Here’s the clever part: inside a rotary solenoid, the plunger has a helical groove cut into it, and there’s a pin that rides in that groove. When the coil energizes, the plunger tries to move linearly, but the pin forces it to rotate as it goes. It’s a neat bit of mechanical ingenuity that converts straight-line motion into rotation — no gears required.

Key Features

✅ Precise angular positioning – ±1° accuracy possible

✅ Smooth operation – No mechanical stop impact

✅ Compact design – Integrates motor and positioner

✅ Holding torque – Maintains position when energized

✅ Fast response – 20-50ms typical

Technical Parameters

| Parameter | Typical Range |

|———–|—————|

| Rotation Angle | 25° – 95° |

| Torque | 0.01 Nm – 2 Nm |

| Response Time | 20ms – 50ms |

| Voltage | DC 6V – 24V |

| Duty Cycle | 10% – 50% |

Applications

Precision Instruments

– Camera shutter mechanisms – Precise exposure control

– Optical instrument filters – Position selection

– Laboratory automation – Sample positioning

Smart Locks

– Electronic door locks – Deadbolt actuation

– Hotel card locks – Privacy bolt control

– Safe locks – Combination mechanism

Industrial Equipment

– Valve actuators – Quarter-turn valve control

– Conveyor diverters – Sortation systems

– Packaging machines – Flap control

Selection Calculation

Torque requirement calculation:

T = F × r

Where:

T = Torque (Nm)

F = Force required at radius (N)

r = Radius (m)

Example:

Application requires 5N force at 20mm radius

T = 5N × 0.02m = 0.1 Nm

Select rotary solenoid with rated torque ≥ 0.15 Nm (1.5x safety factor)

5. Tubular Solenoids

Overview

Tubular solenoids are what you get when someone decides solenoids need to go on a diet. The coil sits inside a sealed cylindrical housing, and this compact little package manages to pack a surprising amount of magnetic force into a tiny footprint. If you’ve got limited space and can’t compromise on strength, these are worth a look.

Key Features

✅ Miniature size – Diameter as small as 6mm

✅ Sealed construction – Dust and moisture resistant

✅ High force-to-size ratio – Optimized magnetic circuit

✅ Customizable stroke – 1mm to 15mm typical

Applications

Home Appliances

– Washing machines – Door interlock, detergent dispenser

– Refrigerators – Ice dispenser, water valve

– Air conditioners – Louver control, valve actuation

Smart Devices

– Smart locks – Compact door lock actuators

– Smart furniture – Motorized drawers, pop-up outlets

– Robotics – End-effector actuation

Medical Devices

– Infusion pumps – Valve control

– Diagnostic equipment – Sample handling

– Dental chairs – Position locks

Selection Guide

Size constraints: Measure available diameter and length

Force requirement: Calculate with safety factor

Stroke length: Verify mechanical clearance

Environment: Choose IP rating (IP54 standard, IP65+ for harsh environments)

Lifecycle: Specify expected cycles (1M, 5M, 10M+)

6. Bistable Solenoids (Latching Solenoids)

Overview

Here’s one of my personal favorites: bistable solenoids, also called latching solenoids. The magic here is that they have two stable positions, and they stay put in whichever one you last set them to — without consuming any power. Think of it like a mechanical memory. You pulse it one way, it clicks into position A. Pulse it the other way, it snaps to position B. Then it just… waits there. No current needed.

Working Principle

The secret is a permanent magnet inside. That magnet holds the plunger in place at both ends of its travel. To move it, you send a brief current pulse in one direction to pull it to position A, or reverse the polarity to send it to position B. It’s actually quite elegant, and the power savings can be substantial in battery-powered applications.

Key Features

✅ Zero holding power – Energy saving

✅ Fail-safe options – Spring return or magnetic hold

✅ Low heat generation – Only powered during switching

✅ Battery operation suitable – Ideal for portable devices

Applications

Smart Locks

– Hotel door locks – Battery-powered, long battery life

– Residential smart locks – Fail-secure or fail-safe options

– Locker locks – Gym, school, parcel locker

Fluid Control

– Water valves – Irrigation, faucets

– Gas valves – Safety shutoff

– HVAC dampers – Zone control

Safety Systems

– Emergency stop mechanisms – Fail-safe latching

– Fire safety dampers – Normally open/closed options

– Security gates – Battery backup operation

Pulse Drive Circuit

Bistable solenoids need a slightly different driving approach. Here’s what you need to know:

1. Pulse width: 50-200ms typical

2. Polarity: Reverse polarity for opposite direction

3. Peak current: 2-3x holding current for fast actuation

4. Protection: Flyback diode essential

Example drive circuit:

“`

Microcontroller → MOSFET driver → Solenoid coil

↓

Flyback diode

↓

Current sense (optional)

“`

7. Open Frame Solenoids

Overview

As the name suggests, open frame solenoids leave the coil winding exposed — no sealed housing here. This isn’t a flaw; it’s actually a feature for the right applications. Without a housing trapping heat, these things stay cooler and cost less to make.

Key Features

✅ Low cost – Simple construction

✅ Good heat dissipation – Open design

✅ Customizable – Easy to modify coil

✅ Lightweight – No heavy housing

Applications

General Industrial Equipment

– Office equipment – Printers, copiers, scanners

– Vending machines – Product delivery, coin mechanisms

– Amusement equipment – Pinball, arcade games

Cost-Sensitive Applications

– Toys – Low-cost actuation

– Educational kits – Science experiments

– Prototyping – Easy to modify and test

Limitations

⚠️ No environmental protection – Indoor use only

⚠️ Dust accumulation – Can affect performance

⚠️ Limited lifecycle – 1-5 million cycles typical

8. Specialty Solenoids

8.1 Sucker Solenoids (Electromagnetic Suction Cups)

Overview

Sucker solenoids are built to stick to things — specifically ferromagnetic materials. The idea is simple: generate a strong magnetic field that pulls the “suction cup” against a metal surface and holds it there. They’re great for lifting steel sheets, positioning parts, or anything where you need a quick temporary grip.

