Patent ID: 6710988
Filing Date: 2004-03-23
Classification: H01H,H02H

Abstract:
A combination starter for protecting a motor from overload current and short circuit conditions in an electrical system, the combination starter comprising:a case; a combined electronic trip unit and contactor switch circuit within said case, said combined electronic trip unit and contactor switch circuit includes: a current transformer, an electronic trip unit electrically coupled to said current transformer, a coil energizing module optically coupled to said electronic trip unit, a contactor coil electrically coupled to said coil energizing module, a contactor mechanically coupled to said contactor coil, and wherein, said electronic trip unit is configured to provide a trip signal to said coil energizing module in response to an overload current condition in said electrical system; and a fuse within said case, said fuse electrically coupled to said contractor and configured for withstanding motor inrush current during motor start-up while interrupting said electrical system when said motor is operational and a short circuit current occurs within said electrical system.