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Five black 12V 40A SPDT relays with matching five-wire harness sockets

Unique-Bargains

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

SKU CH-1X8E-KZSEJ

Pack of five 12 V 40 A SPDT relays with pre-wired harness sockets for normally open or normally closed circuits

  • FeaturesCar Relay;Relay Socket;SPDT Relay Socket Plug;Car Relay with
  • 12 V DC relay switches up to 40 A loads
  • SPDT contacts allow normally open or normally closed wiring
  • Pre-wired 5-pin harness socket speeds installation
  • Colour-coded wires match standard pin layout 30 85 86 87 87a
  • Interlocking sockets couple together for tidy multi-relay setups

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.

Highlights

  • 12 V DC relay switches up to 40 A loads
  • SPDT contacts allow normally open or normally closed wiring
  • Pre-wired 5-pin harness socket speeds installation
  • Colour-coded wires match standard pin layout 30 85 86 87 87a
  • Interlocking sockets couple together for tidy multi-relay setups

Specifications

BrandUnique Bargains
FeaturesCar Relay;Relay Socket;SPDT Relay Socket Plug;Car Relay with Socket;5 Pin Relay with Harness Socket

Questions about this item

What comes in the 5-piece pack and is any extra wiring needed?

The pack contains five 12 V 40 A SPDT relays and five pre-wired sockets with colour-coded leads for pins 30, 85, 86, 87 and 87a, so no separate harness is required.

How do I decide between using the normally open or normally closed output on each relay?

Pin 87 (red wire) gives a normally open contact that closes when the coil is energised; pin 87a (blue wire) gives a normally closed contact that opens when the coil is energised — choose the wire that matches the circuit behaviour you need.

What does the 40 A rating mean when the relay is installed in a 12 V vehicle circuit?

It indicates the maximum continuous current the contacts can switch at 12 V, suitable for loads such as fog lights, horns or door-lock actuators up to that limit.

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