Introduction
IntroductionIn demanding industrial environments, standard push button switches often fail prematurely due to insufficient current capacity, moisture ingress, or mechanical wear. The 20A High Current Metal Push Button Switch series (available in 16mm, 19mm, and 22mm mounting sizes) solves these problems with robust construction, IP67 waterproof protection, and exceptional 20A @ 250VAC current handling.
This comprehensive guide covers everything you need to know about these high-performance switches – from technical specifications and material options to application examples and selection criteria.
What Makes a 20A High Current Metal Push Button Switch Different?
Most standard push button switches are rated for 3A to 5A, making them suitable only for low-current signal switching. A 20A high current switch, however, can directly drive:
Motors and pumps
Contactors and relays
Solenoid valves
Heating elements
Lighting circuits
Power supplies
This direct control capability eliminates the need for external relays or contactors, reducing component count, simplifying wiring, and improving overall system reliability.
Series Overview: 16mm, 19mm & 22mm Options
This switch series is available in three standard mounting hole sizes to accommodate different panel designs and application requirements:
| Mounting Size | Best For | Typical Applications |
|---|---|---|
| 16mm | Compact equipment, space-constrained panels | Portable devices, instrument panels, small machinery |
| 19mm | Industry standard, most common | General industrial control, machine tools, automation |
| 22mm | Heavy equipment, gloved operation | Large machinery, power distribution, outdoor controls |
Key Technical Specifications (Based on SCJ19D1 Series)
Electrical Specifications
| Parameter | Value |
|---|---|
| Rated Heating Current (ith) | 20A @ 250VAC |
| Resistive Loads | 20A @ 250VAC |
| Inductive Loads (AC-15) | 20A @ 110V/250V |
| Inductive Loads (DC-13) | 15A @ 12V/24V |
| Switching Voltage Range | 1.5V ~ 250V AC/DC |
| Contact Resistance | ≤50mΩ (initial) |
| Insulation Resistance | ≥100MΩ @ 500VDC |
| Dielectric Strength | 2500VAC, 20mA for 1 minute |
| Electrical Life | >30,000 cycles (AC-15 / DC-13) |
Mechanical Specifications
| Parameter | Value |
|---|---|
| Button Travel | 3mm total (1.5mm contact stroke) |
| Operating Force | Approximately 2.5 ~ 4N |
| Mechanical Life | 1,000,000+ cycles |
| Terminal Type | Quick-connect: 4.8×0.8mm (switch), 2.8×0.5mm (LED) |
Environmental Specifications
| Parameter | Value |
|---|---|
| Waterproof Rating | IP67 (button end) |
| Operating Temperature | -30°C to +85°C |
| Housing Materials | SUS304 stainless steel / Brass nickel-plated / Aluminum alloy anodized |
| Base Material | Modified nylon PA66 (UL94V-0) |
| Button Material | PC + SUS316 (polycarbonate & stainless steel) |
LED Illumination Options
LED illumination provides clear visual status feedback, enhancing operator safety and equipment monitoring.
