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MX or MN voltage releases are used to trip the circuit breaker.
MN undervoltage release
Time-delay unit for an MN release
MX shunt release
Trips the circuit breaker when the control voltage rises above 0.7 x Un.
Control signals can be of the impulse type (u 20 ms) or maintained.
When the circuit breaker has been tripped by an MN or MX release, it must be reset locally.
MN or MX tripping takes priority over manual closing.
In the presence of a standing trip order, closing of the contacts, even temporary, is not possible.
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