Magnetic trip means for circuit breaker

Details Magnetic trip means for circuit breaker Magnetic trip means for circuit breaker

1976-10-05

1978-12-12

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335176, H01H 900

Patent

active

041298438

ABSTRACT:
A magnetic trip means for automatically opening a circuit breaker contact upon the occurrence of predetermined fault current conditions is constructed of a stationary yoke, an armature biased away from the yoke and movable toward the yoke for tripping of the switch, an actuating coil in series with the contacts, and a sealed capsule coaxial with the coil for obtaining selected tripping characteristics. Within the sealed capsule there is a movable magnetic core biased to a normal position extending substantially outside the coil. The core is movable inside of the coil toward the armature upon the occurrence of overload current conditions with movements of the core toward the armature being retarded in a controlled manner. Control is obtained by closely spacing the outer cylindrical wall of the core and the inner cylindrical wall of the capsule, and additionally by utilizing a viscous fluid within the capsule. For a given overload current, as the core moves closer to the armature there is an increased force acting to move the armature toward tripping position.

REFERENCES:
patent: 2690528 (1954-09-01), Wilckens
patent: 2700711 (1955-01-01), Wilckens
patent: 3081387 (1963-03-01), Smith
patent: 3226605 (1965-12-01), Wright et al.
patent: 3307130 (1967-02-01), Camp
patent: 3517357 (1970-06-01), Bakes

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