1-OFF-2-BOTH Battery Isolator Switch 130 x 74 mm 2 Pole Battery Disconnect Switch for Marine Dual Bank Control

The MT044 is a four-position battery isolator built for crews who manage two separate battery banks. The dial runs 1 — OFF — 2 — BOTH, so the operator can feed the circuit from either battery, cut everything dead, or combine both banks when extra capacity is needed for starting or heavy loads.

Rated 300A continuous across a 6V to 32V DC range, the switch suits everything from a 12V outboard installation to a 24V commercial vehicle. The conductor parts are copper, which keeps resistance and terminal heat low through long charging sessions, and the ABS housing carries the mechanical loads of the mounting studs.

At 130 x 74 mm the body is compact enough for a helm console or battery locker but carries full-size terminal studs, so heavy cable is not compromised by a small switch. The rotary dial has firm detents at each setting, which means the position can be read at a glance — or by feel, in the dark, at the ramp.

• Copper conductor assembly — carries 300A continuous with lower resistance than plated steel.
• ABS housing — rigid moulding that holds the studs firm under vibration and takes a mounting load without distorting.
• Four detented positions — 1 — OFF — 2 — BOTH, each with a clear stop.
• Wide 6-32V DC range — one part number covers 12V, 24V and 32V installations.
• Full-size terminal studs — accept heavy ring lugs without reducing cable gauge.
• 130 x 74 mm body — fits compact panels while leaving room for cable routing.
• Visible dial marking — the selected position is readable without opening a panel.

• 1 — Bank 1 supplies the circuit. The default setting when a single start battery runs everything.
• OFF — Both banks isolated. Use for storage, transport and before any service work.
• 2 — Bank 2 supplies the circuit. The usual choice at anchor, running domestic loads from the house bank.
• BOTH — Banks joined for a cranking boost, or to let one charging source top up both batteries.

1. Switch off all loads, disconnect the negative leads of both batteries and prove the circuit dead.
2. Choose a flat, rigid panel area with clearance for the dial to turn through all four positions.
3. Mark and drill the fixing holes, test-fit the body, then tighten it down evenly.
4. Run bank 1 positive to terminal 1 and bank 2 positive to terminal 2, with the load or starter feed on the common terminal.
5. Fit ring lugs to every cable end and torque both stud nuts — an isolator is only as good as its terminations.
6. Check continuity in each position with a meter before reconnecting loads.

• Boats and yachts — separate start and house banks with a combined-boost option when needed.
• RVs and campers — leisure and chassis battery control, with a complete shutdown for storage.
• Cars, 4x4s and light commercial — dual-battery layouts feeding fridges, winches and work lights.
• Workshops and plant — battery isolation across shared machinery and mobile equipment.

• 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.