Enclosed 4 Port DC power distribution panel. The output ports are protected by one MAIN fuse. The ports are filtered by a common cap. This unit uses standard mini ATC automotive fuses; Surge and reverse polarity protection to 18 VDC; 25 Amp Main Fuse Rating; UL94 V-0 housing material. Size, 2 3/8" L x 1 3/8" W x 1 1/4" H