Definitions for "Thermal protector"
A device that protects a ballast from overheating. The Class P thermal protector used in most ballast is a bi-metal switch that opens a circuit when the ballast becomes overheated, and closes the circuit when the ballast cools down.
A device that is sensitive to temperature and reacts to abnormal or excessive temperatures to protect critical components. Thermal protectors are used on SCR controls.
An inherent overheating protective device which is responsive to motor temperature and which, when properly applied to a motor, protects the motor against dangerous overheating due to overload or failure to start. This protection is available with either manual or automatic reset.