Relay

The QUICKCAR Racing Products 40-amp relay switch (model 57-750) is a universal 12-volt electrical control component built to handle high-amperage loads in automotive and marine electrical systems. This is the standard relay specification for serious racers, restoration shops, and boat builders who need reliable switching for fuel pumps, cooling fans, winches, and auxiliary power circuits where factory wiring cannot safely handle the current demand.

At 40 amps continuous, this relay is rated to control high-current devices without voltage drop or relay chatter. The 12-volt design matches standard automotive and marine electrical systems. Compact dimensions (3.5 × 1.5 × 4.5 inches) and minimal weight (0.09 lbs) make it simple to mount in tight engine bays or console spaces. The universal pin configuration allows integration into most aftermarket wiring harnesses and custom electrical builds without modification.

This relay is ideal for fuel injection tuning, electric cooling fan upgrades, high-output alternator circuits, and offshore fishing boats running powerful pump and accessory systems. Weekend mechanics and professional installers rely on this specification when factory relays are undersized for modified or auxiliary loads. Whether upgrading a street rod's electrical infrastructure or powering a marine bilge pump and circulation system, the 57-750 delivers the switching capacity and durability expected from QUICKCAR Racing Products.

Each relay is sold individually, allowing builders to order the exact quantity needed for their project. Verify pin layout against your wiring harness diagram before installation to ensure correct control circuit and load circuit connections.