500 Series Thermal Switch

sWAP-C, Robust, and Reliable Thermal Switch

500 Series Thermal Switch

Proven on commerical and military applications

This family of switches is the basis for many applications, combining small size with robust electrical characteristics packaged for severe environments with flexible mountings.

One of the greatest strengths of this switch is the "push-to-open" contact design. This means that the force of the flat spring is providing consistent closing force compared to other designs which use the bimetal disc to maintain closure of contacts. The available force for closing contacts using the disc is diminished as the snap-point is approached, increasing susceptibility to vibration and shock.

Performance and Enviromental Data

Performance Characteristics
Contact Arrangement: SPST
Contact Ratings5 amps resistive load at 28 VDC
2 amps resistive load at 115 VAC RMS
1.0 amp inductive load (L/R 0.02) at 28 VDC
Contact Resistance: 20 milliohms maximum
Endurance 100,000 cycles minimum at rated DC or AC load
Dielectric Withstanding Voltage: 1500 VAC RMS - terminals to case, 500 microamperes maximum leakage
Insulation Resistance 500 megohms minimum at 500 VDC

Environmental
Vibration (Sine):Method 204, 50g to 2000 Hz, 30g to 2000 Hz
Vibration (Random):Method 204, over 60g RMS, 20 to 2000 Hz
Shock:Method 213, 100g/6ms, 750g/0.5ms
Thermal Shock:Method 107, Condition B, -85° to +257°F (-65°C to 125°C)
Acceleration:Method 212, Condition A, 30g
Salt Spray:Method 101, Condition B, 48 hours
Moisture Resistance:Method 106, 240 hours, 90 - 98% RH and from +77°F to +149°F (+25°C
Hermetic Seal:Method 112, Condition C, Procedure IV

NOTE: The 500 Series thermal switches have been qualified to the requirements of Military Specification MIL-PRF-
24236, titled “Switches, Thermostatic, General Specification For”

Additional product specifications, outline drawings and block diagrams and test data are available on request.

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