Special Features:

Part number: m1: part series, 158: top temperature setting farenheit; 138: bottom temperature setting farenheit; 1: open on rise, silver contacts; 3: top mounting bracket; 2: plating, copper/nickel; weight with bracket: 5.9 grams; hermetically sealed, vacuum backed and back-filled with dry nitrogen, single ploe, single throw, normally open or normally closed, preset, non-adjustable calibration, high vibration and shock resistance

Properties:

A protective device specifically designed to prevent damage to an electrical motor due to failure of the motor to start, severe overloading of short duration, too frequent starting, high ambient temperature, high or low circuit voltages, failure of ventilation or any combination thereof. It is designed to be either automatically or manually reset. Excludes circuit breakey; switch (1), thermostatic; heater, thermal release; and relay (1), thermal.