Buss, Bussmann R25030-2C0R Fuse Holder; 1 Pole Fuse Holder 250V 30 Amp Fuse; Size: 2.050 Inch Width x 1.410 Inch Depth x 3.030 Inch Height Bussmann Class R 2-Pole Series fuse block is made of thermoplastic that offers strength and long lasting durability. It has voltage rating of 250 Volts and has a current rating of 1/10 - 30 Amps. Fuse block has box lug with retaining clip for quick connection and accommodates 2 - 14 AWG size of copper wire and 2 - 12 AWG size of aluminum wire.