When selecting the right type of circuit breaker for a particular application, the following three criteria must be taken into account:
1) Current limiting class (= selectivity class)
MCBs are divided into the current limiting (selectivity) classes 1, 2 and 3, which are based on the switch-off time under short-circuit conditions.
2) Rated current
The rated current indicates the current values that a MCB can permanently withstand at an ambient temperature of 30 °C (in residential and commercial applications).
3) Tripping characteristics
Circuit breakers with tripping characteristics B and C are the most common types, as they are the standard in both residential and commercial applications.
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