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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Nilight 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

Nilight 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: 251913051

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Details

Operation Mode
ON-OFF
Current Rating
275 Amps
Operating Voltage
48 Volts
Contact Type
Normally Open
Connector Type
Screws

⚡275A continuous current rating

💧IP66 waterproof protection

🔒Secure On/Off isolation switch

Description

🔋 Cut the power, not your adventure – stay charged and in control!

ULTIMATE SAFETY LOCK - Eliminates battery drain with a reliable On/Off disconnect isolator, protecting your investment.
POWERHOUSE PERFORMANCE - Handles up to 275A continuous current for heavy-duty vehicles and marine use.
EFFORTLESS INSTALLATION - Includes 4 bolts and screw terminals for a secure, hassle-free setup.
VERSATILE COMPATIBILITY - Works seamlessly with 12-48V systems across cars, RVs, boats, and battery banks.
BUILT TO BRAVE THE ELEMENTS - IP66-rated waterproof ABS housing ensures durability in the harshest environments.

The Nilight Battery Switch is a rugged, waterproof heavy-duty power disconnect isolator designed for 12-48V systems. With a continuous current rating of 275A and IP66 protection, it safely isolates your vehicle or marine battery to prevent power drain. Compatible with cars, RVs, boats, and more, it features durable ABS housing, screw terminals, and comes with a 2-year warranty for reliable, long-term use.

Specifications

Operation Mode	ON-OFF
Current Rating	275 Amps
Operating Voltage	48 Volts
Contact Type	Normally Open
Connector Type	Screws
Brand	Nilight
Terminal	Screw
Item dimensions L x W x H	9.8 x 7.3 x 7.2 Centimeters
Circuit Type	2-way
Actuator Type	Push Button
Contact Material	Copper
International Protection Rating	IP66
Number of Positions	2
Upper Temperature Rating	1 Degrees Celsius
Controller Type	Push Button
Control Method	Push Button
Connectivity Protocol	Wi-Fi
Colour	Black
Wattage	21760 Watts
Net Quantity	1.0 Count
Number of Items	1
Global Trade Identification Number	00812227031862
Manufacturer	Nilight
Country of Origin	USA
Model number	90015A
Specific Product Use	personal
Item Weight	45.4 g
Product Dimensions	9.8 x 7.29 x 7.19 cm; 45.36 g
Item model number	90015A
Item Height	2.83 Inches
Item Width	2.87 Inches
Voltage	12 Volts
Compatible Device	Car, Marine Boat, RV, Camper, Travel Trailer, Truck, ATV, UTV, Battery Banks
Included Components	On/Off battery switch
Are batteries included?	No

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