Easily manage and control your 12V accessories with the MB Quart GMR-RB4 4-Circuit 20 Amp Relay Bank, designed for seamless integration and simple setup. Built for use with the GMR7V1 Source Unit (sold separately), this relay bank delivers powerful plug-and-play capability, giving users full digital control of up to four separate 12V circuits. Ideal for marine, off-road, or custom vehicle applications, the GMR-RB4 offers a reliable and professional-grade solution for powering lights, pumps, fans, or any other 12V accessory with ease.
Installation is straightforward with a simple three-wire connection. Just plug the included male JST connector into the GMR7V1’s ‘AUX TRIGGER’ port, then provide 12V power and ground via an 8 AWG wire (80A fuse required on the power wire). Each of the four independent circuits supports up to 20 amps max, offering plenty of power for a wide range of devices. Connecting accessories is quick, with clearly labeled terminals and simple 12V power/ground wiring.
What sets the GMR-RB4 apart is its built-in LED fuse indicators—a glowing red light instantly identifies a blown fuse while the circuit is still loaded, taking the guesswork out of troubleshooting and ensuring quick, hassle-free maintenance. Whether you’re adding off-road lights, air compressors, or audio components, the GMR-RB4 is your all-in-one solution for safe, clean, and efficient 12V power distribution. Get total control and a streamlined installation with the MB Quart GMR-RB4 Relay Bank—built for performance and engineered for simplicity.
- Seamlessly connects to the GMR7V1 Source Unit (sold separately), allowing full digital control of up to four 12V accessories
- Easy 3-wire hookup using a male JST connector and 8 AWG power/ground with an 80A fuse makes setup quick and clean for any vehicle application
- Features four independent circuits rated at 20 amps max each, ideal for controlling lights, fans, pumps, or other 12V components
- Glowing LED lights instantly identify blown fuses while a load is connected, helping you diagnose issues quickly without extra tools
- Streamlines the process of adding and managing 12V accessories with reliable performance and organized power distribution
- Color: Black
- Dimensions (L x W x H): 6.88 x 4.19 x 2 inches
- Weight: 0.8 pounds
- Manufacturer warranty: 1-year Warranty
Questions? We’ve Got Answers.
Helpful answers about product features, setup, and more
How big is the relay bank?
The relay bank measures 6.88 x 4.19 x 2 inches (length x width x height). Use these measurements to confirm the product fits your intended setup before ordering.
Is there a warranty on the relay bank?
Yes. The relay bank is backed by 1-year manufacturer warranty. Coverage details and claim procedures are provided by the manufacturer; retain your order receipt as proof of purchase if you ever need to file a claim.
What is the power source for the relay bank?
The relay bank uses 12V DC. Confirm you have the appropriate power connection, fuel, or battery type available at the location where you plan to use the product, and review any supplied power cords, adapters, or hardware before setup.
Who makes the relay bank?
The relay bank is made by MB Quart. MB Quart produces this item as part of its lineup, and product details such as specifications, included accessories, and warranty terms are set by the brand.
How much does the relay bank weigh?
The relay bank weighs approximately 0.8 pounds. Use this figure when planning transport, handling, or placement of the item.
What should I know about the relay bank before buying?
The relay bank from MB Quart brings together a few practical features worth highlighting:
- 1-year manufacturer warranty
Review the product description and specifications to confirm it matches your specific needs before placing your order.
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