Applications

– Material handling – Steel sheet lifting

– Automation – Parts positioning and holding

– Robotics – End-effector grippers

Selection Parameters

– Suction force: 5N to 500N+

– Power consumption: DC 6V-24V

– Duty cycle: Continuous or intermittent

8.2 Lamp Solenoids

Overview

These are solenoids purpose-built for lighting systems — moving headlamps, adjusting stage lights, that sort of thing. They handle the repetitive positioning demands that come with lighting control without missing a beat.

Applications

– Stage lighting – Moving head control

– Automotive lighting – Headlamp leveling

– Industrial lighting – Position adjustment

8.3 Automotive Solenoids

Overview

Car environments are brutal: vibration, temperature swings, oil splashing around, road salt, and more. Automotive solenoids are engineered to take all of that abuse and keep working. The specifications for these are noticeably tougher than you’d find in most other industries.

Key Features

✅ Shock resistant – Withstand 10G+ vibration

✅ High temperature – Operate up to 125°C

✅ Oil and chemical resistant – Encapsulated construction

✅ EMI shielded – Don’t interfere with electronics

Applications

– Fuel injectors – Precise fuel metering

– EGR valves – Emission control

– Transmission control – Shift actuation

– Door locks – Central locking systems

– Starter solenoids – High-current switching

9. Solenoid Valves

Overview

A solenoid valve is basically a solenoid married to a valve body. The solenoid does the actuating, and the valve controls whether fluid (liquid or gas) gets through. Together, they let you start and stop fluid flow with nothing more than an electrical signal. It’s one of those combinations that seems obvious in hindsight but opened up huge possibilities in process control.

Types of Solenoid Valves

9.1 Direct-Acting Valves

With direct-acting valves, the solenoid does all the heavy lifting — it opens and closes the orifice directly. These work well for smaller flow rates and pressures, and they have a couple of real advantages: they’re fast (under 20ms in many cases) and they’ll work even when there’s zero pressure differential across the valve.

Advantages:

Fast response (< 20ms)

Works from 0 bar pressure

Simple design

Limitations:

Limited to small orifice sizes (typically ≤ 6mm)

Higher power consumption for larger sizes

9.2 Pilot-Operated Valves

Pilot-operated valves are smarter about energy use. They use the pressure of the fluid itself to help move the valve, which means the solenoid only needs to crack it open initially. The tradeoff is that they need at least some minimum pressure differential (usually around 0.5 bar) to work properly, and they’re not quite as snappy.

Advantages:

Can control large flows with small solenoid

Lower power consumption

Limitations:

Requires minimum differential pressure (typically 0.5 bar)

Slower response

9.3 Normally Closed (NC) vs. Normally Open (NO)

Normally Closed (NC):

Valve closed when de-energized

Opens when energized

Fail-safe for most applications

Normally Open (NO):

Valve open when de-energized

Closes when energized

Fail-safe for cooling water, fire suppression

Valve Body Materials

| Material | Applications | Temperature Range |

|———-|————–|——————-|

| Brass | Water, air, inert gases | -10°C to 80°C |

| Stainless Steel 304/316 | Corrosive fluids, food, medical | -20°C to 150°C |

| Plastic (PVC, PP, PTFE) | Chemicals, acids | 0°C to 60°C |

| Aluminum | Air, inert gases | -20°C to 100°C |

Seal Materials

| Material | Applications | Temperature Range |

|———-|————–|——————-|

| NBR (Buna-N) | Water, air, oil | -20°C to 80°C |

| EPDM | Hot water, steam, chemicals | -30°C to 120°C |

| Viton (FKM) | Oil, fuel, high temp | -20°C to 150°C |

| PTFE (Teflon) | Chemicals, food, medical | -100°C to 200°C |

| Silicone | Food, medical, high temp | -50°C to 200°C |

Flow Calculation

Flow coefficient (Kv or Cv):

Q = Kv × √(ΔP / ρ)

Where:

Q = Flow rate (m³/h)

Kv = Flow coefficient (m³/h per bar)

ΔP = Pressure drop (bar)

ρ = Fluid density (kg/m³)

Example:

Required flow: 500 L/min = 30 m³/h

Pressure drop: 2 bar

Fluid: Water (ρ = 1000 kg/m³)

Kv = Q / √(ΔP / ρ) = 30 / √(2 / 1000) = 30 / 0.0447 = 670

Select valve with Kv ≥ 670 (or Cv ≥ 780 GPM)

10. Technical Specifications and Parameters

10.1 Electrical Specifications

Voltage Ratings

DC (Direct Current):

Low voltage: 3V, 5V, 6V, 9V, 12V, 24V

Standard: 12V, 24V (most common)

High voltage: 48V, 60V, 110V

AC (Alternating Current):

Low voltage: 12V, 24V, 48V

Standard: 110V, 120V, 220V, 240V

High voltage: 380V, 480V

Selection tip: DC solenoids tend to behave more consistently across different temperatures. AC solenoids have the edge in simplicity if you’re wiring into an industrial AC supply — no rectifier needed.

