Schneider frame circuit breaker MT circuit breaker failed to close the switch problem
Published:2023-01-09 17:10:16
Schneider structural circuit breaker has not stored energy (check the power supply of the energy storage motor, if normal check whether it can be manually stored energy)
MX shunt coil live (disconnect MX coil power supply)
MN coil is not charged or faulty (apply voltage higher than 0.85Un to MN)
The circuit breaker is locked in the "off" position
There is short circuit or earth fault in the circuit (clear fault)
Failure to reset after fault trip removal (press reset button)
XF coil continues to be charged, anti-jump function is in effect (disconnect the power supply of XF and then turn it on)
How to equip the auxiliary contacts OF T and SDE?
Schneider structural circuit breakers are standard equipped with a set OF 4 ON/OFF indicating auxiliary contacts and one SDE fault indicating contacts, which do not need to be selected by the user. H/L type MT can be added two more groups OF, can also be ordered alone. An SDE can be added to N/H/L type MT, but the MT switch must be ordered at the same time, and the SDE cannot be purchased alone.
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