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In these applications where transformers must be appropriately protected, ABB’s new MS132-T is an excellent solution. Transformers generate at the start-up very high current peak (inrush current) of 8-20 times the nominal current, for this reason, regular protection cannot be used.
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Winding fault can only be protected on the primary side. Line protection and disconnect system is required on the primary side.
#Primary and secondary mccb circuit breaker manual
In addition, the device allows manual connection and disconnection of the transformer from the mains. Circuit breakers for transformer protection are specially designed for fuse less protection of control transformers on the primary side against overloads and short-circuits.