The Series 330 motor protection circuit breakers from c3controls (Beaver, PA) are available with thermal and magnetic trip elements providing overload and short circuit protection, and magnetic trip element only for short circuit protection. Both units come in universal rating and markings (A, kW, and HP), as well as third-party certification markings. They meet UL and CSA standards requirements as Manual Motor Controllers for use as Motor Disconnects, and meet National Electrical Code requirements for use in multi-motor applications. Also included are visible trip indicators for fast identification of which device tripped in a control panel where multiple motor protection breakers are installed.

Accessories include auxiliary contacts, shunt and under-voltage release modules, and wiring accessories such as commuting links and feeder terminals for distribution of power to multiple motor protection circuit breakers. Accessories are snap-on. Combination head terminal screws allow the use of straight, Phillips, or posi-drive screwdrivers. The ON/OFF manual operator enables motor circuits to be isolated without having to disconnect other control panel circuits. A test function is included to verify proper operation of the control circuit and accessories.

Motion Control Technology Magazine

This article first appeared in the June, 2006 issue of Motion Control Technology Magazine.

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