12V 40A Automotive Relay Fuse Box - Pre-Wired Modular 3-Slot Block

Package Includes

1 x Modular Relay & Fuse Socket Block

1 x 4-Pin 12V 40A JD1912 Relay

3 x  Blade Fuse (1 x 10A, 1 x 20A, 1 x 30A)

1 x Stainless Steel Mounting Screw

Product Features

Independent Triple-Fused Protection: This triple-slot blade fuse block distributes a single primary battery feed into three independently protected accessory circuits. Three included ATC/ATO blade fuses (10A, 20A, 30A) safeguard sensitive lighting bars, fog lamps, and auxiliary horns against sudden electrical shorts.

Heavy-Duty 40A Switching: The pre-installed 12V 40A JD1912 automotive relay uses a robust 4-pin SPST contact configuration to handle high-power current spikes safely. This heavy-duty switching unit allows low-current interior dash toggles to safely control demanding exterior auxiliary devices.

Pre-Wired Color-Coded Harness: Color-coded pure copper lead wires arrive fully seated into the underside terminals to eliminate tedious manual pin crimping. The organized harness layout uses dedicated wire colors for battery positive, ground, trigger switch, and accessory load lines.

Interlocking Modular Expandability: Built-in lateral interlocking slide tracks allow multiple single blocks to snap together seamlessly into a customized multi-channel bank. This modular expandable design lets installers add extra switched circuits over time while maintaining a clean, factory-style appearance.

Compact Engine-Bay Profile: The compact 2.36" x 1.99" x 1.35" nylon housing tucks easily into crowded engine compartments, under dashboards, or inside RV battery boxes. An integrated mounting tab with a stainless screw provides a secure, vibration-resistant anchor point on trucks, ATVs, cars, and marine vessels.

Technical Specifications