Circuit breaker with automatic catch to prevent rebound of blow

Details Circuit breaker with automatic catch to prevent rebound of blow Circuit breaker with automatic catch to prevent rebound of blow

1997-11-20

1999-06-15

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335195, 218 22, H01H 7500

Patent

active

059126051

ABSTRACT:
The outside poles of a three pole circuit breaker are each provided with a blow open latch which includes a latch hook having an open slot forming jaws pivotally mounted on the contact arm. A torsion spring biases the jaws to a cocked position in which they are aligned for engagement with a fixed stop member toward which the contact arm rotates as it blows open in response to the magnetic repulsion forces generated by a short circuit. As the jaws engage the stop member, the latch hook is rotated to mechanically latch the latch hook on the stop member thereby preventing rebound and reclosing of the contacts. A leaf spring mounted on the crossbar holds the latch hook in mechanical engagement with the stop member. As the circuit breaker responds to the overcurrent condition and rotates the crossbar, the leaf spring disengages from the latch hook so that the torsion spring can rotate the latch hook back to the cocked position for disengagement from the stop member upon reclosing of the circuit breaker.

REFERENCES:
patent: 4733211 (1988-03-01), Castonguay et al.
patent: 4887057 (1989-12-01), Gula et al.
patent: 5341191 (1994-08-01), Crookston et al.
patent: 5363076 (1994-11-01), Miller et al.

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