Home Products Temperature Sensors 3BT and 4BT Series Hermetic TINY STAT™ Thermostat
Klixon
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3BT and 4BT Series Hermetic TINY STAT™ Thermostat

Klixon® Tiny Stats combine an impressive list of superlatives in a reliable, hermetically sealed, snap–acting Klixon® design. They are the smallest envelope size ever developed — ideal for remote sensing applications…

Manufacturer
Klixon
Part No
3BT/4BT
Category
Temperature Sensors

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Overview

Klixon® Tiny Stats combine an impressive list of superlatives in a reliable, hermetically sealed, snap–acting Klixon® design. They are the smallest envelope size ever developed — ideal for remote sensing applications in locations with severe space limitations. They are the lightest construction available — perfect for applications where weight is an important consideration. They have an extremely fast response in order to permit early warning of overheat conditions. The low mass internal components allow Tiny Stat precision thermostats to meet the most demanding shock and vibration standards of MIL-PRF-24236. 3BT and 4BT TINY STATS provide temperature control for key applications like bio-medical analyzers, transformers, gear box chip detectors, aircraft angle of attack sensors, aerospace DC motors, aircraft environmental controll fans, and travelling wave tube amplifiers.

Features

  • 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)

Part Numbers

Specifications

Switch ActionSPST (snap–action)
Contact Resistance0.050 ohms maximum (0.100 ohms maximum for close on rise devices with setpoints greater than 175°F) per MIL-STD-202, Method 307
Dielectric Strength500 vac, RMS, 60 Hz for 5 seconds, across open contacts, per MIL-STD-202, Method 301
Vibration Resistance5–2000 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 Resistance100 G, 6 milliseconds per MIL-STD-202, Method 213
Hermeticity1 x 10-8 atm cc/sec. maximum, per MIL-STD-202, Method 112, Condition C
Salt Spray ResistancePer MIL-STD-202, Method 101, Condition B, 5% solution
WeightBasic Unit: 0.2 to 0.9 grams
Ambient Temperature Range-80°F to 350°F (-62.2°C to 176.7°C)

Documents & Downloads

Part NumberFile DateFile TypeSizeDownload
3BT/4BT13/07/2023.PDF213KB