---
product_id: 279157942
title: "30/40A 12V SPDT Relay"
brand: "nilight"
price: "$2322"
currency: MXN
in_stock: null
reviews_count: 7
category: "Nilight"
url: https://www.desertcart.mx/products/279157942-30-40a-12v-spdt-relay
store_origin: MX
region: Mexico
---

# 40A/14V DC high switching power Unique male-female slot design 5-wire harness with color-coded sockets 30/40A 12V SPDT Relay

**Brand:** nilight
**Price:** $2322
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Elevate your ride’s electrical game with effortless power and style!

## Quick Answers

- **What is this?** 30/40A 12V SPDT Relay by nilight
- **How much does it cost?** $2322 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/279157942-30-40a-12v-spdt-relay)

## 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 a long operational lifespan
- • **Plug & Play Precision:** Innovative male-female slot design ensures seamless, mess-free installation
- • **Color-Coded Convenience:** Simplifies wiring with distinct colors for quick, error-free setup
- • **Complete 5-Pack Solution:** Includes 5 relays and sockets—ready to upgrade multiple circuits at once
- • **Power Up with Confidence:** Handles up to 40A at 14V DC for heavy-duty automotive needs

## Overview

The Nilight 30/40A 12V SPDT Relay 5-pack offers robust switching capacity with 40A normally open and 30A normally closed ratings at 14V DC. Designed for universal automotive applications, it features a durable 5-wire harness with color-coded sockets and a unique male-female slot design for quick, clean installation. Crafted from premium materials, this relay set ensures long-lasting performance and comes with a 2-year warranty, making it a trusted choice for professional-grade vehicle wiring upgrades.

## Description

Buy Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack, 2 Years Warranty online on desertcart.ae at best prices. ✓ Fast and free shipping ✓ free returns ✓ cash on delivery available on eligible purchase.

Review: Nice quality - The good thing about it it have a built-in fuse which make life easier, and a relief of the wiring hassle. So far no issues with the relay.
Review: Fix the images - Carefull some misslabeling in one image that confuses common trigger wire and positive source. Ur relay will still work but you will be pulling power from wrong side. Best read the numbers on the relays and trace the wires

## 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.Fit type: Universal fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0748F1JK4 |
| Best Sellers Rank | #3,553 in Automotive ( See Top 100 in Automotive ) #4 in Car Electrical Wiring Harnesses |
| Brand | Nilight |
| Customer Reviews | 4.6 4.6 out of 5 stars (7,652) |
| Date First Available | 6 September 2017 |
| Exterior | Painted |
| Item Weight | 227 g |
| Item model number | 50003R |
| Lift Type | Automatic |
| Manufacturer | Nilight |
| Manufacturer Part Number | NI-RE05 |
| Model | 50003R |
| Product Dimensions | 12.7 x 5.08 x 12.7 cm; 226.8 g |
| Wattage | 560 watts |

## Product Details

- **Connector type:** Plug-In
- **Contact material:** Silver Copper
- **Contact type:** Normally Open
- **Current rating:** 40 Amps
- **Mounting type:** Surface Mount

## Images

![30/40A 12V SPDT Relay - Image 1](https://m.media-amazon.com/images/I/51Zyl0TZLLL.jpg)
![30/40A 12V SPDT Relay - Image 2](https://m.media-amazon.com/images/I/614N9SFLlrL.jpg)
![30/40A 12V SPDT Relay - Image 3](https://m.media-amazon.com/images/I/61NYNh3T6UL.jpg)
![30/40A 12V SPDT Relay - Image 4](https://m.media-amazon.com/images/I/61QfU5CpR+L.jpg)
![30/40A 12V SPDT Relay - Image 5](https://m.media-amazon.com/images/I/61R3vk8vhtL.jpg)

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice quality
*by F***N on 2 April 2024*

The good thing about it it have a built-in fuse which make life easier, and a relief of the wiring hassle. So far no issues with the relay.

### ⭐ Fix the images
*by D***A on 15 December 2023*

Carefull some misslabeling in one image that confuses common trigger wire and positive source. Ur relay will still work but you will be pulling power from wrong side. Best read the numbers on the relays and trace the wires

### ⭐⭐⭐⭐⭐ Review
*by H***Y on 6 July 2012*

I bought this relay to put on my Chevy Truck for some new 10" Electric Radiator fans. I live in the Desert and it gets pretty hot around here. When I run the AC at an Idle the AC was struggling. So I added these fans and I needed a good relay to handle the amps and not get wet. This relay does the trick. So far I have had no problems and the AC works like a charm. One thing I did notice is that the picture shows a metal bracket and the one I got was just plastic. I would have preferred one with a metal bracket but oh well. Other than that it does what it should. I hope it last as only time will tell. UPDATE 9-9-13: Well it has been a year and this little relay is still going strong. Arizona heat has nothing on this relay..... UPDATE: 1-1-2015 So here we are over two years and this thing still rocks.

## 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
- 10 Pack Inline Fuse Holder 12V, Professional 12 AWG Waterproof Fuse Holder with 35 Pcs (5A/7.5A/10A/15A/20A/30A/40A) Standard Car Fuses, Giwiemi in Line Fuses Holders 12v for Marine Auto and Circuits
- 12 AWG Inline Fuse Holder - 12 Gauge Fuse Holder for 30A Blade Fuse (6 Pack)

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**Shop now:** [https://www.desertcart.mx/products/279157942-30-40a-12v-spdt-relay](https://www.desertcart.mx/products/279157942-30-40a-12v-spdt-relay)

---

*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-01-25*