| Parameter | Specification |
|---|---|
| Lamp Type | Single color LED |
| LED Current | 2mA ~ 20mA |
| LED Voltage Options | AC/DC: 3.3V, 6V, 9V, 12V, 24V, 36V, 48V, 110V, 220V |
| Available Colors | Red, Green, Yellow, Blue, White |
Illumination Styles
| Code | Style | Description |
|---|---|---|
| Ring only | E | Illuminated ring around button perimeter |
| Ring + Symbol | B / EC | Illuminated ring with power symbol |
| Dot glow | D | Small illuminated dot indicator |
| Overall glow | 0 | Full button surface illumination |
| Custom text | T | Custom engraving with illumination |
Operating Modes: Maintained vs. Momentary
Self-Locking (Maintained)
Operation: Press once to latch ON; press again to release OFF
Visual indication: Button remains depressed when in ON position
Best for: Main power control, mode selection, equipment enable/disable
Example: Machine main power switch
Self-Resetting (Momentary)
Operation: Circuit active only while button is pressed; returns OFF when released
Visual indication: Button returns immediately to original position
Best for: Start buttons, jog functions, horn activation, reset controls
Example: CNC machine cycle start button
Button Head Styles
| Code | Head Style | Description | Best For |
|---|---|---|---|
| P | Flat Head | Low profile, modern appearance | Aesthetic panels, flush mounting |
| G | High-head | Extended height, easier actuation | Gloved operation, quick identification |
| Q | Ball Head | Ergonomic curved surface | Comfortable repeated pressing |
| M | Mushroom Head | Large surface area | Emergency stops, palm operation |
Housing Material Options
| Material | Corrosion Resistance | Mechanical Strength | Best Environment |
|---|---|---|---|
| SUS304 Stainless Steel | Excellent | High | Marine, food processing, outdoor, chemical |
| Brass Nickel-plated | Good | Medium | General industrial, indoor panels |
| Aluminum Alloy Anodized | Good | Medium-High | Lightweight applications, portable equipment |
Dimensional Specifications (19mm Model Reference)
| Dimension | Value (mm) |
|---|---|
| Panel hole diameter | 19.0 ~ 19.2 |
| Mounting thread | M19 × 1 |
| Overall length | 21.9 ±0.1 |
| Panel protrusion | 22 ±0.2 |
| Body length | 24.8 ±0.3 |
| Thread height | 11 ±0.1 |
| Hex nut height | 6.5 ±0.1 |
| Terminal width (switch) | 4.8 × 0.8 |
| Terminal width (LED) | 2.8 × 0.5 |
Note: 16mm and 22mm models have similar proportions with corresponding mounting thread dimensions (M16×1 and M22×1 respectively).
Applications by Industry
Industrial Automation
| Application | Recommended Configuration |
|---|---|
| CNC machine start/stop | 19mm, momentary, green LED |
| Conveyor belt control | 22mm, maintained, ring illumination |
| Coolant pump switch | 19mm, maintained, blue LED |
| Emergency stop | 22mm, mushroom head, maintained |
Heavy Machinery
| Application | Recommended Configuration |
|---|---|
| Crane pendant controls | 22mm, momentary, ball head |
| Lift truck operator panel | 19mm, maintained, ring + symbol |
| Hydraulic power unit | 22mm, maintained, red LED |
Renewable Energy
| Application | Recommended Configuration |
|---|---|
| BESS manual disconnect | 19mm, maintained, red ring |
| PV combiner box | 16mm, maintained, stainless steel |
| EV charger emergency stop | 22mm, maintained, mushroom head |
Food Processing
| Application | Recommended Configuration |
|---|---|
| Washdown equipment start | 19mm, momentary, SUS304 |
| Mixer power control | 22mm, maintained, IP67 rated |
Outdoor Equipment
| Application | Recommended Configuration |
|---|---|
| Kiosk power switch | 16mm, maintained, vandal resistant |
| Marine control panel | 19mm, maintained, stainless steel |
| Security gate control | 22mm, momentary, illuminated |
Why Choose This 20A High Current Series?
| Feature | Benefit |
|---|---|
| 20A @ 250VAC rating | Direct drive of motors, solenoids, and heaters – no external relays needed |
| IP67 waterproof | Withstands washdowns, rain, and temporary immersion |
| -30°C to +85°C operation | Suitable for extreme environments from freezers to desert heat |
| 2500VAC dielectric strength | Safe for high-voltage industrial applications |
| Multiple mounting sizes | 16mm, 19mm, and 22mm options for any panel |
| 3 housing materials | Choose optimal corrosion resistance for your environment |
| 4 button head styles | Flat, high-head, ball, or mushroom |
| LED illumination (3V-220V) | Clear status feedback for any voltage worldwide |
| UL94V-0 flame retardant | Safety compliance for fire protection |
| >30,000 cycle electrical life | Long-term reliability in demanding applications |
Selection Guide: Which Switch is Right for You?
