<P> Many classifications of circuit breakers can be made, based on their features such as voltage class, construction type, interrupting type, and structural features . </P> <P> Low - voltage (less than 1,000 V) types are common in domestic, commercial and industrial application, and include: </P> <Ul> <Li> Miniature circuit breaker (MCB)--rated current not more than 100 A. Trip characteristics normally not adjustable . Thermal or thermal - magnetic operation . Breakers illustrated above are in this category . </Li> <Li> Molded Case Circuit Breaker (MCCB)--rated current up to 2,500 A. Thermal or thermal - magnetic operation . Trip current may be adjustable in larger ratings . </Li> <Li> Low - voltage power circuit breakers can be mounted in multi-tiers in low - voltage switchboards or switchgear cabinets . </Li> </Ul> <Li> Miniature circuit breaker (MCB)--rated current not more than 100 A. Trip characteristics normally not adjustable . Thermal or thermal - magnetic operation . Breakers illustrated above are in this category . </Li>

What are circuit breakers and how do they work