Circuit breaker with tamper indicating calibration means

Details Circuit breaker with tamper indicating calibration means Circuit breaker with tamper indicating calibration means

1990-07-30

1991-04-16

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 82, 335 42, 335 45, H01H 7106, H01H 7510, H01H 7704

Patent

active

050086456

ABSTRACT:
A circuit breaker with a thermal trip has a calibration opening in the electrically insulating housing 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 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.

REFERENCES:
patent: 3566318 (1968-12-01), Gelzheiser et al.
patent: 3849747 (1974-11-01), Mrenna et al.
patent: 4148004 (1979-04-01), Gelzheiser
patent: 4630019 (1986-12-01), Maier et al.

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