Features and BenefitsDescriptionDrawout type generator circuit breakers for use in type GM-SG metal-clad switchgear are available. These circuit breakers are derived from the same type 3AH3 family of circuit breaker operating mechanisms as our standard non-generator circuit breakers. The basic design of the circuit breakers is the same, making maintenance and operation of the generator circuit breakers the same as for non-generator circuit breakers. This means that there is no incremental or additional training needed for your maintenance or operational personnel. The type GMSG-GCB generator circuit breakers exploit the long history of successful service provided by the entire type 3A (including types 3AF and 3AH operators) family of vacuum circuit breakers.These generator circuit breakers fully conform to the requirements for generator circuit breakers as specified in IEEE Std C37.013, "IEEE Standard for AC High Voltage Generator Circuit Breakers Rated on a Symmetrical Current Basis."EnlargeMedium-Voltage Vacuum Generator Circuit Breakers, Drawout Type GMSG-GCB for Small Machines 10 MW to 80 MWFeaturesOne-high or two-high drawout constructionUp to 50 full-fault interruptionsFront accessible circuit breaker operating mechanism for ease of maintenanceClosed door rackingFloor rollout circuit breaker in lower cell without a dollyVisible secondary disconnectCircuit breaker ships inside of cell, thus reducing installation cost and potential transit damagePair with Siemens protective relays to provide complete generator protectionDrawout type GMSG-GCB vacuum generator circuit breaker with type 3AH3 operating mechanismUses the latest developments in vacuum interrupter technologyHighly reliable vacuum interrupters - MTTF over 57,000 yearsCommon type 3AH3 operator platformOver 60,000 type 3AH3 operators produced since 1998Generator circuit breakers tested to IEEE C37.013/C37.013a10,000 operations to overhaulThree-cycle interrupting time (optional)Meets or exceeds the latest ANSI, IEEE and NEMA standardsUL or C-UL Listing availableAvailable in lineups of conventional type GM-SG switchgear, indoor or outdoor.