Variable torque contact arm for electric circuit breakers

Details Variable torque contact arm for electric circuit breakers Variable torque contact arm for electric circuit breakers

1983-03-28

1984-10-30

Goldberg, E. A.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means

335 15, 335190, 200244, 200250, H01H 300

Patent

active

044802420

ABSTRACT:
A movable contact arm for circuit breakers allows the contact opening characteristics to be determined over an entire range of breaker ratings. The contact arm is provided with a camming surface with the contact closure spring arranged as a cam follower. Under short circuit conditions, the contact repulsion force is sufficient to overcome the bias provided by the contact closure spring and to drive the cam follower along the camming surface so that the resulting spring torque rapidly changes from a high initial torque on the contact arm to zero torque in a very short period of time. The contact arm is linked with the contact operating mechanism to open upon current overload in response to the trip mechanism.

REFERENCES:
patent: 2514839 (1950-07-01), Caswell

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