ECN Forum Forums General Topics of the Trade General Discussion Area New Transformers/New Short Circuit Current

Winnie,

A current limiting protective device has two primary selection values, one of which is Ip, the peak current that flows in the circuit before the fuse begins to melt(according to the NEC this must be substantially less than without the device). The other is the Tc or total current clearing time (UL allows 1/2 cycle maximum).