MCB = Miniature Circuit Breaker is a device which protect from electric circuit from over current or short circuit. It is a better alternative of fuse in modern era of electric distribution. MCB are used at lower current circuit & having following specification.
- Current rating
- Short Circuit Rating
- Operating Characteristics - B, C or D Curves
Types of MCB based on Characteristics Curve:
- B Type Curve
- C Type Curve
- D Type Curve
This type of MCB trips between 3 and 5 times full load current. Type B devices are mainly used in residential applications or light commercial applications. The surge current levels in such cases are relatively low.
Type C Curve MCB:
This type of MCB trips between 5 and 10 times full load current. This is used in commercial or industrial type of applications where there could be chances of higher values of short circuit currents in the circuit.
Type D Curve MCB:
This type of MCB trips between 10 and 20 times full load current. These MCBs are use in specialty industrial / commercial uses where current inrush can be very high. Examples include transformers or X-ray machines, large winding motors etc.
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