Adjustable circuit breaker thermal trip unit

Details Adjustable circuit breaker thermal trip unit Adjustable circuit breaker thermal trip unit

1989-03-22

1990-05-01

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 46, 335 45, H01H 7116

Patent

active

049222201

ABSTRACT:
Apparatus for adjusting the calibration of a thermal trip unit which is to be used in conjunction with an electrical circuit breaker. A rotatable knob is provided which adjusts the trip unit to between one hundred percent of the rating of the circuit breaker and some value which is less than one hundred percent. An adjustable stop screw is provided to engage the rotatable knob when the knob is rotated to adjust the calibration of the trip unit to the desired value which is less than one hundred percent of the rating of the breaker. The adjustable stop screw thereby limits travel of the adjustable knob between only one hundred percent of the rating of the circuit breaker and the desired value which is less than one hundred percent.

REFERENCES:
patent: 2884497 (1959-04-01), Steven et al.
patent: 3758887 (1973-09-01), Ellsworth et al.
patent: 3815064 (1974-06-01), Maier et al.
patent: 4255732 (1981-03-01), Wafer et al.
patent: 4698606 (1987-10-01), Mrenna et al.

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