R3-72B with Fuse acces is a fuse holder made by SCI that has a fast act fuse. It is designed to provide manual override or quick circuit protection of a load without the need to open or disconnect the circuit. This fuse holder has an 18 AWG wire, a 10A fuse rating, and is rated for 600 volts. The holder is intended for indoor use and is UL approved. It can also be used with a variety of fuse sizes.