Hella002843011 2843 Series 100A Rating Battery Master Switch

I bought many of these switches for use as kill switches on my solar power systems. These work much better then the battery top kill switches. I also installed two on my inverter that is connected to my battery bank, plus one on my Solar Controller. Also use them on my battery charger for use on cloudy days. With these switches I can permanently attach all of my solar components and simply disconnect or connect them as needed. They are very easy to turn, and I usually just use a thin rope to tie them to the base of the switch.They are simple to install, ( They have 3/8 inch posts so make sure that the ring terminals that you use are sized correctly as these switches have thicker posts then most others ) and when you install them remember that they are "in-line" switches. They work on the positive ( hot ) wire, OR the negative wire. But positive in and positive out type of connecting...They work very well on my 12 volt and my 24 volt systems. I just have to watch the total amperage going through them.I strongly recommend these switches for their ease of use and their heavy duty quality.

For my application, I installed this on a deep cycle battery box placed on the front of a pop-up camper. I used a hole saw bit to cut a hole in the battery box and caulked around the switch after installation. I am using a small bungee cord to attach the key to the battery box. Installation was very simple and after 4 months of use, the product works exactly as described.Prior to using this switch, I would have to remember to open the battery box after each trip with the camper and disconnect the battery from the terminal. Otherwise the propane leak alarm would slowly drain the battery over time, efectively shortening the useful life since a deep cycle battery should never be discharged below 50%. This switch makes it super easy to turn off the battery and the red key serves as a visual reminder for me to turn off the battery while the camper is parked.

Based upon the many positive reviews, automotive forum mentions and articles for a battery cutoff switch I purchased this switch for my MGB (British sports car). Something I had been meaning to do for a very long time.MGBs have their single 12V battery or twin 6V batteries in a bin or bins behind the seats and covered by a secured panel. This may be clever placement, but not when you need to disconnect the power to work on electrical components. I mounted my switch behind the passenger seat. There are a lot of articles, photos, and videos about how to install one of these switches on the internet so you may come up with a different solution for your situation.This was an easy installation; although you will need a good 7/8" (22mm) hole saw for the key access post/port and a 1/4"+ drill for the mounting bolts (the tricky part). If you place the switch in the 7/8" hole from the opposite side you will have access to the two mounting holes on the switch as a guide. There was no drilling template with this switch.You will have to find an appropriate double ended lug cable to make the connection. Opinions differ; I chose to switch the Negative side to ground. The electrical posts allow for standard US 5/16" ? hole lug connections, but the nuts for the two cables appeared to be metric given that I needed to use a 17mm wrench to fasten the nuts. So don't lose these nuts, or prepare to take the switch to a hardware store.Just trying to be helpful here; as it's really a simple install with the right tools.The switch seems very sturdy, but the key handle/flag part seems just a bit too flexible. I did buy a spare key...just because.

Great product and it works on my 2022 Forest River Platinum

Our Polaris Virage TX PWC constantly drains the battery. I added one of these switches to the positive terminal harness using a 12" eyed battery extension and a couple of tie wraps to secure it. I had to drill out the stock battery eye to fit the Hella lug, and use a washer to secure the new extension to the PWC battery terminal. The Hella switch is very rugged and allows me to easily disconnect the battery when charging or in storage. My only complaint is that unlike the generic switches, it came with only one key. I ordered a spare just in case.

Master key worked from 1st time, easy instal into my pleasure way ascent.

Installed on a travel trailer and the switch worked fine and then failed after about a month (a total of 6 on/off cycles). Testing with a meter, the switch is open no matter what position the key is in.Update: I decided to see why this switch failed after 1 month. See the second picture. Huge corrosion and oxidation inside the switch! Why? See the first picture -- the o-ring seal on the stem is missing! You can see the retaining groove at the top of white stem. So, moisture wicked down to the low grade metal inside the switch. Unfortunately, without opening the switch assembly, there is no way to verify that the o-ring is installed.Also notice that there is no wiping action with this switch. The key just presses the contact plate down on the two stud contacts inside the switch and locks in place to hold the contact. Wiping action might have helped clean off the heavy buildup oxidation and corrosion.There is no perimeter seal on the round switch body, the top just fits over the bottom, so this switch is not waterproof, nor even water resistant. This must be installed in a dry location. Since the body does not seal, I would expect condensation to creep in, eventually corroding the terminals like what you see in the pictures.

This switch cost a lot more than most others yet it only has one key included and to top that off the key does not have a brass or metal pin like the others, its just a plastic pin sticking out ready to wear or break. I am disappointed at the lack of quality of the key which leads me to believe the switch itself is most likely just as poorly and cheaply constructed. Disappointing to pay more expecting a quality product to only get a lower quality product than expected and only one key when every other switch of this design have at least 2 keys included.