175A Continuous Rating ON-OFF Two-Position Rotary Marine Battery Isolator Switch 12V-36V DC Battery Disconnect Switch

Choosing a master isolator comes down to two questions: how much current has to pass, and how many system voltages you need to cover. The MT015 answers both without extra complexity. It switches a single circuit with two positions, carries 175 amps continuously, and works anywhere between 12 and 36 volts DC.

That combination suits a workshop that stocks one part number for several boat and vehicle models, and it suits the installer who does not want to explain a multi-position dial to a customer. Turn clockwise for ON, anticlockwise for OFF, and the circuit state is unambiguous.

Use the table below as a starting point when matching the MT015 to a circuit. Figures assume cable and lugs are sized for the same current, since the switch cannot compensate for an undersized loom.

• Two positions only — ON and OFF, each with a mechanical stop, so no half-engaged state exists.
• Copper current path — lower resistance than plated steel, less stud heating over long charge periods.
• Moulded housing with flange — fixes flat to a console, locker wall or bracket without distortion.
• Substantial studs — heavy ring lugs seat fully, keeping contact area large.
• One SKU, three voltages — 12V, 24V and 36V installations all fall inside the rated window.
• Readable legend — ON and OFF can be identified at a glance or by touch.

The switch normally sits between the battery positive post and the main distribution block. On a boat that means the locker wall next to the battery box or the back of the helm console; on a camper it is usually the entry panel or the seat-base enclosure. Farm and yard equipment often gets one bolted to a steel bracket beside the battery tray so the machine can be isolated before service.

1. Isolate the battery negative first and prove the circuit dead before touching cables.
2. Plan the cable route so bends stay generous and the dial keeps full travel.
3. Fasten the flange evenly so the housing does not stress the panel.
4. Battery positive on one stud, distribution feed on the other.
5. Crimp, do not twist, every ring lug, then torque both nuts to a firm stop.
6. Operate ON-OFF once without load, reconnect, then feel the studs after a working load test.

At the start of each season, work the dial through its full travel a few times to clear any stiffness, verify nut torque, and inspect for salt film or green corrosion at the lugs. Replace cable that shows heat damage instead of simply retightening it. During storage, leave the switch at OFF so no parasitic load can drain the bank.

• 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.