Features: 1.Premium Material: Battery switch is made of premium ABS and nickel plated red copper material, rustproof, sturdy and durable. 2.Function: The make before break contact design allows switching between battery packs without interrupting power supply, with AFD. 3.Excellent Performance: Good electrical conductivity, IP66 waterproof, prevents a strong spray of water, with ignition protection, safe and reliable. 4.Simple Installation: The installation is simple, mounting holes accept 1/4in (M6) screw, 1/2in (M12) terminal stud, convenient for using, save your efforts. 5.Wide Application: 500 amp continuous rating suitable for outboard and small petrol or diesel engines, ideal for RV or boat. Specification: Item Type: Battery Disconnect Switch Material: ABS, Nickel Plated Red Copper Switch Type: Heavy Duty Selector 4 Position Battery Switch with AFD Switch Positions: 4(OFF-1-2-1+2) Battery Combine: Yes Alternator Field Disconnect: Yes Maximum Voltage: 32V DC Terminal Stud Torsion: 220 in-lb (24.86 Nm) Continuous Rating: 500A Intermittent Rating: 700A (5 min) Cranking Rating 30 sec: 1600A Battery Inputs: 2 Cable Clearance For 4/0 AWG Cables: Approx. 27.94 mm/1.10in Cable Quantity to Meet Ratings: Two Cables or Terminal Cable Size to Meet Ratings: 4/0 AWG (120mm2) Mounting Holes: Accept 1/4in (M6) Screw Stud Material: Tinned Copper Terminal Stud Size: 1/2in (M12) Function: The Make Before Break Contact Design Allows Switching Between Battery Packs Without Interrupting Power Supply Application: Ideal for Marine or RV