External auxiliary switch unit for circuit breakers

When an external auxiliary switching unit for a circuit breaker, consisting of an auxiliary contact mechanism (4) whose contacts are opened in response to on / off of a circuit breaker (2) and closed, and an alarm contact mechanism (5), consists of reacting of a release operation protection switch (2) operates, and which is constructed in such a way that the alarm-contact mechanism (5) is connected to a pivot-alarm output plate (7) of the circuit breaker (2), an actuating arm (5g) is provided in a manner that it of a contact holder (5d) of the alarm contact mechanism (5) is continuous and projecting from a housing unit (3) side, and when the circuit breaker is on or off, the actuating arm (5g) is supported on the alarm output plate (7) in order to keep the alarm contact mechanism (5) in an OFF position. When the circuit breaker is tripped in this state, the alarm output plate (7) is released from the actuating arm (5g), to turn on the alarm contact mechanism (5), so that an alarm signal is output. Then suppressed when the triggered circuit breaker into the initial position is reset, the alarm output plate (7) the actuating arm (5g) high, to return the alarm contact mechanism (5) in the OFF position, so that the output of the alarm signal to be stopped can.