Postek (HK) Co., Limited | HK Series
KWQM5-2-28 Hermetically Sealed Micro Switch
Screw-Clamp Terminal · Anti-Radiation · Cryogenic Rated · GJB 809B-2013
Screw-Clamp Terminal
Radiation Hardened
Cryogenic Rated
GJB 809B-2013
Outline Dimensions (mm)
1. Product Overview
✅ Source Verified — Technical data verified against original supplier datasheet. GJB 809B-2013 / GJB 360B-2009 compliant.
The KWQM5-2-28 Series is a hermetically sealed micro switch featuring screw-clamp terminal construction. Designed for anti-radiation and cryogenic applications where secure wire termination and environmental sealing are critical. Fully interchangeable with foreign equivalents.
Operating Force12 N
Pretravel≥ 0.6 mm
TerminalScrew-Clamp
Mounting2× M3
CircuitSPDT Changeover
Free Position10.8 mm max
Key Features
Screw-clamp terminal — secure wire connection for high-vibration environments
Hermetically sealed welded metal shell
Anti-radiation and cryogenic rated
SPDT changeover circuit configuration
GJB 809B-2013 / GJB 360B-2009 compliant
Fully interchangeable with foreign equivalents
2. Technical Specifications
2.1 Mechanical 📄 Datasheet P.17-18
| Parameter | Symbol | Value |
|---|---|---|
| Operating Force | O.F. | 12 N |
| Pretravel | P.T. | ≥ 0.6 mm |
| Free Position | F.P. | 10.8 mm (max) |
| Mounting | — | 2× M3 screws |
2.2 Environmental
| Parameter | Value |
|---|---|
| Radiation Resistance | Qualified |
| Temperature Range | Cryogenic to high-temperature |
3. Engineering Drawings
All dimensions in millimeters. Unmarked tolerances per GB/T1804-c.
4. Quality 📄 Datasheet P.16
Grade J
high-reliability industrial
Q/MA20458-2019
high-reliability industrial
Q/MA20458-2019
Compliant with GJB 809B-2013 and GJB 360B-2009.
5. Installation
In free state (C-NC closed), actuator must not contact switch leaf. Depress leaf ≥ 0.6 mm for contact transfer. Apply 12 N vertical force at PT + 2/3 OT for reliable switching.
⚠️ Precautions
- Disconnect power before installation or maintenance.
- Precision device — incorrect force on actuator will cause damage.
6. Ordering & Resources
7. Related
📚 Related Technical Articles
- How to Select Switches for Extreme Temperatures → — Cryogenic and high-temp switching
- Hermetic Sealing vs IP67: Which One Do You Need? → — Why hermetic matters for cryogenic systems