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Air Circuit Breaker (ACB) is an electrical device used to provide Overcurrent and short-circuit protection for electric circuits over 800 Amps to 10K Amps.2a - Type designation for Electrical. Charging device (ECD). 2b - Operating voltage for ECD. 4a - Type designation for Under- voltage release (UVR). the insertion or draw-out operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury. Construction of Air-Circuit Breaker · OFF button (O) · ON button (I) · Main contact position indicator · Energy storage mechanism status indicator · Reset Button The circuit breaker has a "stored-energy" operating mechanism with pre-charged springs. Those springs are manually charged with the front lever or electrically (Marine). (Marine). 2. ACB. Susol Air Circuit Breakers. LSIS Made It! Super Solution operation characteristic by digital type of trip relay and the easy. ACB. Trip relay (OCR). Motor (M). Closing Coil (CC). Shunt Coil (SHT). Under Voltage Trip Device (UVT). Door Interlock (DI). MOC (Mechanically Operated Cell for DC applications. The SENTRON WL circuit-breakers are supplied complete with operating mechanism (manual operating mechanism with me-. Each of the type DH air circuit breakers is three-pole, electrically operated, and is built as a complete horizontal drawout unit for metal-clad switchgear. The simplicity of these operations means that any personalisation required can be carried out directly by the end customer. Emax air circuit-breakers.