Mersen GPM Panel Mount Fuse Holders are in sizes to accommodate 5x20 mm, 1/4"x1-1/4", Class CC and Midget (1-1/2"x13/32") fuses. All 30A holders have glass-filled polyester insulators for extra dependability and trouble-free installation. Patented design allows same body to accept screw or bayonet knob. Flange design allows front or rear mounting. The 10A and 15A holders are for front mounting only. Product Specifications Amperage 15-30 Amp Body Material Thermoplastic Polycarbonate Connector Type 3/16 in Solder/Quick Connect Contact Material Tin-plated Copper Fuse Type 3AG Miniature Number of Poles 1 Pole TC Connection 3/16" Solder / QC Type Panel Mount Voltage 250-600 Volt