WG31A Pre-Wired Waterproof 12V 40A Single Relay Fuse Box
Product Overview
ENGLISH
The WG31A Pre-Wired Waterproof Relay Fuse Box is a compact single-circuit power control solution designed for 12V automotive, off-road, truck, SUV and marine electrical systems.
Unlike large multi-circuit fuse and relay boxes, the WG31A is designed specifically for applications that require only one independently controlled high-current accessory. It combines a 40A 4-pin automotive relay, ATC/ATO blade fuse protection and pre-wired leads into one compact enclosure, helping simplify installation and keep auxiliary wiring organized.
The pre-wired design reduces the need for complicated terminal crimping and relay socket assembly. Color-coded wiring makes it easier to identify power input, ground, switch trigger and accessory output connections, making the unit suitable for both professional installers and DIY vehicle modification projects.
It is an ideal solution for auxiliary LED lighting, work lights, driving lights, horns, fans, pumps and other 12V DC electrical accessories.
Pre-Wired Plug-and-Install Design
EN:
Pre-installed color-coded wires simplify relay and fuse wiring. The installer only needs to connect the appropriate power supply, ground, switch trigger and accessory output according to the wiring diagram.
2. Dedicated Single-Circuit Power Control
EN:
Designed for users who need to control one auxiliary electrical accessory without installing a large multi-way fuse relay box. The compact design provides an independent power distribution and protection point for a single device.
3. 40A 4-Pin Automotive Relay
EN:
Equipped with a 12V 40A 4-pin automotive relay for switching higher-current DC accessories while reducing the electrical load passing directly through the dashboard switch.
4. ATC/ATO Blade Fuse Protection
EN:
Uses widely available ATC/ATO automotive blade fuses, making fuse replacement convenient. The package includes three blade fuses for installation or replacement according to the ordered configuration.
5. Protective Enclosure for Harsh Environments
EN:
The enclosed relay and fuse housing helps protect electrical components from dust, splashing water and contaminants commonly encountered in engine bays, off-road vehicles and marine electrical installations.
6. Cleaner and More Professional Wiring
EN:
Instead of mounting separate relays, fuse holders and loose wires around the battery, the WG31A combines major circuit protection and switching components into one enclosure, helping create a cleaner OEM-style auxiliary wiring installation.
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LED Light Bars｜LED
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Off-Road Lights
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Driving Lights
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Work Lights
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Auxiliary Horns
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Cooling Fans
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12V Water Pumps
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Marine Accessories
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Truck Accessories
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卡车辅助电气设备SUV Electrical Upgrades
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ATV / UTV Accessories｜ATV / UTV
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DIY Automotive Electrical Projects
Model｜ WG31A
System Voltage｜DC 12V
Relay Type： 4-Pin Automotive Relay
Relay Rating：40A
Fuse Type: aTC / ATO Blade Fuse
Included Fuses：3 pcs
Circuit Type｜: Single Circuit / 单路
Wiring: Pre-Wired / 预接线
Housing: Protective Automotive Electrical Enclosure
Application: Automotive / Truck / SUV / Off-Road / Marine / DC Electrical Accessories
Why Choose a Single Relay Fuse Box?
For many vehicle upgrades, only one auxiliary accessory needs independent control. Installing a large 6-way or 12-way fuse relay box can increase cost, installation space and wiring complexity.
The WG31A provides the relay, fuse protection and pre-wired connections required for one accessory in a compact package. It is especially suitable for users adding a single LED light bar, horn, pump, fan or other high-current 12V accessory.
OEM & ODM Available
FUZTRAX provides automotive fuse box, relay box and wiring harness manufacturing services. Relay specifications, wire length, wire gauge, fuse configuration, terminals, connectors, packaging and branding can be customized for OEM and wholesale customers.
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