What fuse size do you recommend?

It is recommended to configure 60A-80A fuse, if you think it is too low, you can also configure 100A fuse by yourself.

Does it work with solar chargers?

Yes. As long as the voltage of one battery reaches 13.3V, the isolator will start working and connect the two batteries. If you have any questions regarding the circuit design, we can offer one-on-one service.

Can I use this isolator with lithium batteries?

1. The main battery and the auxiliary battery are all lithium batteries. This isolator can be used.

The product is installed but not working, what could be the reason?

1. Check the voltage of the main battery has reached 13.3V.

What is the reason for the continuity, rhythmic lighting and extinction of the indicator lights of the product's work?

This is a normal phenomenon, the reason is that the voltage difference between the main battery and the secondary battery is too large. Generally after charging for a period of time, this phenomenon will disappear.

Split Charge Relay 12v 140amp Voltage Sensitive Relay Vsr Compatible

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚡ Power up your adventure with seamless dual battery control!

UNIVERSAL COMPATIBILITY - Perfect for trucks, RVs, boats, campers, and off-road vehicles—your all-in-one power partner.
PEACE OF MIND GUARANTEED - Crafted with precision and backed by dedicated after-sales support for worry-free use.
EMERGENCY REVERSE CHARGING - Auxiliary battery can power your main battery when it’s drained—never get stranded.
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof and silicone-sealed for ultimate durability in extreme conditions.
SMART DUAL BATTERY MANAGEMENT - Automatically switches at 13.3V to keep your primary battery charged and ready.

The UCkasayfy 12V 140Amp Voltage Sensitive Relay (VSR) is a rugged, IP67 waterproof dual battery isolator designed to automatically manage and protect your vehicle’s batteries. Compatible with trucks, RVs, marine vessels, and off-road campers, it ensures efficient parallel charging and emergency reverse charging, keeping your power systems reliable in any environment. Not suitable for lithium batteries.

Specifications

Asin	B09XPZMJ76
Best Sellers Rank	6,287 in Automotive (See Top 100 in Automotive) 12 in Car Relays
Brand	UCkasayfy
Coil Voltage	12 Volts
Connector Type	Screw
Contact Current Rating	140 Amps
Contact Material	Copper Alloy
Contact Type	Normally Open
Country Of Origin	China
Current Rating	140 Amps
Customer Reviews	4.0 4.0 out of 5 stars (51) 4.0 out of 5 stars
Manufacturer	UCkasayfy
Manufacturer Part Number	UK-BR001-12V-1
Minimum Switching Voltage	13.3 Volts (DC)
Mounting Type	Boat Mount
Number Of Terminals	2
Operation Mode	Automatic

Reviews

User

Great product

Very quick and easy set up and works perfectly

25.08.2024

User

Does the job

Very fast delivery. Well packaged

5.12.2024

User

Avoid

Don’t buy it, lasted 3 Weeks and then started to play up !

20.08.2026

User

Does what it should

Well made strong connectors..does what it should

8.05.2023

User

Next day delivery

As described

2.08.2024

User

Not very good

Not very good.Failed within a couple of months.Internal relay wasn’t disconnecting and discharging vehicle battery.Prefer the slightly more expensive one with a voltage meter. And a very distinct switching of the relay.

27.02.2025

User

Cut out voltage incorrect according to listedspecifications .

Installed this unit, once it was powered up, to my dissatisfaction I found that it's cut out voltage is 12.5 V (Fluke DMM) instead of the listed 12.8, it also draws 1 A. It is not as advertised and it will be returned.

17.08.2024

User

Simple and easy

Simple to install and a tidy little unit!

8.10.2022

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€ 52.42

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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Split Charge Relay 12V 140Amp, Voltage Sensitive Relay VSR,Compatible with Truck RV Marine Car Vehicles Caravan Off-road Camper Yacht，Not Fit for lithium batteries

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Details

Description

Specifications

Reviews

Common Questions