---
product_id: 256267374
title: "50003R Automotive Set 5-Pin 30, 40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack"
brand: "nilight"
price: "A$52"
currency: AUD
in_stock: true
url: https://www.desertcart.com.au/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking
store_origin: AU
region: Australia
---

# 40A high switching power Color-coded wiring for easy install 5-pin interlocking socket 50003R Automotive Set 5-Pin 30, 40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack

**Brand:** nilight
**Price:** A$52
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your ride’s wiring game with Nilight’s pro-grade relay set!

## Quick Answers

- **What is this?** 50003R Automotive Set 5-Pin 30, 40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack by nilight
- **How much does it cost?** A$52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking)

## Best For

- nilight enthusiasts

## Why This Product

- Trusted nilight brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to last:** Premium materials guarantee durability and long lifespan
- • **Complete 5-pack:** Everything you need for multiple installations in one set
- • **Plug & play design:** Unique male-female slots ensure seamless, mess-free connections
- • **Color-coded clarity:** Simplifies wiring with intuitive color differentiation
- • **Power-packed switching:** Handles up to 40A/14V DC for heavy-duty LED setups

## Overview

The Nilight50003R is a 5-pack automotive relay and wiring harness set featuring 5-pin SPDT relays rated for 40A/14V DC switching. Designed with a unique male-female interlocking socket and color-coded wires, it ensures easy, clean installation and reliable performance for LED light bar wiring and other automotive electrical needs.

## Description

Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack.

## Features

- High switching capability: Normally open 40A/14V DC and normally close 30A/14V DC; suitable for Nilight LED light bar wiring harness kit
- Premium quality: Durable relay and harness socket with 5 wires; made by high-grade materials to ensure superior quality and long lifespan
- Male-female slot design: Unique male-female slot design, easy to connect the relay with harness socket, clean and neat after installation
- Easy wiring: The relay sockets come with different colors for loads/accessories, simple and convenient wiring
- Package include: 5 x relay and 5 x relay socket with wires

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Nilight |
| Brand | Nilight |
| Model | 50003R |
| Product Dimensions | 12.7 x 5.08 x 12.7 cm; 226.8 g |
| Item model number | 50003R |
| Exterior | Painted |
| Manufacturer part number | NI-RE05 |
| Lift type | Automatic |
| Wattage | 560 watts |
| Item Weight | 227 g |

## Product Details

- **Connector type:** Plug-In
- **Contact material:** Silver Alloy
- **Contact type:** nc,nc/40a,normally open
- **Current rating:** 40 Amps
- **Mounting type:** Surface Mount

## Images

![50003R Automotive Set 5-Pin 30, 40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack - Image 1](https://m.media-amazon.com/images/I/61QfU5CpR+L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: How long will this last with constant on and off pulses**
A: Mechanical (at 7,200 ops./h): 10,000,000
Electrical (at 600 ops./h): 100,000

**Q: Is it possible to remove the metal mounting bracket so it can be used in a relay box?**
A: The mounting tab can easily be removed however I don’t know if they would fit in a relay box

**Q: I am looking for turn signal relay to correct hyper-flash with led bulbs on 2012 Honda Fit, with out having to put resistor at each location ???**
A: Go to a truck stop and get an electronic flasher,it doesn't care how many lights you have in the system or how few.

**Q: I want to use this to power my cooling fan when the ignition key is turned. If I wire off the battery will it work?**
A: As long as
1. You wire the common (terminal 30) to your fan+, and
2. You wire NO (terminal 87) to VBat (through a fuse),

You should be fine.  That is pretty much how my car has these relays wired from the factory for the radiator fans.  I assume you will connect terminal 85 to VBat through a fuse, and your ignition-control wire is a ground-interrupt connected to terminal 86 (otherwise, if your ignition-on wire is +12V/hot, you will want to connect it through a fuse to terminal 85, and simply ground terminal 86).  I seem to recall these solenoid coils pull about 130mA at 12V when I tested them.

## Frequently Bought Together

- Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack, 2 Years Warranty
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- 12 AWG Inline Fuse Holder - 12 Gauge Fuse Holder for 30A Blade Fuse (6 Pack)

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**Shop now:** [https://www.desertcart.com.au/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking](https://www.desertcart.com.au/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-07*