UNASSEMBLED FUSE HOLDER/ In-line Bayonet Knob Fuse Holder are intended for use at 32 Volts or less for 3AG, 3AB, or SFE style glass fuses. The body and knob features a secure spring-loaded twist lock and are each made of Black Thermoset (UL94 V-10) for flammability resistance. Fuse Holder UL Recognized to 20 Amps, 32 Volts DC.