Quick Summary
The Joinfworld 3M 140 Amp 12V Split Charge Relay Kit is a split charge relay kit with an LED voltmeter and manual or auto mode. It is set up for 12V use and includes a 140 amp voltage sensitive relay, cable lengths, battery terminals and MIDI fuse holders with 80 amp fuses.
The manual and auto functions are central to the buying decision, along with the included cable set and fuse holders. If you need a split charge relay kit for a 12V setup, check the exact connection requirements and included parts before choosing an offer.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Product type | Split charge relay kit for 12V use. |
| Relay rating | 140 amp voltage sensitive relay, so the current rating is an important check for the intended installation. |
| Control modes | Manual and auto mode are included, giving two operating options. |
| Voltmeter | LED voltmeter included for voltage display. |
| Cable lengths | Includes 3 × 1 ft red battery cable and 1 × 10 ft red battery cable. |
| Fuse holders | 2 × MIDI fuse holder with 80 amp fuse are included. |
| Battery terminals | 2 × positive brass battery terminals are included. |
What to Compare Before Buying
- System voltage: This kit is for 12V use, so it needs to match the system you plan to install it on.
- Current rating: The relay is rated at 140 amp, so compare that with the intended electrical setup.
- Included cable lengths: Check whether the 3 × 1 ft cables and 1 × 10 ft cable suit the layout of your installation.
- Included protection parts: The kit includes MIDI fuse holders with 80 amp fuses, which matters if you want the complete listed parts in one pack.
- Operating mode: Choose between manual and auto mode depending on how you want the relay to switch.
What Is Included
- 1 × 140 amp voltage sensitive relay
- 3 × 1 ft red battery cable
- 1 × 10 ft red battery cable
- 2 × positive brass battery terminals
- 2 × MIDI fuse holder with 80 amp fuse
How It Works
In manual mode, the blue LED turns on after the button is pressed for 3 seconds. In auto mode, the relay connects automatically when the input voltage exceeds 13.3V and disconnects when it drops to 12.8V. In this mode, the voltmeter and red LED indicator are also on while the circuit is connected.
If two batteries are connected, the voltmeter shows the battery with the higher voltage. To check the other battery, disconnect one battery so the meter can show the remaining one. If the voltmeter is not showing figures, press the button once and the display appears for 2 seconds.
Choosing the Correct Version
This kit is the 140 amp 12V version, so the relay rating and system voltage are the main version checks. The manual and auto control option is also part of the configuration, along with the included cable set and fuse holders.
Before You Decide
Confirm that you need a 12V split charge relay kit with a 140 amp rating. Check that the included cable lengths, terminals and fuse holders suit your installation plan. If the manual and auto switch function matters, make sure this is the configuration you want before choosing an offer.
Safe Use and Important Precautions
The kit includes 80 amp fuse holders and is described as waterproof, dustproof and vibration-proof. Follow the manufacturer’s instructions for installation and use, and check that the electrical setup matches the intended system before fitting.
Using It in Practice
This kit is aimed at split charging in vehicles and boats, and the included parts are arranged around that kind of installation. The voltmeter and manual or auto control make it easier to monitor the connected batteries during use.
Common Buyer Questions
Does it include the cables and terminals?
Yes. The kit includes 3 × 1 ft red battery cable, 1 × 10 ft red battery cable and 2 × positive brass battery terminals.
Can it show battery voltage?
Yes. An LED voltmeter is included, and it displays the higher of the two connected battery voltages.
Is it for 12V systems?
Yes. The relay kit is listed for 12V use.
