Top Post Battery Disconnect Switch 12V 125A Heavy Duty Brass Marine Car Truck RV Boat Anti-Corrosion Quick Release Knob for Battery Saver 0.59-0.67" Universal Fit Prevents Battery Drain (Red)

A vehicle left standing for a month rarely starts. Alarms, trackers, memory circuits and clocks all pull a small current without stopping, and a battery that spends winter under a tarp goes flat because of them. A master switch breaks that circuit with a twist of a knob, and puts the drain back to nothing.

One hundred and twenty-five amps, continuous

The rating is 125 amps, and unusually for a listing like this the basis is actually stated — the supplier writes 125 A continuous. That figure is the one to work to, and it is worth being clear about what it covers. It describes the current the switch is said to carry while closed. It is not a cranking rating, and no separate intermittent or cranking figure appears anywhere in the source. The practical consequence is that the switch has to suit the real load of your vehicle, and 125 amps is not hard to exceed: a winch under load, a large inverter, or a tired diesel on a cold morning can each go well past it.

Fifteen to seventeen millimetres is the fitment

The title says universal fit. The description says the switch takes tapered top posts between 0.59 and 0.67 inches, which the supplier also renders as 15 to 17 mm — those two figures agree with one another, and they are the genuine fitment. Universal this is not. It will not suit a side-terminal battery, a stud terminal, or any post outside that band, so measure across the top of yours before ordering. The body is brass with stainless steel hardware, and it goes on and comes off by hand, which the supplier states needs no tools.

Key features

• 125 A continuous: a rating with its basis stated, which is rarer than it should be.
• Knob operation: isolate and restore by hand, with no spanner involved.
• Brass with stainless fasteners: the two materials the supplier names.
• Tapered top post, 15–17 mm: the actual fitment window, published in both units.
• Red knob: visible at a glance when you want to know whether the battery is isolated.

Specifications

• Rated current: 125 A, stated by the supplier as continuous. No intermittent or cranking rating is published
• System voltage: 12 V
• Terminal type: tapered top post
• Post size: 0.59–0.67 in, given by the supplier also as 15–17 mm
• Materials: brass, with stainless steel hardware
• Colour: red
• Operation: hand knob, described as needing no tools
• Corrosion and water resistance: the source calls it corrosion-proof and waterproof but names no standard, IP rating or test — not carried here as a specification
• Overall dimensions, weight and cable stud size: not published

Fitting it to a live battery

• This goes onto a live battery. Disconnect the negative terminal first and refit it last. That sequence is what stops a spanner shorting a live post to the body.
• Take off rings, watches and metal bracelets before working near battery terminals.
• The switch must be rated for your vehicle's genuine maximum load, including any winch, inverter or auxiliary system. In a fitted-out 4WD, 125 amps is not a large number.
• No cable size is stated or implied anywhere on this page. A switch rating does not determine what cable to run — that follows from the load and the length of the run, and is a separate calculation entirely.
• Since no cranking rating is published, anyone intending to leave the switch closed during starting should satisfy themselves it suits that duty.
• Work of this kind belongs with someone competent on vehicle electrical systems. Where there is doubt, have an auto electrician fit it and check it afterwards.
• The corrosion-proof and waterproof wording in the source names no standard behind it. Read it as marketing, and inspect the switch regularly in coastal or marine use.

One hundred and twenty-five amps continuous, a 15 to 17 millimetre post, and a load figure worth working out before the knob is ever turned.

Returns, Refunds, and Replacements

Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

For customers in Victoria, approximately 7-10 working days;

For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days;

For customers in WA, NT, and TAS, approximately 9-12 working days.