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When deriving control power from either a control power transformer or a metering potential transformer where the secondary voltage is 250 Vac or less, use a standard 1 A time-delay, 250 Vac fuse. An example of a suitable fuse is the Bussmann FNM.
If the control power is derived directly from the line voltage (305 Vac or less), use a rejection type time-delay fuse rated for 600 V, 3 A such as the Bussman type FNQ-R.