Question 1

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?

Accepted Answer

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.

Question 2

can this be used with 4/0 cable lugs

Accepted Answer

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.

Question 3

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?

Accepted Answer

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.

Question 4

Will the switch prevent auto theft

Accepted Answer

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.

ASIN	B07T288VN8
Actuator Type	Push Button
Best Sellers Rank	15,656 in Automotive ( See Top 100 in Automotive ) 38 in Car Battery Switches
Brand	Nilight
Circuit Type	1-way
Colour	On-Off Switch 275A
Compatible Devices	Car, Marine Boat, RV, Camper, Travel Trailer, Truck, ATV, UTV, Battery Banks
Compatible with Vehicle Type	ATV, Passenger Car, Trailer, Truck, UTV
Connectivity Protocol	X-10
Connector Type	Screw terminal
Contact Material	Copper
Contact Type	Momentary
Control Method	Push Button
Control Type	On/Off
Controller Type	Push Button
Country Of Origin	China
Current Rating	275 Amps
Customer Reviews	4.6 4.6 out of 5 stars (6,447)
EU Spare Part Availability Duration	2 Years
Global Trade Identification Number	00812227031862
Included Components	On/Off battery switch
International Protection Rating	IP66
Item Dimensions	9.8 x 7.3 x 7.2 centimetres
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	45 g
Lower Temperature Rating	1 Degrees Celsius
Manufacturer	Nilight
Manufacturer Part Number	90015A
Material	Copper
Model Number	90015A
Mounting Type	Panel Mount
Number of Items	1
Number of Positions	2
Operating Voltage	48 Volts
Operation Mode	ON-OFF
Specification Met	IP66
Switch Type	Toggle
Terminal	Screw
UPC	812227031862
Unit Count	1.0 count
Upper Temperature Rating	1 Degrees Celsius
Wattage	21760 watts

Battery Isolator Switch 12-48V 275A On/Off Waterproof Car Van Boat

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