1、The base, upper cover and arc extinction cover of the switch are all made of arc resistant plastic, with good mechanical strength, flame retardant and dielectric properties. 2、The arc extinction cover is equipped with multiple metal arc chutes, which strengthens the arc extinction ability of the switch, eliminating the harm of the electric arcing and improving the contact life. 3、Applicable to distribution circuit and motor circuit with high short-circuit current. 4、Simple structure, easy to disassemble and assemble, safe and reliable. 5、Comply with GB14048.3 standard. 1 x Fuse Type Isolating Switch Item Type: Fuse Type Isolating SwitchModel: HR17-250/30Rated Voltage: 400/690VRated Current: 250AFrequency: 50HzUse Category: AC-22B AC-23BRated Conditional Short-Circuit Current: 50KAMechanical Life: 1000Electrical Life: 5000Standard: GB 14048.3Options: Red Copper, Brass (Optional)