Product Specifications

Snap-Action Motor Protectors

The Therm-O-Disc line of Motor Protectors offers accurate and reliable protection against hazardous overheating in single phase/single voltage A/C motors. Available in a variety of product types, these motor protectors employ a snap acting, current and temperature responsive bimetal disc for proven performance over life. An internal resistance heater utilizes the effects of current to bias the operation of the bimetal disc for added thermal response. A wide range of bimetal and heater combinations are available to cover specific design requirements. This design flexibility and proven performance has made Therm-O-Disc Motor Protectors a popular choice among the leading manufacturers of fractional h.p. motors.

Features and Benefits:

• High-speed contact separation ensures long contact life.

• Current and temperature responsive for excellent design flexibility.

• Manual and automatic reset switching actions combined with a wide selection of bimetal discs and heaters to meet a variety of possible application needs.

• 100% temperature calibration and trip time tests assure high quality levels.

• The use of Statistical Process Control (SPC) techniques in all phases of manufacturing.

Type 20M – The Therm-O-Disc Type 20M SPST automatic reset protector is a rugged device designed for use on appliance and specialty motors up to 3/4 H.P. Available with side entry or end entry terminations, this device offers optional heater and bimetal combinations for additional design flexibility. The durable molded phenolic construction provides protection to live internal components and eliminates the need for mylar insulation.