Mission-Critical Switches — EMI Shielded · Radiation Hardened · GJB Qualified
High-reliability industrial-grade hermetically sealed micro switches for critical systems: EMI shielded, radiation hardened, cryogenic. GJB 809B, MIL-PRF-8805, -184°C to +260°C.
Industry Overview
critical systems operate under the most demanding conditions in engineering: sustained high-G vibration from tracked vehicles and rotorcraft, rapid thermal shock from high-speed flight, electromagnetic interference from high-frequency detection and communications equipment, radiation exposure in strategic systems, and absolute reliability requirements where failure is not an option.
HK Series hermetically sealed micro switches are designed from the ground up for these conditions. All-welded metal shell construction eliminates seal degradation paths. Gold-plated, bifurcated contacts ensure low and stable contact resistance through temperature extremes. EMI-shielded variants prevent interference in dense electronic systems. And dual-switch assemblies provide redundant switching for safety-critical functions.
Industry Standards
| Standard | Description |
|---|---|
| GJB 809B-2013 | General Specification for Micro Switches (China industrial standard) |
| GJB 360B-2009 | Test Methods: vibration (sinusoidal + random), shock, thermal, sealing |
| MIL-PRF-8805 | Switches, Sensitive — US high-reliability industrial specification |
| MIL-STD-461 | Electromagnetic Interference (EMI) requirements |
| MIL-STD-810 | Environmental Engineering Considerations and Laboratory Tests |
| Q/MA20347/Z-2019 | KWQM4 Series Detail Specification — J/Z Grade |
| YHYB S1201/001-2013 | Space-Grade KWQM4-4Z Detail Specification |
Recommended Series
KWQM4 Series
Flagship SPDT · 8 models · GJB 809B
- -184°C to +260°C full range
- 5A resistive / 3A inductive
- 8 electrical variants for different loads
- 4 actuator accessories
- J/Z Grade and Space Grade available
KWQM5 Series
Anti-radiation · Screw-clamp · Cryogenic
- Explicitly radiation-tested
- Screw-clamp for field maintenance
- -184°C cryogenic rated
- 2× M3 secure mounting
- GJB 809B-2013 qualified
KWQMY2-3AT11-1
Miniature EMI Shielded · Rad-Hard
- Integrated EMI shielding
- Radiation hardened
- 28V DC 1A / 0.5A
- Miniature form factor
- Potting sealed option
Recommended Models
| Model | Temp Range | Special Feature | Vibration | EMI |
|---|---|---|---|---|
| HK-KWQM4-4Z | -184°C to +260°C | Space-grade available | 15G sin · random | Standard |
| HK-KWQM5-2-28 | -184°C to +260°C | Anti-radiation rated | 15G sin | Standard |
| HK-KWQMY2-3AT11-1 | -184°C to +260°C | EMI shielded | 15G sin | Yes |
| HK-KWQMY2-3AT128-2 | -184°C to +260°C | Dual redundant switch | 15G sin | Standard |
Related Resources
Frequently Asked Questions
What makes a switch 'industrial-grade'?
industrial-grade switches must be qualified to high-reliability industrial specifications (GJB 809B / MIL-PRF-8805), survive extreme temperature cycling (-184°C to +260°C), resist electromagnetic interference (EMI), withstand radiation exposure, and maintain contact integrity under sustained vibration and shock. All HK hermetically sealed switches meet these criteria.
What is EMI shielding in a micro switch?
EMI shielding prevents electromagnetic interference from affecting switch operation or from the switch emitting interference that could affect nearby sensitive circuits. Our KWQMY2-3AT series includes an integrated EMI shield that attenuates radiated emissions — critical for flight systems and mission-critical communication systems.
Are these switches tested for extreme environments?
Yes. The KWQM5-2-28 and KWQMY2-3AT11-1 are explicitly rated for extreme environments. Contact our engineering team for specific total ionizing dose (TID) and single-event effect (SEE) test data for your application.
What is a dual-switch assembly and when is it needed?
The KWQMY2-3AT128-2 contains two independent hermetically sealed switches in a single envelope. This provides redundant switching for safety-critical mission-critical applications where a single-point failure is unacceptable. The dual assembly can be configured for synchronous or sequential actuation.
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