Coil Resistance

R = V / I

Where:

R = Resistance (Ω)

V = Rated voltage (V)

I = Rated current (A)

Example: 12V DC solenoid, 1.5A current

R = 12V / 1.5A = 8Ω

Power Consumption

P = V × I = I² × R

Where:

P = Power (Watts)

Example: 12V, 1.5A solenoid

P = 12V × 1.5A = 18W

Insulation Class

| Class | Max Temperature |

|——-|—————-|

| A | 105°C |

| B | 130°C |

| F | 155°C |

| H | 180°C |

| N | 200°C |

Selection: Pick an insulation class that leaves enough headroom — your ambient temperature plus the coil’s own heating should comfortably stay below the class limit.

10.2 Mechanical Specifications

Force-Stroke Curve

This is one of those relationships that catches people off guard: as the plunger moves further out (increasing stroke), the force drops — and it drops fairly quickly. Here’s what that curve typically looks like:

“`

Force (N)

F_max |\

| \

| \______

|_________________ Stroke (mm)

S_max

“`

Duty cycle impact: Continuous duty solenoids have 20-30% lower force than intermittent duty (due to larger coil for heat dissipation).

Response Time

Pull-in time: Time from power application to plunger reaching 90% of stroke

Release time: Time from power removal to plunger returning 90% of stroke

Factors affecting response time:

Voltage (higher = faster)

Load (heavier = slower)

Spring force (stronger = slower release)

Temperature (affects coil resistance)

Lifecycle

Mechanical life: Number of cycles before mechanical failure

Electrical life: Number of cycles before coil failure

Typical values:

Consumer grade: 100k – 1M cycles

Industrial grade: 1M – 10M cycles

High-end: 10M – 100M cycles

Ways to extend life:

Reduce duty cycle

Use proper voltage (not overvoltage)

Ensure proper alignment

Regular lubrication (if accessible)

Clean environment (or use IP65+ rating)

11. How to Select the Right Solenoid

Step-by-Step Selection Process

Step 1: Define the Application

Questions to answer:

What motion is needed? (linear, rotary, hold)

What force/torque is required?

What is the stroke/angle?

How fast must it operate?

How often will it cycle?

Step 2: Determine Operating Conditions

Environmental factors:

Ambient temperature range

Humidity / moisture exposure

Dust / dirt exposure

Chemical exposure

Shock and vibration

Altitude

Electrical factors:

Available voltage (DC or AC)

Voltage tolerance (±10%? ±20%?)

Power budget (battery or mains)

EMI/EMC requirements

Step 3: Calculate Force Requirement

Include safety factors:

Static load: 1.5x – 2x safety factor

Dynamic load: 2x – 3x safety factor

Shock load: 3x – 5x safety factor

Example:

Application requires 10N holding force

With 2x safety factor: Select solenoid with ≥ 20N force

Step 4: Select Solenoid Type

Use decision tree:

“`

Need linear motion?

├─ YES → Push-pull solenoid

│ ├─ Need compact size? → Tubular solenoid

│ ├─ Need energy saving? → Bistable solenoid

│ └─ Cost sensitive? → Open frame solenoid

├─ NO → Need rotary motion?

├─ YES → Rotary solenoid

└─ NO → Need fluid control?

└─ YES → Solenoid valve

“`

Step 5: Verify Specifications

Check these parameters against requirements:

Force at required stroke

Voltage and current

Duty cycle

Response time

Lifecycle

IP rating

Operating temperature

Mounting dimensions

Certification (UL, CE, RoHS, REACH)

Step 6: Request Samples

Always test before production:

Order 2-3 samples

Test in actual application

Measure actual force, response time, temperature rise

Verify lifecycle in your conditions

Step 7: Finalize Specifications

After testing, you may need to adjust:

Force rating (higher or lower)

Duty cycle (if overheating)

Voltage (for different power supply)

Stroke length (if mechanical interference)

12. Solenoid Calculation Formulas

12.1 Force Calculation

Approximate force formula:

F = (N × I)² × μ₀ × A / (2 × g²)

Where:

F = Force (N)

N = Number of turns

I = Current (A)

μ₀ = 4π × 10⁻⁷ H/m

A = Plunger cross-section area (m²)

g = Air gap (m)

Note: This gives you a ballpark figure. Real-world force depends on things like magnetic saturation and exact circuit design. Always cross-reference with the manufacturer’s force-stroke curve — it’s the closest thing to ground truth you’ll get.

12.2 Temperature Rise Calculation

ΔT = P × Rth

Where:

ΔT = Temperature rise (°C)

P = Power dissipation (W)

Rth = Thermal resistance (°C/W)

Thermal resistance examples:

Small solenoid: 10-20°C/W

Medium solenoid: 5-10°C/W

Large solenoid: 2-5°C/W

Example:

10W power, Rth = 8°C/W

ΔT = 10W × 8°C/W = 80°C

If ambient = 25°C, coil temperature = 105°C (Class B limit)

12.3 Duty Cycle Calculation

Duty Cycle (%) = (Energized time / Total cycle time) × 100

Example:

Energized for 2 seconds, off for 8 seconds

Cycle time = 10 seconds

Duty cycle = (2s / 10s) × 100 = 20%

Continuous duty: 100% (always on)

Intermittent duty: < 100% (periodic on/off)

12.4 Response Time Estimation

Pull-in time (approximate):

t = (m × v) / F

Where:

t = Time (s)

m = Moving mass (kg)

v = Final velocity (m/s)

F = Force (N)

Example:

Mass = 10g = 0.01kg

Velocity = 0.2 m/s

Force = 20N

t = (0.01 × 0.2) / 20 = 0.0001s = 0.1ms (theoretically)

Actual: 10-30ms due to inductance, friction, etc.

