Does this relay connect the batteries automatically?

No. It is a normally-open relay, so it closes only when the coil is energized by a trigger you wire in, such as an ignition feed or a dash switch.

Can it handle a 200A winch load?

The rating is 200A nominal and 200A switching, but winch inrush can exceed that. Size the relay for continuous current and check surge against your load.

Is it safe to mount in the engine bay?

The housing is sealed and rated for -40 to 125°C, so engine-bay mounting is within its stated range. Keep the coil terminals dry and fused.

What comes in the box?

One isolating relay. No harness, fuse, bracket or instructions are included, so plan the wiring and fusing yourself.

Will it work on a 24V system?

No. The coil and rated voltage are 12V DC, so it is for 12V electrical systems only.

Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch

Best price now

$10.90at WalmartChecked Nov 3

Prices are checked against each store and labelled with when.

Visit Walmart

Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch

Best price now

$10.90at WalmartChecked Nov 3

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $10.90 at Walmart on Nov 3.

Our take on the Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch

The Baguer 4-pin isolator is a sealed 12V relay rated for 200A nominal and 200A switching current, used to link or separate a second battery in a vehicle charging system. It is a bare relay with a normally-open contact set, so it needs a trigger source such as an ignition or switch feed to close. It suits DIY dual-battery installs in trucks, campers and off-road rigs where a simple high-current contact is wanted. Against smart isolators it is cheaper in concept but has no voltage sensing, no delay and no manual override, so the installer supplies the control logic.

Best forDIY dual-battery wiring in trucks and campersHigh-current loads needing a sealed contactOff-road and overland electrical buildsInstallers who supply their own trigger circuit

Pros

200A nominal and switching rating handles heavy loads
Sealed housing suits engine-bay mounting
Wide -40 to 125°C working range
Simple 4-pin, normally-open design
Compact and light for its current rating

Cons

No voltage sensing or automatic charge control
No delay or override; needs an external trigger
Spec sheet is inconsistent, listing 80A in places
No mounting bracket or wiring included
Continuous 200A rating is not the same as surge tolerance

Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch prices at every store

WalmartNew
Availability unknown
$10.90Checked Nov 3
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Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch price history

Lowest price we've seen: $10.90 on Nov 3 at Walmart. Tracked across 1 store since Nov 3.

About the Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch

This is a 4-pin, 12V dual battery isolator relay for vehicle use. It is an electromagnetic relay with a sealed design, and it is intended for automotive control unit applications.

It has a nominal and switching current of 200A and works in temperatures from -40 to 125 °C.

Rated voltage: DC 12V
Nominal current: 200A
Switching current: 200A
Switching voltage: 7.8V
Pins: 4
Protection: Sealed
Working temperature: -40 to 125 °C
Use: Automotive control unit
In the box: 1 isolating relay

Questions and answers

Does this relay connect the batteries automatically?: No. It is a normally-open relay, so it closes only when the coil is energized by a trigger you wire in, such as an ignition feed or a dash switch.
Can it handle a 200A winch load?: The rating is 200A nominal and 200A switching, but winch inrush can exceed that. Size the relay for continuous current and check surge against your load.
Is it safe to mount in the engine bay?: The housing is sealed and rated for -40 to 125°C, so engine-bay mounting is within its stated range. Keep the coil terminals dry and fused.
What comes in the box?: One isolating relay. No harness, fuse, bracket or instructions are included, so plan the wiring and fusing yourself.
Will it work on a 24V system?: No. The coil and rated voltage are 12V DC, so it is for 12V electrical systems only.
Where is the Baguer 4Pin Over 200A 12V Dual Battery Isolator Relay Switch cheapest?: At Walmart, for $10.90, as of our latest check.