Nilight 12V Fuse Relay Box 6 Relays 6 Fuses - Organized Waterproof Kit

In this review the Nilight 12V fuse relay box is evaluated as a compact, pre-wired solution for anyone adding multiple fused circuits to a vehicle. The bottom line: it is best for DIY installers and mechanics who need a tidy, consolidated relay center to replace a messy tangle of wires. The kit's main selling point is convenience - a waterproof, insulating enclosure with six relay slots and six blade fuses already wired, which simplifies installing additional lighting, accessories, or auxiliary systems on cars, trucks, campers and boats.

Key Features

• Six relay slots: Provides room for up to six independent 12V circuits so multiple accessories can be managed from one location.
• Pre-wired block: Comes assembled with relays and fuse holders to save time and reduce wiring errors during installation.
• Mixed relay types: Includes five 5-pin relays and one 4-pin relay rated 40A to handle common automotive loads.
• Six blade fuses included: Supplied with ATC/ATO fuses in 5A, 10A, 15A, 20A, 25A and 30A values for immediate circuit protection.
• Waterproof and dustproof case: Insulating top and bottom covers plus a cable opening help protect connections from splashes and debris.
• Mounting brackets: Side brackets and included hardware allow secure installation inside vehicle cabins, engine bays or boats.

Who It's For

The Nilight relay box suits DIYers, installers and small workshop owners who need to add or organize up to six switched 12V circuits without fabricating a custom harness. It is practical for adding auxiliary lights, horns, pumps or other accessories where a neat, fused relay center reduces clutter and improves serviceability.

Those who should look elsewhere include users needing higher amperage relays or custom connector types not supported by ATC/ATO blades, and installers who require integrated circuit breakers or sealed OEM-style connectors for extreme marine immersion or off-road submersion use.

Pros & Cons

Pros

• Pre-wired layout and included relays and fuses make installation quicker and reduce wiring mistakes.
• Compact, waterproof insulating case keeps multiple circuits organized and protected from dust and splashes.
• Range of fuse values and mixed relay pins provide flexibility for common 12V vehicle applications.
• Mounting brackets and hardware make it easy to secure the block in many locations.

Cons

• Relays are rated at 40A and use blade fuses, so this kit is not intended for very high-current circuits beyond that rating.
• Connections are not OEM sealed multi-pin connectors, which may be less suited for extreme marine immersion environments.

Specifications

Product type	Pre-wired fuse relay block
Voltage	12V
Relay slots	6 (5 x 5-pin, 1 x 4-pin)
Relay rating	40A
Fuse slots	6 ATC/ATO blade fuses (5A,10A,15A,20A,25A,30A)
Enclosure	Insulating, top and bottom waterproof covers
Mounting	Side brackets with screws and nuts included

Our Verdict

The Nilight 12V fuse relay box is a solid value for anyone who needs a neat, pre-wired relay center for multiple 12V circuits. It saves installation time, consolidates fuses and relays in a waterproof housing, and includes a useful range of fuses and relays for common automotive and marine accessory work. For standard accessory loads it is a practical, affordable way to bring order to wiring and protect circuits.

Frequently Asked Questions

Can this box handle heavy loads like winches?
Answer: The relays are 40A rated, so it is suitable for many accessories but not recommended for continuous heavy loads such as winches that draw above the relay rating.

Are the fuses replaceable?
Answer: Yes, the kit includes ATC/ATO blade fuses and the fuse slots accept the same type for replacement or reconfiguration.

Is the enclosure waterproof for marine use?
Answer: The insulating case with top and bottom covers protects against splashes and dust, but it does not provide guaranteed protection for prolonged immersion or fully submersible situations.