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.

Nilight - 90015A Battery Switch 12-48V Waterproof Heavy Duty Battery Power Cut Master Switch Disconnect Isolator for Car Vehicle RV and Marine Boat (On/Off),2 Years Warranty

Product ID: 136999375

Details

Brand
Nilight
Connector Type
Plug In
Contact Type
Normally
Current Rating
455 Amps
Item dimensions L x W x H
3.86 x 2.87 x
Material
Copper

🌊IP66 waterproof rating

🔋275A continuous current

🔧Heavy-duty ABS housing

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841375₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Cut the power, not the adventure — stay in control with Nilight!

SAFETY FIRST ALWAYS - Rear insulated cover and robust copper terminals prevent shorts and guarantee secure connections.
POWER THROUGH ANYTHING - Handles up to 455A intermittent and 1250A momentary current for ultimate reliability.
UNIVERSAL COMPATIBILITY - Works seamlessly with 12-48V DC systems across cars, boats, RVs, and more—your all-in-one power isolator.
BUILT TO BRAVE THE ELEMENTS - IP66 waterproof design ensures flawless performance in marine, RV, and outdoor environments.
EFFORTLESS CONTROL INSTALLATION - Simple rotary On/Off operation with included mounting bolts for quick, hassle-free setup.

The Nilight 90015A Battery Switch is a heavy-duty, waterproof (IP66) rotary power isolator designed for 12-48V DC systems. It supports continuous currents up to 275A and momentary surges up to 1250A, making it ideal for cars, RVs, marine boats, and more. Featuring durable ABS housing, insulated terminals, and easy On/Off operation, it eliminates battery drain and enhances safety with a 2-year warranty for peace of mind.

Specifications

ASIN	B07T288VN8
Actuator Type	Rotary
Best Sellers Rank	#309 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Battery Switches
Brand Name	Nilight
Circuit Type	1-way
Color	On-Off Switch 275A
Connectivity Protocol	X-10
Connector Type	Plug In
Contact Material	Alloy Steel
Contact Type	Normally Closed
Control Method	Touch
Current Rating	455 Amps
Customer Reviews	4.7 4.7 out of 5 stars (4,994)
Global Trade Identification Number	00812227031862
Included Components	On/Off battery switch
International Protection Rating	IP66
Item Dimensions	3.86 x 2.87 x 2.83 inches
Item Type Name	Nilight Battery Switch12-48V Waterproof Heavy Duty Battery Power Cut Master Switch Disconnect Isolator for Car Vehicle RV and Marine Boat (On/Off),2 Years Warranty
Item Weight	1.6 ounces
Lower Temperature Rating	1 Degrees Celsius
Manufacturer	Nilight
Material Type	Copper
Model	90015A
Mounting Type	Panel Mount
Number of Items	1
Number of Positions	2
Operating Voltage	48 Volts
Operation Mode	ON-OFF
Specification Met	CE
Switch Type	Rotary
Terminal	Marine
UPC	812227031862
Unit Count	1.0 Count
Upper Temperature Rating	1 Degrees Celsius
Warranty Description	2 Years Warranty
Wattage	21760 watts

Reviews

B**F

Does what a cutoff switch should do. Robust enough for big loads or light loads. Piece of mind.

Pretty robust/chunky heavy metal here folks. It will definitely handle some current, and should last quite a good long while. There's not much to go wrong. The coating on the metal appears good quality, not chintzy at all. Large bolts/studs, you're medium eye connectors might not be big enough, but always good to be overkill on gage, right!? So many ways to use this, but as a general rule, try to place as close to your battery source as possible--this just helps to ensure you have no other bleeds/consumers of your battery, and that you get them all, 100% of the time. If you relocate the switch further away, you can be successful, but trust me, there'll come a day when it's just too convenient to wire a new thing directly to the battery and bypass the switch--so just save yourself that future dilemma and make this switch the FIRST and ONLY connected device to your battery. Use a low gage jumper from the positive post to the switch, something like 8 or 10 gage for regular accessories, or maybe even lower if you're going to run a Trolling motor. Either way you wire this, you can count on it. Not much more you can ask of a cutoff, good connectivity for low and high amperage uses. Easy to use, easy on the wallet, easy to install. Great Value for it's functionality.

3.12.2025

G**A

Good switch for electronics

Bought this to turn the power off and on for my graphs. Quality product for the price and seems very durable. Good option for saving the battery from draining down and keep from disconnecting the units.

22.02.2026

L**.

worked great and good quality

24.02.2026

G**N

Lots of flexibility for installation purpose.

Great produced for the money. Easy installation and work as designed.

27.01.2026

M**B

works as described

nice cut off switch, easy to use and install

3.02.2026

B**D

Works well and easy to install

A very easy install. Works as intended. Just make sure you buy a small jumper cable because it doesn’t come with one.

14.03.2026

A**R

Works as expected.

Works as designed.

17.03.2026

E**E

Durable and easy to use. Haven’t had any issues with it.

I’ve been using the cut off switch in my metal building for a solar backup system. I only use the switch when I need to do maintenance, but I haven’t had any issues with it. The materials it’s made out of appear to be quite durable and high-quality. Red color makes it easier to see in case of emergency

17.12.2025

J**T

I use this in my battery pack back up system. This is my second order.

17.07.2021

R**H

Vendedor cumplido, buena calidad

16.07.2025

C**T

Stabil und wertig gemacht. Schrauben und Muttern nach DIN.

12.12.2025

L**S

Great

7.11.2025

D**O

All good lots of them out there, go for the cheapest.

30.05.2024

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