13. Installation and Wiring Guide

13.1 Mechanical Installation

Mounting Considerations

A few things that’ll save you headaches later:

✅ Rigid mounting – Prevent vibration that can loosen connections

✅ Proper alignment – Plunger must move freely without side load

✅ Adequate clearance – Allow for full stroke plus margin

✅ Accessible wiring – Easy to connect and maintain

✅ Thermal management – Allow airflow for heat dissipation

Mounting Styles

Flange mount:

Most common

2-4 mounting holes

Good for high-force applications

Threaded body:

Compact

Easy to adjust position

Lower cost

Foot mount:

Low profile

Good for space-constrained installations

DIN rail mount:

Standard for industrial control panels

Easy to install and replace

13.2 Electrical Wiring

Wiring Methods

Lead wires:

Standard: 150mm – 300mm

Gauge: 22-18 AWG (depending on current)

Insulation: PVC, Teflon (high temp)

Connectors:

Faston terminals (blade connectors)

Molex connectors

DIN connectors

Custom connectors

Wiring Diagram – DC Solenoid

“`

Power Supply (+) ────→ Solenoid Coil (+) ────→ Flyback Diode (cathode)

│

Power Supply (─) ────→ Solenoid Coil (─) ────→ Flyback Diode (anode)

“`

⚠️ Important: Always use a flyback diode (DC) or RC snubber (AC) to protect the driving circuit from voltage spikes when the solenoid turns off. This isn’t optional — skip it and you’ll fry your transistor or whatever’s driving the coil.

Wiring Diagram – AC Solenoid

“`

Power Supply (L) ────→ Solenoid Coil ────→ RC Snubber ────→ Power Supply (N)

“`

Flyback Diode Selection

Diode specifications:

Reverse voltage: ≥ 2× supply voltage

Current rating: ≥ solenoid current

Switching speed: Fast recovery (optional but better)

Example:

12V DC solenoid, 2A current

Select diode: 1N4004 (400V, 1A) – marginal

Better choice: 1N5404 (400V, 3A) or SB260 (60V, 2A Schottky)

13.3 Drive Circuits

Simple DC Drive

“`

Microcontroller GPIO ──→ Resistor (1kΩ) ──→ N-MOSFET Gate

│

MOSFET Source ──→ GND

MOSFET Drain ──→ Solenoid (–)

│

Solenoid (+) ──→ +12V

“`

PWM Speed Control

Some solenoids allow PWM control for variable force:

Frequency: 200Hz – 20kHz

Duty cycle: 10% – 90%

– Note: Not all solenoids are suitable for PWM. Check with manufacturer.

Current-Limited Drive

For high-inrush current solenoids, use current limiting:

Active current limit (adjustable)

Soft-start circuit (gradual voltage ramp)

Pulse-width modulation (limit average current)

14. Maintenance and Troubleshooting

14.1 Preventive Maintenance

Regular Inspection Schedule

Monthly:

Visual inspection for damage

Check mounting tightness

Listen for unusual noise

Quarterly:

Measure coil resistance

Check response time

Inspect wiring and connections

Annually:

Full functional test

Measure force output

Check temperature rise

Replace if near end-of-life

Lubrication

3. Bent plunger (side load)

4. Corrosion (moisture)

5. Wrong clearance (too tight)

Diagnostic steps:

1. Clean plunger and guide

2. Lubricate

3. Check for side load (may need realignment)

4. Check for rust (may need replacement)

5. Verify mechanical design

15. Industry Applications in Detail

15.1 Home Appliances

Washing Machines

Applications:

Door lock solenoid (safety interlock)

Detergent dispenser solenoid

Water inlet valve solenoid

Drain valve solenoid

Requirements:

Low cost

Reliable (10+ years life)

Quiet operation

Water resistant (IPX4+)

Typical specs:

Voltage: AC 120V/220V or DC 12V/24V

Force: 10-30N

Lifecycle: 5,000 – 10,000 cycles (per year)

16. Quality Standards and Certifications

16.1 International Standards

ISO 9001:2015 – Quality Management Systems

ISO 9001 is probably the most recognized quality standard in the world. It ensures that a company has documented processes, does regular audits, and maintains traceability from raw materials to finished product. For solenoids, it means you can have some confidence that what you order today will match what you order a year from now.

What to look for:

Supplier has ISO 9001 certification

Regular audits and reviews

Documented quality procedures

Traceability of materials and components

ISO 14001 – Environmental Management

ISO 14001 shows that a manufacturer takes its environmental responsibilities seriously — waste management, emissions, that sort of thing. It’s becoming more important as major companies tighten their supply chain requirements.

IEC 60529 – IP Rating (Ingress Protection)

The IP rating system tells you how well a solenoid is protected against solid objects and liquids. This one matters a lot in real-world applications.

Common ratings:

IP40: Indoor use, dust protected

IP54: Dust protected, splash proof

IP65: Dust tight, water jet proof

IP67: Dust tight, immersion proof (1m, 30min)

IP68: Dust tight, continuous immersion

ISO 13849 – Machine Safety

If your solenoid is going into a safety-related control system (say, an emergency stop), ISO 13849 is what defines the required reliability level. Performance Level (PL) a through e — higher letters mean more rigorous testing and redundancy.

16.2 Product Certifications

UL (Underwriters Laboratories)

UL is the big name in North American safety certification. If you want to sell anything in the US or Canada, UL listing is often expected (or required).

Common UL standards for solenoids:

UL 1004: Motors and solenoids

UL 499: Electric heating appliances

UL 873: Temperature indicating and regulating equipment

CE Marking

CE marking is Europe’s answer to product safety — you can’t legally sell most electrical equipment in the EEA without it.

