I would like to use this to cut the power on my winch when not it use. Does anyone know if this will handle the draw when the winch is in use?

Check your winches max current draw at it's max pull. Most 10k winches can go over 300-amps easy some over 350-amps. Always use switches, contact points and terminals that can handle more than your devices rated maximum current draw and max voltage, even if it's only 10% more. Don't size for nominal loads, size for max current and max voltage plus a safety factor. Wire charts (current to awg wire size) is a safe minimum size. If it says 4awg wire, go to 2awg. Copper is cheap and it will lower your circuits overall resistance and current draw while being safer. Do this and you wont get suprised the general wire chart that is probably written for a very spoecific type of wire strand size, jacket, etc. You can go down in fuse/breaker size, it will just blow/trip more often. You can go up one fuse size and, at this current level, that means only 10-amps more. So if your winch can draw a max of 300-amps, the largest fuse you should use is 310-amps. Momentary is very subjective. Without a quatitative number, size components for maximum current draw. Also, NEVER put a switch on a Negative, Common or Neutral wire.

can this be used with 4/0 cable lugs

The switch doesn't care about the lug current capacity, just about physical characteristics of the lug, which unfortunately is not standardized. If the lug is bulky at its connecting area to the cable, some allowance might have to be made in mounting. The lug needs a fairly large hole opening where it connects to the switch, at least a 7/16 inch hole. The metal area around the hole opening of the lug can't be too large or it will short out to the connector on the other side of the switch, so some grinding of the lug's squareness might be necessary. Available thread on the switch terminals is more than adequate for a fairly thick lug.

I bought this to hook up to my rv battery case. i assumed it would come with instructions. does anyone have a good website showing how to hook it up?

Really no need for instructions. I installed it in my camper, its purpose is to disrupt electrical connection. If you have one main power cable then connect from the battery to the switch and then main power to switch. If there's a bunch of connections to the power side and not sure then you can also install the switch on the negative side which usually goes to one chassis ground.

Will the switch prevent auto theft

Only if the theft doesn’t know where the kill switch is. If it is placed in an accessible area they can still take vehicle.

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Description

🔌 Power Up Your Adventures with Confidence!

SAFETY FIRST - Eliminates battery drain when not in use, protecting your investment.
EASY INSTALLATION - Includes 4 bolts for a hassle-free setup, ready for action!
HEAVY DUTY DURABILITY - Crafted from robust ABS plastic, ensuring safety and longevity.
VERSATILE COMPATIBILITY - Perfect for DC 12-48V systems across vehicles, boats, and RVs.
POWER MANAGEMENT MASTERY - Effortlessly manage your power with 275A continuous and 1250A momentary ratings.

The Nilight90015A Battery Switch is a heavy-duty, waterproof power cut master switch designed for 12-48V systems. It features a durable ABS plastic housing, offers impressive power ratings, and is ideal for various applications including cars, RVs, and marine boats. With a focus on safety and ease of installation, this switch is your go-to solution for managing battery power effectively.

Reviews

N**N

Power Control Made Simple: Nilight 1-2-Both-Off Battery Switch

As a boat owner, managing power distribution efficiently is essential for a smooth and safe sailing experience. The Nilight 1-2-Both-Off Battery Switch has revolutionized how I control my vessel's electrical system, and I'm thrilled to share my experience with this ingenious product.First and foremost, the versatility of this battery switch is unmatched. With its 1-2-Both-Off functionality, I have complete control over which batteries are connected to my boat's electrical system. Whether I need to isolate a single battery for maintenance or balance the load between multiple batteries for optimal performance, this switch offers unparalleled flexibility.Installation was a breeze, thanks to the straightforward design and clear instructions provided by Nilight. I was able to mount the switch securely in a convenient location and wire it into my boat's electrical system with ease. The sturdy construction and quality materials inspire confidence, ensuring reliable performance even in harsh marine environments.The ergonomic design of the switch makes operation intuitive and hassle-free. The clearly labeled positions—1, 2, Both, and Off—make it easy to select the desired battery configuration quickly and accurately. Whether I'm starting the engine, charging multiple batteries simultaneously, or shutting down the entire electrical system, the Nilight battery switch simplifies the process with just a flick of the wrist.Durability is another standout feature of this product. Built to withstand the demands of marine use, the Nilight battery switch is resistant to corrosion, moisture, and vibration, ensuring long-lasting reliability even in the harshest conditions. I have peace of mind knowing that my electrical system is in good hands with this robust and dependable switch.Safety is always a top priority on the water, and the Nilight battery switch delivers in this regard as well. By providing a convenient means to disconnect the batteries from the electrical system, it helps prevent accidental discharge, electrical fires, and other potential hazards, keeping both my boat and crew safe at all times.In conclusion, the Nilight 1-2-Both-Off Battery Switch is a game-changer for boat owners seeking a reliable and versatile solution for power management. With its ease of installation, intuitive operation, durability, and safety features, it's an essential addition to any marine electrical system. I highly recommend this battery switch to fellow boating enthusiasts who value efficiency, reliability, and peace of mind on the water.

16.04.2024

K**E

Good product

Works great. Easy to install.

13.08.2025

A**E

Solid hard shutoff

I bought this shutoff for my boat and it works great as a main shutoff for all of the electronics.The click moving it to on and off feels very sturdy, and it came at a competitive price.One thing to note are the terminal screws are very large so expect to get some bigger connectors, but that's to be expected with how much power can be drawn through it.Also the switch only turns 90 degrees, not a problem, but at a glance that's not obvious.

15.09.2025

C**N

Mechanically works perfectly. Fitment is 4/5

Its a nicely built product. Has held up great for months. Its rather smal and has a clean look and fit. Switch toggles very easily.My only complaint is the locking ring its so thin it makes it not tighten into place very securely. I would up adding a bead of silicone to the back to make sure it stays in place.

27.05.2025

A**.

Great switch for boat battery; needs a 2" hole saw for rear panel mount

Great on/off switch for our pontoon battery box. You will need a 2" hole-saw for the rear panel mounting method. I also used a bead of silicone adhesive around the hole ring to make sure water doesn't get in.Lastly, I ended up having to dremel off the ends of the 4 mounting screws, because they are too long and hit the battery - and stopped the battery lid from fully seating.Overall the switch works as it should. Just be aware you may have to modify your battery box and cut off the screws to make it fit properly for a rear-mount.

21.07.2025

W**Y

Often on switch for live scope install installation

I installed a switch on my bass boat to run my live scope, but it worked good and simple to install

13.09.2025

T**S

Good quality switch

A common problems with these types of switches is internal resistance - they get hot when passing high amperage. This switch works very well. I routinely run 100 amps through it and it is barely warm.

17.09.2025

O**Z

Good product

These are good. They are big enough to turn easy to hook up and so far they work well.

6.09.2025

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