DaierTek 12V 3 Way Waterproof Relay Box Pre-Wired Fuse and

DAIERTEK's 12V 3-way waterproof relay box is a compact, pre-wired assembly that combines three 4-pin 40A relays and three ATC/ATO blade fuses in a sealed, snap-cover enclosure for tidy, protected 12V vehicle circuits.

Whether you're installing auxiliary lights, a winch, or multiple accessories on a car, truck or boat, a small, organized relay-and-fuse module speeds installation and improves reliability. This unit arrives ready to mount and connect: color-coded wires, heavy-gauge feed leads, and a weather-resistant housing simplify wiring while keeping relays and fuses accessible for inspection and maintenance.

How does this relay box simplify multi-accessory wiring?

Instead of running separate relays and inline fuses for each accessory, you get three prewired relay channels in one compact module. That reduces clutter, shortens install time, and centralizes protection in a single location for easier troubleshooting.

• Three fused circuits with dedicated 4-pin relays for independent accessory control.
• Color-coded wiring (blue, white, yellow) for quick identification of each channel.
• Large 12 AWG main conductors handle high-current loads safely.
• Plug-and-play relays and ATC/ATO blade fuses included—no extra parts required.

Is the enclosure protected against moisture and vibration?

The box features a sealed base and a snap-on cover that together keep moisture and dirt away from terminals and relays. The cover is tool-free for fast visual checks, while the rugged housing helps the box withstand normal vehicle vibration.

• Sealed base design to reduce water ingress into relay cavities.
• Snap-on cover for quick access without tools and reliable protection in service.
• Durable plastic housing suited for engine bays, trunks, or under-dash mounting.

What safety and performance features are built in?

This relay-fuse assembly uses a dual protection approach: each circuit has a relay to control load switching and a correctly rated ATC fuse to interrupt overloads. Heavy-gauge feed wires and 40A relays keep voltage drop low and provide stable operation under high current draws.

• Three ATC/ATO blade fuses protect each channel from overcurrent events.
• Three 4-pin 40A relays handle switching of high-current loads without heat buildup.
• 12 AWG high-current terminals for robust power delivery to accessories.
• Pre-wired layout reduces wiring errors and increases installation safety.

How easy is installation and maintenance?

The module is delivered pre-wired and populated with relays and fuses, so installation mainly requires mounting and connecting power, ground, and accessory leads. Color-coded conductors make mapping circuits straightforward, and the snap-on cover speeds routine fuse checks.

• Pre-installed relays and fuses—no time spent sourcing parts.
• Color-coded wires simplify tracing and hook-up of each output channel.
• Tool-free cover access for quick fuse inspection and relay replacement.
• Compact footprint for mounting in engine bays, cabins, or compartments.

Who is this for? Tradespeople, DIY vehicle modifiers, marine hobbyists, fleet technicians and anyone adding multiple 12V accessories will benefit. If you need a neat, protected way to power lights, pumps, winches, or other 12V devices without running separate relays and fuse holders, this pre-wired DAIERTEK relay and fuse box speeds installation and consolidates circuit protection in one durable package.