The internal fail safe element in the shape of a blade fuse is adjusted directly to the current rating of the corresponding circuit protector thus ensuring ease of adjustment to the cable cross section This means that the current rating of the protector and the rating of the fail safe element are identical Thus the REX12 rated 4 A holds a 4 A blade fuse to IEC 60127 4 2 and to UL248 14 Besides the UL508 listed approval and NEC Class 2 the REX12 exclusively meets the requirements of cable protection to EN60204 1 Schematic diagram REX12 with fixed current ratings blade fuse semi conductor 10 tr ip t im e in s ec on ds times rated current trip curve REX12 1 000 100 10 1 0 1 0 01 0 001 0 8 1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 2 8 3 0 3 2 3 4 IKS Apart fro m UL508 and NEC Class2 the REX1 2 exclus ively me ets the requirem ents of c able prot ection to EN60204 1 The REX system protecting while keeping the standard firmly in view 4 A LINE 4 A LOAD Class2

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