High-Level Project Summary
The operation of the MCB includes two stages, i.e., thermal operation and shortcircuit operation. The former operation based on the thermal effect of over currentwhile the later operation is based on the electromagnetic effect of over current.All MCBs operate on the air-break principle where the arc between the contacts isforced into the splitter plates through arc runners. This causes to spilt single arc intoa series of arcs and then extinguishes the arc by extracting the energy from the arcand by cooling it.With the use of bimetallic strip, thermal operation is achieved in case overloadconditions. When overload current flows through the MCB, the bimetallic strip getsheated and cau
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Detailed Project Description
The operation of the MCB includes two stages, i.e., thermal operation and short circuit operation. The former operation based on the thermal effect of over current while the later operation is based on the electromagnetic effect of over current. All MCBs operate on the air-break principle where the arc between the contacts is forced into the splitter plates through arc runners. This causes to spilt single arc into a series of arcs and then extinguishes the arc by extracting the energy from the arc and by cooling it. With the use of bimetallic strip, thermal operation is achieved in case overload conditions. When overload current flows through the MCB, the bimetallic strip gets heated and causes to deflect. In doing so, it moves the trip lever and releases the latch mechanism and hence the contacts open under spring mechanism.
Space Agency Data
The basic operating principle lies in the Toroidal Transformer shown in the diagram containing three coils. There are two coils say Primary (containing line current) and Secondary (containing neutral current) which produces equal and opposite fluxes if both currents are equal. Whenever in the case there is a fault and both the currents changes, it creates out of balance flux, which in-turn produces the differential current which flows through the third coil (sensing coil shown in the figure) which is connected to relay.
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