DC 24V 100A Rated Current ON-OFF Two-Position Rotary Marine Battery Isolator Switch Battery Disconnect Switch

A 24V system usually fails quietly: a fridge left running, a lamp in a locker nobody checks, and three weeks later the bank is flat. The MT069 puts a hard mechanical break in that circuit, so the whole 24V side can be shut down with one deliberate turn rather than by pulling a fuse and hoping.

It is rated 100A at DC 24V — the range where caravan and small-boat house loads actually live: lighting, pumps, a fridge and an inverter in the 1–2kW class. The dial has a positive stop at each position, so anyone on board can tell whether the circuit is live without reading a label.

• 24V house banks on caravans and motorhomes — Kills lights, pumps, fridges and the inverter feed from one dial before storage or transport.
• Small boat and RIB electrics — Isolates a single 24V circuit where there is no room for a large breaker panel.
• Work vehicles and plant — Stops parasitic drain on machines that sit idle for weeks between jobs.
• Off-grid and solar cabinets — Gives a manual hard break ahead of the battery so service work can be done dead.

• Detent, not friction — The dial drops into a positive stop at ON and at OFF, so the position can be checked by touch as well as by eye.
• Copper bridge — Lower resistance than plated steel keeps the studs cooler at 100A and leaves a contact face that cleans up after years of use.
• Moulded ABS body — Holds terminal alignment when heavy lugs are torqued and does not soften in a hot engine bay or a sun-baked locker.
• Sealed joint — Keeps spray, dust and fuel mist out of the contact set, which is the usual cause of a switch that sticks or welds.

The rating that matters for wire is the continuous one. Work from 100A, add margin for length and bundling, then fuse the positive cable at the battery end. A switch protects nothing on its own; it only gives you a way to break a circuit that was built correctly in the first place.

1. Dial to OFF, negative lead off first — Prove zero volts at both studs before any other work.
2. Match cable and fuse to 100A — Size the run for the continuous figure with margin, and fuse at the battery end of the positive cable.
3. Fix to a flat, rigid surface — A flexing panel will loosen the stud nuts over a season; use the rear base on solid material.
4. Land closed ring lugs and torque fully — Bank positive on one stud, distribution feed on the other. Hand-tight is not a connection.

Model MT069, ON-OFF two-position rotary, ABS body with copper current path, rated 100A at DC 24V. Minimum order 5 pieces with the price quoted against quantity and packing. Standard production takes 30 days from deposit; T/T or Western Union, 30% down and the balance before shipment. Units ship in cartons, and pallet or mixed-container quantities can be quoted separately.