Unitized motor starter

Details Unitized motor starter Unitized motor starter

H - Electricity

01

H

306/56

H01H 77/06 (2006.01) H01H 71/24 (2006.01) H01H 73/38 (2006.01)

Patent

CA 1073013

ABSTRACT OF THE DISCLOSURE 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 elements of each pole unit are arranged to provide a current loop having re- latively close opposing arms so that large mechanical forces accom- pany high magnitude current flow. These forces are directed so as to produce a blow-off effect at the circuit breaker contacts, re- sulting in current limiting action to protect the contactor contacts. A removable and replaceable overload sensing electromagnet is pro- vided for each of the pole units, and the coils thereof are of re- latively 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.

323111

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