150A Continuous Current ON-OFF Two Position Rotary Battery Isolator Switch DC 12V-24V Battery Disconnect Switch for Boat RV

Replacing a tired or sticky master switch is one of the cheapest reliability upgrades on a DC system. The MT018 is built for exactly that job: a 150 amp two-position rotary isolator that drops into the same panel opening and gives a clean, positive break between the battery and everything downstream.

There is one dial movement to learn. ON closes the circuit, OFF opens it, and each end position has a machined stop so the contact cannot sit in limbo. For a boat that gets lent out, or a work vehicle used by several drivers, that simplicity removes a common source of flat batteries and unexplained dead circuits.

The switch is rated for 12 and 24 volt DC systems, carries a copper conductor assembly, and mounts through a flat fixing flange. Terminal studs accept conventional crimped ring lugs, so existing cabling can usually be reused when the rating matches.

• Worn original switch — intermittent contact or a loose dial replaced with a positive-action rotary unit.
• New build wiring — a master cut added between battery positive and the distribution block.
• Second-hand boat purchase — unknown-age isolator swapped for a known rating before the season starts.
• Camper and van fit-out — leisure board isolation added during a self-build conversion.

• Positive detent positions — ON and OFF each lock, so vibration cannot drift the setting.
• Copper conductor assembly — keeps volt drop and terminal heating low during charging.
• 150A continuous figure — matches mid-size DC boards without overspending on a heavy-duty unit.
• 12V and 24V DC coverage — one part number for both common system voltages.
• Flat flange body — screws down onto panels, lockers and brackets without an adapter plate.
• Clear dial legend — switch state visible at a glance and readable by touch.

1. Note the existing cable positions, then disconnect the battery negative lead first.
2. Prove the circuit dead at the switch terminals before removing any nut.
3. Take out the old unit and check the panel opening matches the new flange footprint.
4. Fasten the MT018 in place and reconnect battery positive and the distribution feed to opposite studs.
5. Fit new ring lugs where the old ones are crimped twice or show corrosion.
6. Torque both nuts, operate the dial once, then reconnect the battery and test under load.

• 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.