4AT Series Low Temperature Hermetic Position Switches
Switches
KLIXON® 4AT Series low temperature hermetic switches are snap-action devices that provide the reliable switching action in extremely harsh environments. These switches are designed to operate at temperatures as low as -275 °F (-170.5 °C) and while switching 3 Amps resistive at 30VDC. Sensata has over 100 different switch packages in single and multi-pole configurations with actuation styles such as leaf, lever, pushbutton, plunger, roller, and toggle. KLIXON® 4AT Series low temperature hermetic switches provide indication of position in many different aerospace and defense applications including liquid oxygen valves, satellite antenna position, and solar array positioning. Sensata's switches are used on the International Space Station and Mars Observer.
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Contact UsFeatures
- Qualified per MIL-PRF-8805, Enclosure Symbol 5
- Hermetically sealed with dry nitrogen gas backfill
- Proven snap-action switching, reliable performance and long life
- Excellent shock and vibration resistance
- Switching up to 4 amps
- Optimal for low level circuits
- Temperature range between -275°F and 450°F
- Small, lightweight axis–symmetric design for robustness and reliability
- Single and multiple pole designs available
- Various mounting configurations for custom applications
- Sealed and unsealed plunger options
- Wide range of side plate designs for narrow width applications
- PMA Approvals for various commercial aircraft
- Customer approvals for space and military applications
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Specifications
| Device Type | Low Temperature | ||
| Maximum Actuating Force (STP) | 28 oz | ||
| Minimum Release Force (STP) | 1 oz | ||
| Maximum Pretravel | 0.009” | ||
| Maximum Movement Differential | 0.003” | ||
| Minimum Overtravel | 0.002” | ||
| Overtravel Stop | No | ||
| Maximum Force on Actuator | 5 lb | ||
| Current Ratings in Amps (28VDC) |
Resistance | 3 | |
| Inductive | 1 | ||
| Lamp | 1 | ||
| Minimum Life @ Rated Load | 25K | ||
| Minimum Mechanical Life Cycles | 50K | ||
| Ambient Temperature Range | -275°F to 275°F (-170.5°C to 135°C) |
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| Dielectric Strength Terminal to Case Terminal to Terminal |
1000 VRMS 800 VRMS |
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| Max Leakage | 1 x 10-8 Std. cc He/Sec @ 1 atmosphere differential | ||
| Shock Resistance | 200G, 6 ms sawtooth | ||
| Vibration Resistance | 65G, 10-2000Hz, .5DA or 65GTMS | ||
| Insulation Resistance @ 500VDC | 100 Megohms | ||
| Voltage Drop @ 1 amp | 0.04 | ||
| SEAL (MIL-S-8805) | Design Enclosure 5 | ||
| Backfill | Dry nitrogen with 10% helium | ||
