Circuit breaker contact operating structure

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Contact-actuating means

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Details

335 16, H01H 300, H01H 7700

Patent

active

050235834

ABSTRACT:
A circuit breaker contact operating structure characterized by a circuit breaker operating mechanism having separable contacts of which one is mounted on a contact carrying arm. The arm being mounted on a one leg of a U-shaped flexible conductor. A guide link is pivotally mounted and connected to the arm to maintain the contacts in alignment during their separation. The operating mechanism having a latch for latching the arm in the closed-contact position of the arm and having a trip device for unlatching the latch in response to an overcurrent condition. The mechanism link is so placed on the contact arm structure as to effect a blow-on force on the contact structure during the duration of high overcurrent. At a preset current level, the mechanism link is prevented from applying the balancing force to the contact structure, thus allowing the blow-off forces due to the current in the contact structure to separate the contacts rapidly, and to effect current limitation and subsequent circuit interruption.

REFERENCES:
patent: 4549153 (1985-10-01), Forsell et al.
patent: 4600908 (1986-07-01), Uchida et al.
patent: 4656444 (1987-04-01), McKee et al.
patent: 4680562 (1987-07-01), Bratkowski et al.

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