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H.T. Fuses for Indoor Potential Transformer

It is common practice in this country to use H.T. fuses on P.Ts. These fuses, when used, are intended to protect the system from faults in the transformer. The fuses available in this country are satisfactory for this limited application. It may however be appreciated that the currently available ratings of the fuses, are rather high to protect the transformer from overload/short circuit on the secondary side. If this protection is desired, use of suitably rated protective devices in the secondary circuit should be considered.