Directives that may apply:

Low Voltage Directive (LVD) 2014/35/EU

Electromagnetic Compatibility (EMC) Directive 2014/30/EU

RoHS Directive 2011/65/EU

RoHS (Restriction of Hazardous Substances)

RoHS limits what’s allowed in electrical and electronic products. It’s become a global standard, not just a European one.

Restricted substances:

Lead (Pb) < 0.1%

Mercury (Hg) < 0.1%

Cadmium (Cd) < 0.01%

Hexavalent chromium (Cr6+) < 0.1%

PBB < 0.1%

PBDE < 0.1%

REACH

REACH is an EU regulation focused on chemicals. It requires companies to register and manage the safety of substances they use — more relevant for material selection than you’d think.

NSF/ANSI 61

Required for: Solenoids in contact with drinking water.

NSF/ANSI 61 tests that components don’t leach harmful chemicals into drinking water. If your solenoid will sit in a water line, this certification isn’t optional — it’s the law in most jurisdictions.

16.3 Testing and Validation

Type Testing

Tests performed on prototype:

Force-stroke measurement

Response time measurement

Temperature rise test

Insulation resistance test

Dielectric strength test (hi-pot)

Lifecycle test (endurance)

Environmental test (temperature, humidity)

Vibration test

Shock test

Production Testing

Tests performed on every unit:

Coil resistance check

Visual inspection

Functional test (actuation check)

Hi-pot test (optional, destructive)

Leak test (for sealed units)

17. Custom Solenoid Design Process

17.1 When to Consider Custom Design

Reasons to go custom:

Standard solenoid doesn’t meet requirements

Unique form factor needed

Cost reduction (high volume)

Performance optimization

Patent or IP considerations

17.2 Design Process Steps

Step 1: Requirement Definition

Collect detailed specs:

Force at stroke (force-stroke curve)

Voltage and current

Duty cycle

Response time

Lifecycle requirement

Operating temperature

Environmental conditions (IP rating)

Mounting constraints

Cost target

Volume (annual usage)

Step 2: Concept Design

Engineer creates initial design:

Magnetic circuit design (FEM analysis)

Coil design (wire size, turns, resistance)

Mechanical design (plunger, spring, housing)

Thermal design (heat dissipation)

Deliverables:

3D model (STEP file)

2D drawings (PDF, DWG)

Specifications sheet

Cost estimate

Step 3: Prototype Fabrication

Build 5-10 prototypes:

Manual winding or small batch winding

Machined parts (CNC)

Assembly and testing

Testing:

Verify force-stroke curve

Measure response time

Check temperature rise

Perform lifecycle test (accelerated)

Step 4: Design Review and Revision

Evaluate prototype test results:

Does it meet specs?

Any issues or failures?

Can cost be reduced?

Can performance be improved?

Revise design if needed:

Change wire size (adjust resistance)

Change spring force

Modify plunger shape

Improve thermal path

Step 5: Pre-Production Samples

Build 50-100 units:

Production tooling (if needed)

Production process validation

Operator training

Testing:

100% functional test

Sample reliability test (accelerated lifecycle)

Step 6: Production Release

Full production:

Quality control plan

In-process inspection

Final test procedure

Packaging and shipping

17.3 Custom Design Timeline

Typical timeline:

Requirement definition: 1 week

Concept design: 2-3 weeks

Prototype fabrication: 2-3 weeks

Prototype testing: 1-2 weeks

Design revision (if needed): 1-2 weeks

Pre-production samples: 3-4 weeks

Production release: 2-4 weeks

Total: 12-22 weeks (3-5 months)

17.4 Custom Design Cost

Cost components:

Engineering (design, analysis): $2,000 – $10,000

Tooling (molds, fixtures): $1,000 – $20,000

Prototypes (material, labor): $500 – $5,000

Testing (equipment, labor): $500 – $3,000

Total NRE (Non-Recurring Engineering): $5,000 – $40,000

When custom makes sense:

Annual volume > 5,000 pcs (spread NRE cost)

Standard product price > $10 (cost reduction potential)

Unique requirement that can’t be met by standard

18. Cost Factors and Pricing

18.1 Cost Components

Material Cost (40-60% of total)

Major materials:

Copper wire (coil): 20-30%

Steel (housing, plunger): 10-20%

Plastic (bobbin, housing): 5-10%

Spring: 2-5%

Lead wires and terminals: 3-5%

Labor Cost (20-40% of total)

Manufacturing processes:

Coil winding: Manual or automated

Assembly: Manual or automated

Testing: Manual or automated

Packaging: Manual

Labor cost by region:

China: $3-8/hour

Vietnam/India: $2-5/hour

Mexico: $4-10/hour

USA/Europe: $15-40/hour

Overhead (10-20% of total)

Factory rent

Utilities

Equipment depreciation

Quality control

Management and administration

Shipping and Logistics (5-15% of total)

Ocean freight: $0.5-2/kg

Air freight: $5-15/kg

Customs duties: 0-10% (depending on country)

Local delivery: $0.1-0.5/unit

18.2 Pricing Examples

Consumer Grade Solenoids

Tubular solenoid, DC 12V, 10N, 5mm stroke:

Volume: 10,000 pcs/year

China factory price: $1.50 – $2.50

USA resale price: $8 – $15

Industrial Grade Solenoids

Push-pull solenoid, DC 24V, 50N, 10mm stroke, IP65:

Volume: 1,000 pcs/year

China factory price: $8 – $15

USA resale price: $40 – $80

High-End Solenoids

Rotary solenoid, DC 12V, 0.5 Nm, 90°, medical grade:

Volume: 500 pcs/year

China factory price: $25 – $50

USA resale price: $150 – $300

18.3 Cost Reduction Strategies

Design for Manufacturability (DFM)

Simplify design (fewer parts)

Use standard components

Design for automated assembly

Minimize tolerances (where possible)

Value Engineering

Substitute materials (e.g., aluminum for steel if strength allows)

Optimize coil design (reduce copper use)

Eliminate non-critical features

Volume Leverage

Consolidate purchases (single supplier)

Long-term contract (volume commitment)

Annual blanket order (schedule releases)

Geographic Strategy

Near-shoring (Mexico for USA, Eastern Europe for Western Europe)

Multi-sourcing (qualify 2-3 suppliers)

Local warehousing (reduce shipping costs and lead time)

19. Supplier Selection Criteria

19.1 Supplier Evaluation Checklist

Technical Capability

[ ] Can they meet your specs?

