Specification for GE Magne-Blast Type AM Circuit Breakers

Specification forGE Magne-Blast Type AMCircuit BreakersPowell Apparatus Service8550 Mosley Dr.Houston, TX 77075(713) 944-6900 - p(713) 948-4569 - fCONSTRUCTION CRITERIACircuit BreakersNew circuit breakers shall be removable three-pole, single-throw, stored energy operatedand capable of performing at least one close-trip operation without recharging. The openingand closing mechanisms of the new circuit breakers shall be in accordance with the ANSIpreferred ratings as specified in C37.06. The opening and closing mechanisms shall bespecifically designed to operate the vacuum interrupters provided while providing amplecapability to operate existing auxiliary mechanism operated contacts. The circuit breakermechanism shall be electrically and mechanically trip free under all conditions and at anypoint in the stroke, and the control circuit shall be capable of continuous energization. Thestored energy device shall be motor operated and shall be designed so that the springs maybe charged and the circuit breakers closed or tripped manually. A manual charge handleor lever shall be furnished. Trip and close devices for non-electric operation of the storedenergy mechanism shall be furnished on the front of the circuit breaker. The stored energyoperating mechanism shall be completely front accessible. The breaker shall be arrangedso that it will not close unless the springs are fully charged except that it shall be possibleto close the contacts slowly for inspection purposes after the breaker is withdrawn fromits compartment. The stored energy device shall be automatically and safely dischargedwhen the breaker is in the process of being withdrawn or inserted into the circuit breakercompartment.Interlocks shall be provided so that the breaker element contacts cannot be connected ordisconnected from the stationary compartment contact until the circuit breaker has beentripped and the main contacts are open.ALL circuit breakers of the same rating shall be interchangeable and it shall not be possibleto insert a circuit breaker of lower rating into a higher rated compartment.Primary and secondary disconnecting contacts shall be silver-plated and shall be designed toconsistently mate with their respective existing stationary contacts. The primary contacts,bus bar, and their supports shall be guaranteed not to distort or fail under the mechanicalstresses and heating resulting form the current values specified for the circuit breakers.Positive grounding of the circuit breaker frame shall be maintained while in the operatingand test positions.©2004 Powell Apparatus Service • All rights reserved.