Unique-Bargains DC 12V 40A SPDT 5-Pin Relay with Harness Socket 5pcs

Automotive 12 V 40 A SPDT relay kit

This pack contains five 12 volt relays rated for 40 amps each with a single-pole double-throw contact arrangement. Each unit includes a pre-wired harness socket that accepts standard female spade terminals. The interlocking harness design allows multiple sockets to be coupled together for tidy installation. The kit suits automotive accessory circuits such as lighting, audio triggers and door-lock actuators.

Check vehicle wiring and load requirements

Verify that the circuit you intend to switch operates on a 12 volt supply and that the total current draw stays within the 40 amp contact rating. Confirm the pin-out matches your wiring plan: pin 30 is the power input, pins 85 and 86 are the coil connections, pin 87 is the normally open output and pin 87a is the normally closed output. Ensure the existing harness can accept the supplied female spade terminals without modification.

Pre-wired sockets with interlocking harness

Each relay plugs into a dedicated socket that arrives with five colour-coded wires already terminated to the correct pins. The sockets feature an interlocking moulding so additional units can be snapped together, keeping the loom organised in tight engine-bay or dash spaces. The SPDT contact layout lets you choose normally open or normally closed operation per circuit simply by selecting the appropriate output wire.