- Packed unassembled with plate, strike, fasteners, and spanner wrench. - May be used with carpet or threshold application by omitting face plate. - Spring loaded plunger returns to floor or threshold level anytime flushbolt is retracted, eliminating the need to clean out the bottom strike. Date.
MCB is miniature circuit breaker which is thermal operated and use forshort circuit protection in small current rating circuit in branches of panel boards for small loads.MCCB moulded case circuitbreaker and is thermal operated for over load current and magnetic operation forinstant trip in short circuit condition.he main differences are The MCCB is equipped with tripping coil and can give a signal. The protection board of MCCB is more developed. It has L-L, L-G, thermal, and instantaneous setting, while MCB doesn't has those facilities. MCCB is usually used for high current application/.
In order to restart the flow of current the MCB is manually turned on. This mechanism is used to protect from the faults arising due to over current or over load. To protect against fault arising due to over heating or increase in temperature a bi-metallic strip is used.CBs are generally designed to trip within 2.5 millisecond when an over current fault arises. In case of temperature rise or over heating it may take 2 seconds to 2 minutes for the MCB to trip.