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  • Smallest snap–acting thermal switches ever made
  • Extremely fast response
  • Single pole, single throw (SPST)
  • Normally open or closed
  • Preset, non-adjustable calibration
  • Hermetically sealed and back–filled with nitrogen
  • Gold plated
  • Various mounting configurations available
  • Qualified to MIL-PRF-24236/13 (4BT) and MIL-PRF-24236/19 (3BT)
  • Qualified to NASA S-311-641/06 (4BT) and NASA S-311-641/07 (3BT)


Switch Action SPST (snap–action)
Contact Resistance 0.050 ohms maximum (0.100 ohms maximum for close on rise devices with setpoints greater than 175°F) per MIL-STD-202, Method 307
Dielectric Strength 500 vac, RMS, 60 Hz for 5 seconds, across open contacts, per MIL-STD-202, Method 301
Vibration Resistance 5–2000 Hz, 30 G, per MIL-STD-202, Method 204
Vibration resistance specification does not apply to devices that open on temperature rise while at temperatures of 75°F or more below the opening temperature or to devices that close on temperature rise while at temperatures of 75°F or more above the closing temperature.
Shock Resistance 100 G, 6 milliseconds per MIL-STD-202, Method 213
Hermeticity 1 x 10-8 atm cc/sec. maximum, per MIL-STD-202, Method 112, Condition C
Salt Spray Resistance Per MIL-STD-202, Method 101, Condition B, 5% solution
Weight Basic Unit: 0.2 to 0.9 grams
Ambient Temperature Range -80°F to 350°F (-62.2°C to 176.7°C)

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