Circuit breaker with improved contact push-off spring

Details Circuit breaker with improved contact push-off spring Circuit breaker with improved contact push-off spring

H - Electricity

01

H

306/287

H01H 75/08 (2006.01) H01H 71/52 (2006.01) H01H 73/22 (2006.01)

Patent

CA 1168281

ABSTRACT OF THE DISCLOSURE A circuit breaker has contacts engageable as a result of manual operation of a toggle mechanism causing the circuit breaker to close and open when the toggle is in an erect and collapsed condition, respectively. A push-off spring is used to bias a moveable contact away from a stationary contact to accelerate movement of the moveable contact during opening of the circuit breaker. Minimal manual effort is required to close the circuit breaker while providing greatly increased pressure for accelerating opening of the circuit breaker through use of a unique push-off spring which provides a first, lower, degree of resistance to closing of the contacts during the initial operation of the circuit breaker while providing a second, higher, degree of resistance to closing of the con- tacts after the initial operation. Manual closing of the circuit breaker is unimpeded by the second, higher, degree of resistance after the initial operation of the breaker.

392666

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