FUNCTION MCB:
MCB serves to cut off power automatically if the power is delivered exceeds the limit value. This MCB is on / off, and can also serve as the main switch in the house. If the MCB is in a state bargainser off, then all the power in the house was halted. The switch is normally turned off when the repairs will be carried out electrical installations in the home.
MCB is a safety net that works on the principle of Bimetal, with some elements of the operation are:
1. Terminal trip (Bimetal)
2. Electromagnetic trip (coil)
3. Arc extinguishing
4. mechanisms of termination
By construction, the MCB has two ways of termination, namely: termination by heat and by electromagnetic.
1. Termination by the heat carried by the bimetallic rods, which are: combination of two different metals expansion coefficient of metal. If there is more flow due to overload, the bimetal will bend due to the heat and will push the breaker lever to release the mechanical lock. This causes the MCB trip.
2. Termination by ektromagnetik performed by the coil, if a short circuit occurs then the coil will be induced and the surrounding area there is a magnetic field that will pull the lever shaft and operate the breaker. To avoid the effects of melting, the high heat sparks that can occur when the termination will be muted by extinguishing arc (arc-shute) and sparks that arise will go through the blades of the arc-shute.
An automatic safety advantage is that it can be used again immediately after the termination, the automatic safety clutch freeway because there is otomatic clutch can not be used again if problem not improved.
The nature of the MCB are:
a. Load current can be considered when the heat generated heat in excess of permitted
b. Short circuit current can be decided without any slowdown
c. After the repair, the MCB can be reused.
The workings of MCB
1. Based on the heat. At MCB are bimetal plate (mix two different metals heat expansion coefficient). Bimetal will fold if there is excessive heat through. Bimetallic plates are curved because the heat will move the lever and the breaker will disconnect electric current.
2. Based on electromagnetic. Termination of electric current carried by the coil method is contained in the MCB. In the event of excessive current (MCB limit) will be induced so that the coil generates a magnetic field that will pull the lever breaker, so contact the MCB will be disconnected.
The size of the ability to decide MCB electrical current depends on the specifics of each MCB. For example, for a capacity of 2A MCB MCB will then work cut electric current when an electric current through the MCB exceed 2A. Each installation must take full account of the power requirements of each installation is installed.
It should be noted also for use in power installations that use the 3 phase occurs when the MCB trip (interference), the third MCB connected to each phase (RST) to open / end together.
I think the circuit breaker would be intact if the power was cut off with something else (like another breaker or main power switch) and not through the breaker itself. Someone correct me if I'm wrong.
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