The DC fuse opens or breaks the circuit when the excessive current flow through it . The only difficulty with the DC fuse is that the arc produced by the direct current is very difficult to extinct because there are no zero current flows in the circuit. Specification: Model NO: RT18-63 Rated Voltage: 1500VDC Breaking Capacity: 20ka Standard : IEC 60269-6 Fuse Size: 10 x 85mm 14 x 85mm Class of Operation: GPV Package includes: 1 x CNC 1500V DC FUSE RT18-63