[ ] Do they have in-house design engineering?

[ ] Do they have testing equipment (force, life, environment)?

[ ] Can they provide custom design?

[ ] Do they have patent or IP issues?

Quality System

[ ] ISO 9001 certified?

[ ] In-process quality control?

[ ] Final test procedure?

[ ] Traceability (material batch, production date)?

[ ] Corrective action process (for complaints)?

Production Capacity

[ ] Can they meet your volume?

[ ] Lead time (from order to shipment)?

[ ] Flexibility (can handle rush orders)?

[ ] Backup capacity (if demand spikes)?

Financial Stability

[ ] How long in business?

[ ] Financial health (profitability, cash flow)?

[ ] Bankruptcy risk?

Communication and Service

[ ] English speaking (or your language)?

[ ] Responsive to inquiries (within 24 hours)?

[ ] Provide samples quickly?

[ ] Willing to support custom design?

[ ] Provide technical support (not just sales)?

Location and Logistics

[ ] Shipping time to your location?

[ ] Shipping cost?

[ ] Customs and import expertise?

[ ] Local warehouse or distributor?

19.2 Red Flags

⚠️ Avoid suppliers who:

Can’t provide test reports or certifications

Have frequent quality complaints

Don’t respond to emails promptly

Pressure you to order before you’re ready

Can’t provide references from similar customers

Have very low prices (may indicate quality issues)

Don’t have proper manufacturing equipment (just trading company)

19.3 Sample Evaluation

Before placing production order, always evaluate samples:

Visual inspection:

Build quality (neat winding, clean assembly)

Labeling (clear part number, specs)

Packaging (protected against shipping damage)

Dimensional check:

Measure critical dimensions

Check mounting hole pattern

Verify plunger stroke and freedom of movement

Performance test:

Measure force at rated voltage

Measure response time

Check temperature rise (after 30 min operation)

Listen for noise (abnormal sounds)

Lifecycle test (if possible):

Run solenoid for 10,000-100,000 cycles

Check force degradation

Check for mechanical wear

20. Future Trends in Solenoid Technology

20.1 Miniaturization

Trend: Smaller solenoids for portable and wearable devices.

The march toward smaller, lighter electronics is pushing solenoid manufacturers to pack more performance into increasingly tiny packages. IoT sensors, wearable health monitors, and micro-robots all need actuators — and solenoids are getting the shrink treatment.

Drivers:

IoT devices

Wearable electronics

Medical implants

Micro-robotics

Challenges:

Maintaining force in smaller size

Heat dissipation (smaller = less surface area)

Manufacturing precision (tight tolerances)

20.2 Smart Solenoids

Trend: Integrated sensors and electronics.

Why just actuate when you can also monitor? The next generation of solenoids will increasingly include built-in position sensors, current monitoring, temperature sensing, and even wireless communication. This is where Industry 4.0 is taking us — machines that can tell you when they’re about to fail, not just after they already have.

Features:

Position sensing (Hall effect, Reed switch)

Current sensing (monitor coil health)

Temperature sensing (prevent overheating)

Communication (I2C, RS485, wireless)

Benefits:

Predictive maintenance (detect wear before failure)

Remote monitoring (Industry 4.0)

Self-diagnostics (troubleshoot without disassembly)

20.3 Energy Efficiency

Trend: Lower power consumption.

Battery-powered everything is the name of the game, and solenoids are following suit. Lower voltage operation (5V, 3.3V for coin-cell or small LiPo applications), latching designs, and smarter drive electronics are all contributing to serious power reductions.

Techniques:

Optimized magnetic circuit (FEM analysis)

Latching (bistable) design

Lower voltage operation (5V, 3.3V for battery devices)

PWM control (reduce average power)

Drivers:

Battery-powered devices (longer battery life)

Green initiatives (reduce energy consumption)

Heat reduction (less cooling needed)

20.4 New Materials

Trend: Advanced materials for better performance.

Neodymium magnets are already making latching solenoids more efficient. Looking further out, high-temperature superconductors could theoretically eliminate resistive losses entirely — though that’s still more science fiction than engineering reality. Additive manufacturing (3D printing) is starting to enable complex geometries that simply weren’t possible with traditional machining.

Examples:

High-energy permanent magnets (Neodymium) for latching solenoids

High-temperature superconductors (future possibility)

Composite materials (lighter, stronger)

Additive manufacturing (3D printing) for complex shapes

20.5 Integration with Motors

Trend: Hybrid devices (solenoid + motor).

The best of both worlds: solenoids for quick, binary motion, and motors for precise continuous positioning. Think of a camera’s autofocus mechanism — it needs to snap into position fast, then fine-tune with sub-millimeter accuracy. Neither a solenoid nor a motor alone does that job as well as the two of them working together.

Examples:

Solenoid for fast actuation + motor for precise positioning

Used in: Robotic grippers, camera autofocus, medical devices

21. FAQ – Frequently Asked Questions

Q1: What’s the difference between a solenoid and a relay?

