--- 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: "171.24 DT" currency: TND in_stock: true reviews_count: 5 category: "Nilight" url: https://www.desertcart.tn/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking store_origin: TN region: Tunisia --- # 40A high current switching 5-pin plug-in connector Durable premium materials 50003R Automotive Set 5-Pin 30, 40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack **Brand:** nilight **Price:** 171.24 DT **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your ride’s wiring game—power, precision, and premium quality in one pack! ## 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?** 171.24 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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-grade materials and silver alloy contacts for superior durability - • **Value-Packed 5-Pack:** Five relays and sockets included—perfect for upgrading multiple vehicle systems - • **Plug & Play Simplicity:** Unique male-female slot design ensures clean, hassle-free installation - • **Color-Coded Convenience:** Wiring harness with distinct colors for effortless, error-free setup - • **Power Up with Confidence:** Handles up to 40A/14V DC for robust automotive accessory control ## Overview The Nilight 50003R 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 slot for easy, clean installation, it includes color-coded wiring for simple setup. Made from high-grade materials with silver alloy contacts, this set ensures long-lasting performance and reliable power delivery for automotive lighting and accessories. ## Description Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack Review: Good value, well made, - Nice packet of 12v 5-Pin automotive relays with attached pigtail connectors. Appear well made, well marked, good materials used and have built in mounting tabs which are a plus. Nice 30/40 Amp rated, comparable with most common 5-Pin 12V relays found on automotive accessory devices. Easy to install using the pigtail wiring instead of having to make individual connectors. The 5 pack is a good value for anyone adding accessories like lighting to a vehicle. Review: Bien producto - El arnés se ve de buena calidad, el cable que tiene es grueso, los relay entran justo en el arnes, hay que ver cuánto duran los relay ## 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 | |---------------|-------| | ASIN | B0748F1JK4 | | Best Sellers Rank | 442,254 in Automotive ( See Top 100 in Automotive ) 1,812 in Car Relays | | Brand | Nilight | | Coil Resistance | 50 Milliohms | | Coil Voltage | 12 Volts | | Connector Type | Plug-In | | Connector type | Plug-In | | Contact Current Rating | 40 Amps | | Contact Material | Silver Alloy | | Contact Type | nc,nc/40a,normally open | | Contact material | Silver Alloy | | Contact type | nc, nc/40a, normally open | | Current Rating | 40 Amps | | Current rating | 40 Amps | | Customer Reviews | 4.6 out of 5 stars 3,282 Reviews | | Global Trade Identification Number | 00600537013346 | | Included Components | 5PCS Relay Harness Set | | Item Type Name | Nilight Automotive Relay Harness Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness - 5 Pack，2 Years Warranty | | Item Weight | 0.5 Pounds | | Manufacturer | Nilight | | Manufacturer Part Number | NI-RE05 | | Maximum Switching Current | 40 Amps | | Maximum Switching Voltage | 30 Volts (DC) | | Minimum Switching Voltage | 30 Volts (DC) | | Model Number | 50003R | | Mounting Type | Surface Mount | | Mounting type | Surface Mount | | Number of Items | 1 | | Number of Packs | 5 | | Operation Mode | Automatic | | Specification Met | UL | | UPC | 600537013346 | | Unit Count | 5.0 count | | Upper Temperature Rating | 125 Degrees Celsius | | Wattage | 560 watts | ## 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good value, well made, *by T***T on 14 July 2026* Nice packet of 12v 5-Pin automotive relays with attached pigtail connectors. Appear well made, well marked, good materials used and have built in mounting tabs which are a plus. Nice 30/40 Amp rated, comparable with most common 5-Pin 12V relays found on automotive accessory devices. Easy to install using the pigtail wiring instead of having to make individual connectors. The 5 pack is a good value for anyone adding accessories like lighting to a vehicle. ### ⭐⭐⭐⭐⭐ Bien producto *by G***M on 17 November 2025* El arnés se ve de buena calidad, el cable que tiene es grueso, los relay entran justo en el arnes, hay que ver cuánto duran los relay ### ⭐⭐⭐⭐⭐ Great Value for the Money *by R***K on 9 March 2021* I bought these as for a truck project, and thank goodness I bought the 5 pack. The wires are very good thickness, easy to understand schematics, and you can pull out the wires that aren't needed (3-4-5 PIN) to complete your project. I have connectted accenting lighting to LED Bars to this relay. ## 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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking](https://www.desertcart.tn/products/256267374-50003r-automotive-set-5-pin-30-40a-12v-spdt-interlocking) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-10-18*