AA series moulded case circuit breaker(MCCB) available in two frame sizes from 25 to 800 amps. which can provide overload and short-circuit protection for the full range of transformer size  in normal ideal for many distribution applications. Otherwise,their features are reliable working out and steady performance, reasonable structure, beautiful appearance and small volume etc.

AA MCCBs are available in single pole, three poles, three poles with switched neutral and switch-disconnertor versions. Loadine triple poles LY Frame circuit breaker and switch-diseonnector are physically interchangable with AA breakers for Motor Duty repuirments. AA Frame have front adjustable overload and fixed instantaneous tripping elements.