I'm considering using this as a battery isolator for a winch on my Jeep. Can it handle the current? and what are the physical dimensions?

Your winch maker will list amperage for various amounts of load. Also switches will show three amperages they can tolerate for different amounts of time. So this switch is rated for 350 amps "continuous" (ie on for hours or permanently) 600 amps "intermittent" (for five minutes according to specs), and 1,200 amps "cranking"/peak for 30 seconds. OK so my SmittyBilt 9500 XRC Generation 3 winch has the following draws: 80 amps pulling zero lbs (winding rope in), 160 amps pulling 2,000 lbs, 220 amps pulling 4,000 lbs, 280 amps pulling 6,000, 340 amps pulling 8,000 lbs, and 385 amps pulling maximum of 9,500 lbs. H20 smitty and Second Gen XRC smitty use about 10% more amps. Also you "should" have a safety margin of 20%, ie no more than 80%. Now that means switch is ok continious running my winch are 2/3 of max load, and switch is fine running extreme max of winch load five minutes, five minutes rest, five minutes run, etc. BUT if you are anywhere over 50% of winch capacity/load you are going to run winch five minutes and rest the winch for five minutes anyway. so if your numbers are like mine you are ok. Check your winch makers specs on their website. Look until you find all numbers for the range of loads since the basic single amperage number they will list will be about 60% of max. I would say 90% of up to 12,000 lb winches are ok with this switch. But that presupposes you have at least read up on winching and know that you will damage your winch if you pull at max for more than four or five minutes. goodluck. PS blue sea's web page lists the contentious, intermittent five minutes and peak 20 seconds for all its switches. The other red "m" model is 300 continuous, this "E" is 350 continuous, and the gray one is 600, 900,1750

where can I get wiring instructions with diagram?

You tube has a few I found helpful.

Package says it’s compatible with up to 4/0 awg. my batter bank is 200a lithium tuning through 2/0 awg wire to my bus bar. will this switch work?

It is compatible with any wire that fits the terminals. AWG 4, 2, or 0. The important thing is the current and voltage. At 48 volts this switch should be good at 233 amps continuously. Here is my complete review: Fabulous switch. I have mine on my golf car and switch between two 48 volt battery banks; It is specified at Continuous rating: 350A, Maximum voltage: 32V DC. Doing the math: Power = Current x Voltage. Thus, 350 x 32 = 11,200 Watts that this switch can handle. So, 11,200 / 48 = 233 Amps continuous ... at 48 volts this switch should be good at 233 amps continuously. see less

What is alternator field disconnect vs the regular product without AFD? Looking to use on a camp trailer.

You do not need afd on a trailer, only on a vehicle with an alternator such as a motorhome or boat. It protects the alternator diodes upon disconnect.

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🔋 Switch to power, safety, and style—because your boat deserves the best!

PRECISION FIT - 3/8"-16 terminal studs for secure, professional-grade connections.
MARINE GRADE SAFETY - Ignition protected and ABYC compliant—perfect for gasoline-powered boats.
WEATHERPROOF WARRIOR - IP66 waterproof rating ensures durability in the harshest marine environments.
COMPACT LIGHTWEIGHT - Sleek metal design at just 590g fits seamlessly into any setup.
POWERHOUSE PERFORMANCE - Handles a robust 350A continuous current for reliable power management.

The Blue Sea Systems Battery Switch ON/Off AFD is a high-performance, ignition-protected marine battery switch designed for single circuit control. Rated for 350A continuous current and up to 48V DC, it meets rigorous ABYC standards and features IP66 waterproofing for reliable operation in demanding marine environments. Its compact metal construction and secure 3/8"-16 terminal studs make it an essential upgrade for professional-grade battery management on gasoline-powered boats.

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TrustScore 4.5 | 7,300+ reviews

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Color	Red
Size	No Size
Style	On-off
connector-type	Idc
Height	9 inches
Length	7 inches
Weight	0.59 Kilograms
Width	3 inches
Material Type	Metal
Number of Items	1
Number of Pieces	5
Wattage	1.68E+4
Included Components	BATTERY SWITCH ON/OFF
Batteries Included?	No
Brand	Blue Sea Systems
Department	Unisex-Adult
Manufacturer	BLUE SEA SYSTEMS
Item model number	9003e
Product Dimensions	7.37 x 16.21 x 21.92 cm; 590 g
ASIN	B000MMC914

Blue Sea Systems - Battery Switch ON/Off AFD

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