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The UCkasayfy 12V 140Amp Voltage Sensitive Relay (VSR) is a robust dual battery isolator designed for trucks, RVs, marine, and off-road vehicles. Featuring automatic voltage sensing that activates at 13.3V and disconnects at 12.8V, it ensures your primary battery remains charged and protected. With a high 140A current rating, IP67 waterproof sealing, and durable copper alloy contacts, this relay excels in extreme conditions. It supports emergency reverse charging and wide vehicle compatibility, making it an essential upgrade for professional-grade battery management—excluding lithium battery setups where mixed chemistries are involved.
| 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 |
User
Great product
Very quick and easy set up and works perfectly
User
Does the job
Very fast delivery. Well packaged
User
Avoid
Don’t buy it, lasted 3 Weeks and then started to play up !
User
Does what it should
Well made strong connectors..does what it should
User
Next day delivery
As described
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.
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.
User
Simple and easy
Simple to install and a tidy little unit!
Trustpilot
1 week ago
2 weeks ago