A: A solenoid converts electrical energy into mechanical motion. A relay uses a solenoid to flip electrical contacts — it’s essentially a switch controlled by a solenoid. The solenoid does the work, but the relay’s job is switching power to something else.

Q2: Can I run a 12V DC solenoid on 24V?

A: I really wouldn’t recommend it. Your solenoid will run hot — way hotter than it’s designed for — and you’ll burn it out in short order. If voltage conversion is unavoidable, keep duty cycle below 5% and watch the temperature like a hawk. A DC-DC converter or a simple resistor is a much better plan.

Q3: How long do solenoids last?

A: It depends heavily on how hard you’re working them. A cheap consumer-grade solenoid might give you 100,000 to a million cycles before it calls it quits. Industrial-grade units can handle 1M to 10M cycles. The really high-end ones? We’re talking 10M to 100M cycles. Duty cycle, voltage, ambient temperature, and mechanical load all play a role in lifespan.

Q4: Can solenoids be repaired?

A: Technically yes, but economically? Almost never. A burned-out coil means rewinding by hand — labor costs will usually exceed the price of a new solenoid. Mechanical wear requires disassembly and sourcing replacement parts. Just replace it.

Q5: What does “ED 25%” mean?

A: “ED” comes from the German term “Einschaltdauer,” which means duty cycle. ED 25% tells you the solenoid can be energized for 25% of any given cycle — say, 2.5 minutes on and 7.5 minutes off in a 10-minute cycle. Go over that and you’ll be dealing with overheating problems.

Q6: Can I use a solenoid in both AC and DC?

A: Nope. AC and DC solenoids have fundamentally different coil designs. Trying to run DC through an AC solenoid might give you some weak motion, but running AC through a DC solenoid will destroy the coil almost instantly — DC windings have very little resistance, so the current will surge beyond anything they were built to handle.

Q7: How do I make a solenoid stronger?

A: You’ve got a few levers to pull: increase the current (more voltage or more wire turns), use magnetic materials with higher permeability, reduce the air gap, or just step up to a physically larger solenoid. The air gap is usually the most impactful — even a tiny increase in gap can dramatically reduce force.

Q8: What’s the typical response time?

A: Most solenoids land somewhere between 10 and 50 milliseconds for pull-in. Specialty high-speed versions can get under 5ms, while large industrial units or anything with significant inertial load will be slower.

Q9: Can solenoids be used underwater?

A: Absolutely — if they’re properly rated for it. Look for IP67 or IP68, with an epoxy-sealed coil and stainless steel construction. A solenoid that’s not designed for wet environments will corrode and fail quickly underwater.

Q10: How do I reduce solenoid noise?

A: A few things can help. Rubber dampening pads absorb the impact shock. If your application can handle it, dropping the voltage a bit reduces the “thunk.” Check that mounting screws are tight — loose mounting amplifies everything. And if noise is really critical, consider a rotary solenoid instead — they operate much more smoothly since there’s no hard stop impact.

Q11: What wire gauge should I use to connect the solenoid?

A: As a rule of thumb: 22 AWG for currents under 1 amp, 18 AWG for 1-3 amps, 14 AWG for 3-10 amps. One thing many people overlook — if you’re running long wire lengths, bump up to a heavier gauge to compensate for voltage drop along the run.

Q12: Can I control solenoid speed?

A: Not in the traditional sense. Solenoids are fundamentally on/off devices &#8212 you give them power, they pull in; you cut power, they release. If you need variable speed or force, look into proportional solenoids (a more sophisticated design) or PWM control — though not every solenoid tolerates PWM, so check with the manufacturer first.

Q13: What’s a proportional solenoid?

A: Think of it as a solenoid with a brain. Instead of just full-on or full-off, the force it produces scales with the current you feed it. This lets you dial in exactly the right amount of push — useful in things like fuel injectors and pressure control valves where precision matters.

Q14: How do I mount a solenoid?

A: Most commonly, you’ll use the mounting holes on the flange (flange mount). Threaded body solenoids screw directly into a hole. Foot mounts use a bracket. The key rules: mount it rigidly so it doesn’t vibrate loose, and make sure the plunger is properly aligned so it doesn’t bind up during operation.

Q15: Can solenoids be used in explosive atmospheres?

A: They can, but only if they’re specifically rated as explosion-proof (ATEX or IECEx certification). These units have heavy-duty housings designed to contain any spark or explosion inside, keeping the surrounding atmosphere safe. Don’t even think about putting a standard solenoid in a classified hazardous area.

22. Case Studies

Case Study 1: Smart Lock Actuator

Customer: Smart lock manufacturer

Application: Residential smart lock

Requirement:

Force: 15N at 8mm stroke

Voltage: DC 12V (battery powered)

Lifecycle: 100,000 cycles

Low power consumption

Solution:

Bistable (latching) solenoid

Force: 20N (safety factor 1.5x)

Stroke: 10mm

Pulse drive: 50ms pulse, < 1W average power

Lifecycle tested: 200,000 cycles

Result:

Battery life: 2+ years (4 AA batteries)

Reliable operation (> 99.9% success rate)

Cost: $3.50/unit (volume 50,000 pcs/year)

Case Study 2: Medical Infusion Pump Valve

Customer: Medical device company

Application: Infusion pump fluid control

Requirement:

Biocompatible materials (ISO 10993)

Sterilizable (ethylene oxide or gamma)

Precise flow control

Fail-safe (close on power loss)

Solution:

Normally closed (NC) solenoid valve

2-way, 1.5mm orifice

EPDM seals (medical grade)

316 stainless steel body

24V DC, ED 100% (continuous duty)

