This is the Wylex B20 MCB Type B 20A Single Pole 240V AC, a plug-in miniature circuit breaker with yellow back ideal for general domestic use in the Wylex Consumer Units. In principle, this Wylex plug-in MCB detects overcurrents due to both overload and fault currents. The operating dolly can be locked ON or OFF without affecting the ability of the trip mechanism to operate.
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