Magnetic trip adjustment based on spring load variation

Details Magnetic trip adjustment based on spring load variation Magnetic trip adjustment based on spring load variation

1979-07-25

1981-02-03

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335 42, H01H 7174

Patent

active

042491525

ABSTRACT:
A three pole circuit breaker includes, for each pole, an electrical conductor, a magnet in close proximity to the conductor so as to generate a magnetic field when excessive current flows therethrough, an armature adapted to be attracted to the magnet when the magnetic field is generated therein, and a torsional spring adapted to restrain the armature from attraction by the magnet. A common rotatable crossbar is coupled to the torsional springs for simultaneously varying forces on the three torsional springs, so as to vary a magnetic level for the circuit breaker.
The circuit breaker further includes a housing, a button rotatable within the housing and adapted to be rotated from without the housing, and a cam affixed to the button within the housing. The cam is coupled, via a rotatable link, to the rotatable crossbar so that rotation of the button causes angular movement of the crossbar.
Movement of an armature toward its respective magnet causes particular movement of a respective trip bar which actuates a circuit breaker mechanism.

REFERENCES:
patent: 3391361 (1968-07-01), Jencks et al.
patent: 3484728 (1969-12-01), Shaffer
patent: 3845432 (1974-10-01), Heberlein, Jr. et al.
patent: 4034322 (1977-07-01), Canonne
patent: 4114123 (1978-09-01), Grenier

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