Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1975-07-22
1976-10-19
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 8, 335 11, 335 16, 337 6, H01H 7300, H01H 8300
Patent
active
039873820
ABSTRACT:
A unitized combination motor starter is provided with a single insulated housing wherein a plurality of pole units are disposed side-by-side. Each pole unit includes a circuit breaker contact section and a contactor contact section. A spring powered mechanism for circuit breaker operation is disposed on one side of the pole units and an electromagnet for contactor operation is disposed on the other side of the pole units. The current carrying elements of each pole unit are arranged to provide a current loop having relatively close opposing arms so that large mechanical forces accompany high magnitude current flow. These forces are directed so as to produce a blow-off effect at the circuit breaker contacts, resulting in current limiting action to protect the contactor contacts. A removable and replaceable overload sensing electromagnet is provided for each of the pole units, and the coils thereof are of relatively high impedance to act as a current limiter during short circuit conditions to thereby protect heaters of overload relays connected in series with the unitized combination.
REFERENCES:
patent: 2928997 (1960-03-01), Edmunds
patent: 3040144 (1962-06-01), Norden
patent: 3559120 (1971-01-01), Myers
patent: 3636482 (1972-01-01), Edmunds
patent: 3638157 (1972-01-01), Kruzic
Cataldo John B.
Keller Frank R.
Kussy Frank W.
Broome Harold
I-T-E Imperial Corporation
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