Result:

Passed all biocompatibility tests

Sterilization compatible (50+ cycles)

Flow accuracy: ±2%

FDA 510(k) cleared

Case Study 3: Industrial Conveyor Diverter

Customer: Logistics automation company

Application: Package sortation system

Requirement:

High force: 80N at 15mm stroke

Fast response: < 30ms

Long life: 10M cycles

24/7 operation

Solution:

Push-pull solenoid, industrial grade

Force: 100N (safety factor 1.5x)

Stroke: 20mm

Voltage: DC 24V

Duty cycle: ED 50% (continuous operation with cooling)

IP65 rating (dusty environment)

Result:

Installed 500+ units in sortation system

Uptime: 99.95%

Maintenance interval: 2 years

Cost savings vs. pneumatic actuator: 40% (no air compressor needed)

23. Conclusion

Picking the right solenoid matters more than most people realize — the difference between a well-matched solenoid and a marginal one can be the difference between a machine that runs for years and one that’s constantly in the repair shop. This guide has walked through the main types, how they work, where they’re used, and what to look for when you’re spec’ing one out.

Key Takeaways

1. Understand your application – Get crystal clear on force, stroke, voltage, duty cycle, and environment before you start shopping.

2. Choose the right type – Linear motion needs a push-pull; angular motion needs a rotary; tight spaces call for tubular; battery-powered devices should consider bistable.

3. Verify specifications – Never rely on a datasheet alone. Check the force-stroke curve, response time specs, lifecycle rating, and duty cycle — and then test a sample.

4. Test before production – Get 2-3 samples and run them in your actual application. Datasheets don’t lie, but they don’t tell the whole story either.

5. Consider total cost – The purchase price is just the beginning. Factor in energy consumption, maintenance, and replacement costs over the product’s lifetime.

6. Work with a reputable supplier – When something goes wrong, you want a partner who’ll help you fix it, not a vendor who stops answering emails.

Next Steps

– Evaluate your application using the selection checklist in Section 11

– Contact solenoid manufacturers with your requirements

– Request samples for testing and validation

– Plan for production (volume, lead time, quality control)

Resources

– Standards organizations: ISO, IEC, UL, CE

– Industry associations: [Relevant industry associations]

– Online calculators: [Solenoid force calculators]

– Supplier directories: [Solenoid supplier listings]

About the Author

This guide was created by Cixin Industrial’s engineering team. With 10+ years of experience in solenoid design and manufacturing, we’ve helped over a thousand customers around the world find the right solenoid for their specific applications. We’ve seen what works, what doesn’t, and — perhaps most valuably — what mistakes to avoid.

Contact Us

For technical consultation or custom solenoid design:

Email: andy800502@gmail.com

Phone/WhatsApp: +86 13925521330

Website: https://cx-solenoid.com

Address: Building 1, 2 Liye Road, Qingxi Town, Dongguan City, Guangdong Province, China

Document Version: 1.0

Last Updated: 2024

Word Count: ~15,000 words

Appendix A: Solenoid Selection Checklist

Copy this checklist when specifying a solenoid for your application:

Application Information

[ ] Application name/description: ___________

[ ] Quantity needed (annual): ___________

[ ] Target cost (each): ___________

Performance Requirements

[ ] Motion type: ☐ Linear ☐ Rotary ☐ Holding

[ ] Force/torque required: ___________ N or Nm

[ ] Stroke/angle: ___________ mm or degrees

[ ] Response time (max): ___________ ms

[ ] Duty cycle: ___________ %

Electrical Specifications

[ ] Voltage: ___________ V (DC or AC)

[ ] Power available: ___________ W

[ ] Tolerance: ± ___________ %

Environmental Conditions

[ ] Operating temperature: ___________ °C to ___________ °C

[ ] Humidity: ___________ % RH

[ ] IP rating required: IP ___________

[ ] Chemical exposure: ___________

[ ] Shock/vibration: ___________

Mechanical Requirements

[ ] Mounting style: ☐ Flange ☐ Threaded ☐ Foot ☐ Other: ___________

[ ] Space constraints (max dimensions): ___________ mm (L) × ___________ mm (W) × ___________ mm (H)

[ ] Weight limit: ___________ g

Lifecycle and Reliability

[ ] Expected lifecycle: ___________ cycles

[ ] Warranty period: ___________ years

[ ] Failure rate requirement: ___________ PPM

Certifications Required

[ ] ☐ UL ☐ CE ☐ RoHS ☐ REACH ☐ NSF ☐ Other: ___________

Attachments

[ ] Mechanical drawing (if available)

[ ] Photos of application

[ ] Similar product currently used (for reference)

Appendix B: Unit Conversions

|———–|———|—————|————|

| Pressure | Bar | PSI | 1 bar = 14.5 PSI |

Appendix C: Solenoid Manufacturers (Reference)

Note: This is not an endorsement. Always evaluate suppliers based on your specific requirements.

Tier 1 (Global Brands)

SMC (Japan)

Festo (Germany)

ASCO (USA)

Danfoss (Denmark)

Tier 2 (Regional Brands)

Cixin Industrial (China) – [Your company]

[Others…]

Tier 3 (Value Brands)

Various Chinese manufacturers

Good for cost-sensitive applications

End of Guide

Thanks for reading all the way through! Hopefully this guide gives you a solid foundation for picking the right solenoid. If you’ve got questions or need help with a custom design, our engineering team is just an email or phone call away.

Disclaimer: This guide is intended as general reference material. For specific applications — especially anything safety-critical or high-value — always consult directly with the solenoid manufacturer. Cixin Industrial can’t accept responsibility for any damages or injuries resulting from the use of information in this guide.