Fastronix 3/8" 2 Post (SPST) 180/1000 Amp High Current Battery Disconnect Switch

I was looking for a battery cut off switch for my trailer that would be accessible on the outside of my battery box. I didn't want the style that had a removable key, and I wanted one that would be durable. I also didn't want to spend a small fortune on it. This one fit the ticket. It was a little larger than I thought it would be, and I had to change the side of my battery box that I had originally planned on having it attached. It protrudes inside the box by several inches, and it would have hit my battery. I like this switch. It has a nice solid construction, metal instead of plastic. There is a definitive "click" when you switch it on. Now I don't have any parasitic drain on the batteries while in storage, and I can turn off the power even if my battery box is locked. The threaded shank of the switch is flat on two sides so you can get a wrench on it. I decided to drill the hole for it slightly smaller than the shank and then use a file to shape the opening to match the shank. This way when you tighten the nuts down, the switch won't rotate in the opening. I used a dab of RTV silicone behind the outside plate to prevent water getting in the box. I have had this setup for a year now and have had no problems with the switch, or water getting in the box.

I shopped several other brands for a good HD Battery disconnect for my Miata. I mounted this right under the rear hatch lock which already had a factory hole. I only had to enlarge it a little and it installed easily, in less than 15 minutes. Part is heavy duty and so far works perfectly. Now I'm legit at the track and no need to fumble with disconnecting the battery which is often.

The switches are better than advertised, very solid , heavy duty & very well made . I especially like the separate on/ off plate & the index post to keep the switch from rotating! ! Arrived within 30 hours of placing the order at half the price, or less of NAPA ! Very satisfied !

So I installed one of these in a buddy's jeep previously, its still hanging in there after months of on / off switches. This time I bought 2 for myself to install on a 96 F350 4x4 PSD box truck. I spent a bit of time fabricating 2 mounts so I can secure the switches near the radiator frame mount down near battery trays, Ideally you want the switches as close to source as possible ( but I have put disconnect switches in cabin just requires alot of expensive heavy gage cable. The pax side requires a bit of effort as two - 2/0 cables go from big OEM positive lug to starter and relay as well as the 2/0 series cable from drivers side (2 batts on a diesel, your application may differ). Yes the switch body is not indexed, if you install the switch with out securing the large faceplate it has a tendency to turn on you, its easily rectified by drilling a small screw thru faceplate (I used a self taper and then just cut off excess). This switch is beefy but it needs to be to handle cranking current an email with Andy at legacy auto (supplier) stated constant current at 180 but momentary at over 1000 amps. Another buddy has a 2001 PSD, he paid some guy to do his using some other brand switch and was charged over 500 dollars, I dont have that kind of cash and I prefer to do things myself.

I bought this to compliment a winch and ARB bumper install. I wanted a safety switch that would isolate the winches power leads from the battery. This way if a short was to ever happen through the winches solenoid, i would have the ability to shut the current off without removing a battery cable. This high current (amp) master battery switch was just what i was looking for. I installed it on the upper flat portion of the bumper wing. This switch is made of metal, so it will be durable in all weather situations, unlike some competitors that are made of plastic and are only suitable for under the hood installs. Update: 07/13/17 There has been no degradation to the painted switch face, or the levers +/- engagement. It switches from on/off with a semi firm twist, just like when it was originally installed. This is a must product when seconds count, and you have to cut the currant fast. Winch cont-actors are one of the most susceptible parts to go south on you, and can cause cross voltage arcing and fire when they do. This switch is 'piece of mind' for that possibility. The other reason for this, is the contactor locking the winch into reverse, and not shutting OFF. This can damage your truck or bumper assembly, as the winch wont stop spooling in, even when the 'controller' is in NEUTRAL.. Update: 03/26/18... Switch face plate is still fade free in hot and direct desert sun. The switch toggle lever is still tight, and the lever still has a nice "click" when moving the lever. It also has not loosened or slipped in it's mounting hole since installation. A switch like this should always be considered, when your dealing with the power of a electric winch. It is also something to consider in modern vehicles which can have a constant ECM memory drain, and vehicles that sit for long periods of time between use( click...click...click)!

It just arrived, and I unpackaged it and noticed that the front bezel is bent so it arrived damaged. I will bend it back and I think it will be fine if I pound it with a soft wooden mallet or rubber mallet, but I’ll install it after I repair it and then update this report. Update: After I straightened the bent bezel, it now looks great and seems to work well. Will put it under amp load and test and report. Will update to 5 stars if it works well after amp test.

Perfect for my application

Positive disconnect, works perfectly

I learnt about Fastronix product from another review which recommended buying this make over a much cheaper brand. This switch has a real heavy duty feel to it. When you turn it on you know it is on! And when you turn it off you know its off! There is nothing wishy washy about this one! worth the extra money.

Nice simple heavy duty disconnect, didn't want one with a removable key and needed something high amperage. Price was a little steep but the switch seems to be good quality.

These are good, but the two I ordered were sent in a plastic bag, so the face plates were beat up. They weight about 3/4 pound each and take a fair bit of force to switch. Judging from the sheer mass of these switches, I expect the internal contacts are solid and will safely carry a lot of current. I am using them as a battery disconnect in a motorhome.

Semble très solide

Install this on my camper is a battery disconnect so far I’m happy with it