Step 1: Choose Mounting Size
| If you need… | Choose… |
|---|---|
| Compact, space-saving design | 16mm |
| Industry standard, most common | 19mm |
| Heavy equipment, gloved operation | 22mm |
Step 2: Choose Operating Mode
| If you need… | Choose… |
|---|---|
| ON/OFF with position retention | Maintained (self-locking) |
| Temporary activation | Momentary (self-resetting) |
Step 3: Choose Housing Material
| Environment | Choose… |
|---|---|
| Marine, food, chemical, outdoor | SUS304 stainless steel |
| General industrial, indoor | Brass nickel-plated |
| Lightweight, aesthetic | Aluminum alloy anodized |
Step 4: Choose Illumination
| If you need… | Choose… |
|---|---|
| Status indication at a glance | Any LED color |
| Power ON confirmation | Green or blue LED |
| Alert / emergency indication | Red LED |
| No illumination needed | Non-illuminated version |
Step 5: Choose Button Head
| If you need… | Choose… |
|---|---|
| Flush, modern appearance | Flat head (P) |
| Easy to find, gloved operation | High-head (G) |
| Comfortable repeated pressing | Ball head (Q) |
| Emergency / large target | Mushroom head (M) |
Installation Guidelines
Panel Preparation
Drill mounting hole to specified diameter:
16mm model: 16.0 ~ 16.2mm
19mm model: 19.0 ~ 19.2mm
22mm model: 22.0 ~ 22.2mm
Mounting Steps
Insert switch from front of panel
Install included rubber O-ring for waterproof seal
Thread hex nut onto bushing from rear
Tighten securely (do not overtighten)
Wiring
Switch terminals: 4.8×0.8mm quick-connect
LED terminals: 2.8×0.5mm quick-connect
Ensure correct polarity for LED (if applicable)
Waterproof Check
Verify O-ring is properly seated
IP67 rating applies only when properly installed
Safety Certifications & Compliance
This switch series is designed to meet international safety standards. Contact the manufacturer for current certification documentation including:
CE (European Conformity)
RoHS (Restriction of Hazardous Substances)
Additional certifications available upon request
Comparison: 20A High Current vs. Standard Push Buttons
| Feature | 20A High Current Series | Standard 3A-5A Switch |
|---|---|---|
| Current rating | 20A @ 250VAC | 3-5A @ 125/250VAC |
| Direct motor control | Yes (up to 1/2 HP) | No (requires contactor) |
| Voltage range | 1.5V ~ 250V AC/DC | Limited to 125/250V AC |
| Dielectric strength | 2500VAC | 1000-1500VAC |
| Temperature range | -30°C to +85°C | -20°C to +55°C |
| LED voltage options | 3.3V to 220V | Usually 12V/24V only |
| Waterproof rating | IP67 | Often IP40-IP65 |
| Housing materials | Metal (3 options) | Often plastic |
Frequently Asked Questions
Q: Can I use this switch outdoors?
A: Yes. With IP67 rating and SUS304 stainless steel housing option, these switches are designed for outdoor use including direct rain exposure.
Q: What is the difference between maintained and momentary?
A: Maintained (self-locking) stays ON when pressed until pressed again. Momentary (self-resetting) is only ON while being held down.
Q: Can I get custom engraving on the button?
A: Yes. Custom text engraving (Code T) is available with or without illumination.
Q: What voltage LED should I choose?
A: Match LED voltage to your control circuit voltage. Options range from 3.3V DC to 220V AC.
Q: Is this switch suitable for DC applications?
A: Yes. It is rated for DC-13 inductive loads at 15A for 12V/24V DC.
Conclusion
The 20A High Current Metal Push Button Switch series (16mm, 19mm, and 22mm) delivers exceptional performance for demanding industrial power control applications. With its combination of high current capacity, IP67 waterproof protection, wide voltage range, and flexible configuration options, this series provides a reliable solution for:
Industrial automation and machine tools
Heavy machinery and control panels
Renewable energy systems (BESS, PV, EV charging)
Food processing equipment
Outdoor and marine applications
Transportation equipment
Whether you need a maintained main power switch, a momentary start button with LED illumination, or a vandal-resistant outdoor control, this series offers the durability, safety, and performance your application demands.
📩 Contact us today for samples, technical datasheets, or volume pricing for your next project.