40 Amp Relay

The KC HILITES 40 Amp Relay (Model 3300) is a 12-volt electrical relay switch engineered for high-amperage lighting circuits found in off-road, emergency response, and auxiliary lighting applications. This compact relay operates at 40 amps continuous capacity, making it suitable for controlling multiple LED or HID light bars, flashers, and auxiliary lamp arrays without voltage drop or relay chatter that compromises switching integrity.

Rated for 12-volt DC systems, the relay maintains stable contact closure across the full 40-amp specification, eliminating the need for oversized gauge wiring directly from battery to light source. The 4.05-inch length and compact 2.55 x 1.55-inch profile fit standard automotive relay mounting locations, engine bays, and fuse block housings. At 0.11 lbs, weight is negligible, reducing burden on mounting hardware. The sealed relay housing protects internal contacts from moisture ingress, critical in salt-air environments, high-humidity climates, and vehicle wash exposure.

This 40-amp relay is purpose-built for off-road enthusiasts, emergency vehicle outfitters, and custom 4x4 fabricators seeking reliable control of roof-mounted light arrays, bumper-integrated LED bars, chase lights, and signal flashers. KC HILITES relays are foundational components in lighting harness design, protecting delicate switch circuits in the cabin while allowing maximum amperage delivery to high-demand fixtures. Whether configuring a secondary lighting system or upgrading auxiliary circuits on trucks, Jeeps, and SUVs, the 3300 relay delivers repeatable switching without failure.