Circuit breaker comprising an electronic trip device

Details Circuit breaker comprising an electronic trip device Circuit breaker comprising an electronic trip device

1990-09-05

1992-05-19

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 97, 361115, 361 78, 335 44, H02H 504

Patent

active

051153718

ABSTRACT:
The circuit breaker comprises a thermistor located in a cold zone, near the front face of the trip device and at least one thermistor located in a hot zone, at the bottom of the circuit breaker case, in proximity to the circuit breaker connection terminals. The temperature difference measured between the hot and cold zones is representative of the temperature rise of the system protected by the circuit breaker and is used to modify the time delay of a delayed tripping function when the circuit breaker closes. The trip device can also take into account the temperature difference existing at the time of the previous trip.

REFERENCES:
patent: 3863186 (1975-01-01), Mallonen
patent: 3927570 (1975-12-01), Hedvall et al.
patent: 4001649 (1977-01-01), Young
patent: 4232551 (1980-12-01), Pierce
patent: 4571659 (1986-02-01), Demeyer et al.

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