KWQM4 Series
Hermetically Sealed Micro Switches
Metal shell welded hermetic seal. SPDT changeover. Solder lug termination. 8 electrical variants spanning -184°C to +260°C, 0.5A to 5A. Aerospace, cryogenic, and industrial qualified.
Temperature-184°C to +260°C
Current Range0.5A – 5A
CircuitSPDT Changeover
SealingHermetic ≤1×10⁻³ Pa·cm³/s
Electrical Life100,000 cycles
TerminationSolder Lug
Grade J/Z high-reliability industrial
Space Grade
CAST Grade
QPL
GB Standard
Parameter Envelope
Engineering capability boundary of the KWQM4 series
Temperature-184°C to +260°CContinuous operation
Current Rating0.5A – 5AResistive / Inductive
Voltage28V DCSelect models: 115V AC 400Hz
SealingHermeticLeak rate ≤1×10⁻³ Pa·cm³/s
Electrical Life100,000 cyclesMechanical: 500,000 cycles
Mounting2× M2, Φ2.2mmTorque ≤ 0.16 N·m
Variant Matrix
Select the right variant for your application — 8 electrical codes across 3 temperature classes
| Code | Part Number | Temperature | Current Rating | AC 400Hz | Use Case | |
|---|---|---|---|---|---|---|
| N | HK-KWQM4-4Z | -184°C ~ +125°C | 5A / 3A | ✅ | Aerospace / Cryogenic | View → |
| M | HK-KWQM4-4Z-1 | -65°C ~ +125°C | 4A / 1A | ✅ | General Purpose | View → |
| E | HK-KWQM4-4Z-5-1E | -184°C ~ +260°C | 4A / 2A | ✅ | High Temperature | View → |
| J | HK-KWQM4-4Z-5-1J | -65°C ~ +260°C | 4A | — | High Temp DC | View → |
| C | HK-KWQM4-4Z-9-1C | -184°C ~ +121°C | 0.5A / 0.25A | — | Precision / Altitude | View → |
| F | HK-KWQM4-4Z-9-1F | -65°C ~ +125°C | 0.5A | — | Low Current | View → |
| A | HK-KWQM4-4Z-11-1A | -184°C ~ +121°C | 3A / 1A | ✅ | flight systems | View → |
| G | HK-KWQM4-4Z-11-1G | -65°C ~ +125°C | 3A | — | Industrial Control | View → |
Applications
Where KWQM4 series switches are deployed
🛰️ Aerospace & flight systems
Flight control, orbital deployment, high-altitude platform systems
❄️ Cryogenic Systems
Operation down to -184°C for liquid gas and vacuum
🏭 Industrial Automation
High-reliability control for harsh environments
🔬 Precision Instruments
Low-current switching for sensitive circuits
Cross Reference & Alternatives
Equivalent series and drop-in replacements
Equivalent Series
- Honeywell HM Series Hermetic
Similar seal rating, SPDT configuration - TE Connectivity CH Series
Comparable temperature range
Interchangeability
- ✓ Fully interchangeable with foreign equivalents of same type
- ✓ Drop-in replacement for MIL-PRF-8805 compatible switches
- ✓ Custom actuator attachments available on request
Technical Assets
Engineering documentation for KWQM4 series
Drawings
3 files: dimensions, circuit, positions
Certifications
- GJB 809B-2013
- GJB 360B-2009
- GB/T1804-c