Circuit breaker with tamper indicating calibration means.

摘要

A circuit breaker with a thermal trip has a calibration opening (115) in the electrically insulating housing (3) through which a tool may be inserted and rotated to distort a support plate on which a bimetal is mounted to calibrate the thermal trip after the circuit breaker has been fully assembled and enclosed within the insulating housing. A tamper indicating seal (117) in the form of a destructible film secured over the calibration opening by an adhesive having an adhesive strength exceeding the tensile strength of the destructible film provides a visual indication of any subsequent attempts to tamper with the calibration setting. <IMAGE>