250A Continuous 360A Intermittent Yellow Marine Battery Isolator Switch ON-OFF Battery Disconnect Switch for Boat

Two numbers describe this switch, and both matter. It carries 250 amps continuously, and it will take 360 amps for the short bursts that a windlass, thruster or hydraulic pack demands. Add a yellow housing and you get a master isolate that can be picked out instantly on a busy panel or inside a dark battery compartment.
Operation stays deliberately basic: rotate to ON, rotate to OFF, with a detent stop at each end. No intermediate selector position, no combined-bank link, nothing that needs explaining to a charter guest or a new crew member.
Maximum working voltage is 32 volts, so the same unit suits 12V and 24V installations. Studs accept conventional ring lugs, and the body mounts through a flat flange onto a panel, bulkhead or battery box wall.

• Instant identification — the master isolate stands out from fuse holders, busbars and black switch bodies.
• Quick emergency response — crew find the cut-off by colour before reading any label.
• Fleet colour coding — use yellow for main isolation and another finish for auxiliary circuits.
• Moulded finish — colour is in the material, so it does not flake around the fixings.

• Two-position rotary dial with positive stops at ON and OFF.
• Copper current path for low resistance and controlled stud temperature.
• Flat flange body that mounts to panels, bulkheads and locker walls.
• Large terminal studs sized for standard crimped ring lugs.
• Face legend readable at arm's length and identifiable by touch.

• Windlass and capstan — burst draw inside the intermittent window.
• Bow thruster — short runs with cooling gaps between them.
• Domestic distribution board — sustained draw well inside the continuous figure.
• Camper leisure circuits — fridge, lighting, pumps and inverter feed.
• Workshop and yard equipment — isolation on shared machines and trailers.

1. Turn the dial to OFF and disconnect the battery negative lead first.
2. Verify the circuit is dead at both studs with a meter.
3. Position the body where the dial has full travel and cables can bend freely.
4. Mark the flange holes, drill, then fasten the housing down evenly.
5. Battery positive on one stud, distribution or starter feed on the other.
6. Crimp closed ring lugs, torque both nuts fully, then cycle ON-OFF once before reconnecting.

Shut down heavy consumers before moving the dial. Opening a 250A circuit under load will draw an arc and damage the contacts. Keep the yellow housing clean so the colour stays easy to see, check nut torque each season, and replace cable with corroded lugs rather than retightening it.

• Minimum order — 5 pcs.
• Price — negotiable, quoted against quantity and packing requirements.
• Capacity — 50,000 pcs per month.
• Lead time — 30 days for standard production.
• Payment — T/T or Western Union; 30% deposit with the balance before shipment.
• Packing — neutral white box inside a brown carton; branded packing available with written trademark authorisation.