--- product_id: 491699536 title: "4-PIN 40/30 AMP 12 V DC Waterproof Relay Kit Harness Socket - Heavy Duty 12 AWG Tinned Copper Wires, Automotive Relays for Boats Auto Fan Cars 4-PIN SPST 12V Automotive Relay Harness Set" brand: "daymaker" price: "R321" currency: ZAR in_stock: true reviews_count: 13 category: "Daymaker" url: https://www.desertcart.co.za/products/491699536-4-pin-40-30-amp-12-v-dc-waterproof-relay store_origin: ZA region: South Africa --- # 40A/30A high current capacity IP67 waterproof sealed relay Heavy-duty 12 AWG tinned copper wires 4-PIN 40/30 AMP 12 V DC Waterproof Relay Kit Harness Socket - Heavy Duty 12 AWG Tinned Copper Wires, Automotive Relays for Boats Auto Fan Cars 4-PIN SPST 12V Automotive Relay Harness Set **Brand:** daymaker **Price:** R321 **Availability:** ✅ In Stock ## Summary > ⚡ Stay powered, stay protected—relay like a pro! ## Quick Answers - **What is this?** 4-PIN 40/30 AMP 12 V DC Waterproof Relay Kit Harness Socket - Heavy Duty 12 AWG Tinned Copper Wires, Automotive Relays for Boats Auto Fan Cars 4-PIN SPST 12V Automotive Relay Harness Set by daymaker - **How much does it cost?** R321 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/491699536-4-pin-40-30-amp-12-v-dc-waterproof-relay) ## Best For - daymaker enthusiasts ## Why This Product - Trusted daymaker brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Premium Connectivity:** Includes a plug-and-play 4-pin SPST relay socket with quick-connect terminals and a metal mounting tab for effortless installation. - • **Weatherproof Warrior:** IP67-rated waterproof sealing ensures flawless performance in rain, mud, and marine environments—never worry about corrosion or water damage. - • **Versatile Control Hub:** Perfect for power door locks, trunk releases, fans, motors, and overload protection—your all-in-one relay solution for automotive and boat electronics. - • **Power Through Anything:** Handles up to 40 amps with a 30A continuous rating—built for high-demand automotive and marine applications. - • **Durability Meets Precision:** Heavy-duty 12 AWG tinned copper wires resist oxidation and corrosion, guaranteeing long-lasting, reliable electrical connections. ## Overview This 4-PIN 12V DC waterproof relay kit features a robust 40A/30A SPST relay with IP67 sealing and heavy-duty 12 AWG tinned copper wiring. Designed for automotive and marine use, it offers reliable, corrosion-resistant performance for controlling motors, fans, locks, and more, with easy plug-in installation and superior durability. ## Description Buy 4-PIN 40/30 AMP 12 V DC Waterproof Relay Kit Harness Socket - Heavy Duty 12 AWG Tinned Copper Wires, Automotive Relays for Boats Auto Fan Cars 4-PIN SPST 12V Automotive Relay Harness Set: Accessory Power - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: they worked just fine - i only needed the relays from this kit, they plugged right into my top end wiring harness that i already had install. they are still working several month later with no problems. Review: Works - Works as it should ## Features - 【Function】: 12VDC (14V Max) waterproof 4-Pin SPST (Single Pole Single Throw) Relay with 40A/30A high current carrying capacity, heavy-duty make/break relay. But never go beyond its capabilities, try to stay 10 to 15% below what the rate is for. Widely used in car keys power control, over-load protection, trunk release, power door lock/actuator control, control motors/other electronics etc. - 【Premium Material】: Durable relay and harness socket with 4 wires; made from high-grade materials to ensure superior quality and long lifespan. Built-in tinned wire makes it can be stored without concern due to its better performance in corrosion resistance and oxidation resistance. - 【Weatherproof Relay】:The Waterproof relay tightly sealed with strong cap and seal ring, excellent performance of waterproof, to be used on off-road vehicles, boats, and dirt track cars that are often exposed to wet or muddy conditions. - 【Wire Specifications】: White - Ground (85), Red - VDC (30), Black - Trigger (86), Blue - Output N/C (87). The purchase includes the relay itself and a relay socket/harness with wires. Metal mounting tab is present on the relay for ease of installation. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BDGLBDCT | | Best Sellers Rank | #163,527 in Automotive ( See Top 100 in Automotive ) #249 in Automotive Replacement Accessory Power Relays | | Brand Name | DAYMAKER | | Coil Resistance | 80 Ohms | | Coil Voltage | 12 Volts | | Connector Type | Quick Connect | | Contact Current Rating | 30 Amps | | Contact Material | Copper | | Contact Type | Normally Closed | | Current Rating | 30 Amps | | Customer Reviews | 4.8 4.8 out of 5 stars (75) | | Included Components | NO | | Manufacturer | DAYMAKER | | Maximum Switching Current | 30 Amps | | Minimum Switching Voltage | 6 Volts (DC) | | Mounting Type | Plug In Mount | | Operation Mode | Automatic | | Part Number | A05RH04P | | Specification Met | IP67 | | UPC | 782279894466 | | Wattage | 1.8 watts | ## Product Details - **Connector Type:** Quick Connect - **Contact Material:** Copper - **Contact Type:** Normally Closed - **Current Rating:** 30 Amps - **Mounting Type:** Plug In Mount ## Images ![4-PIN 40/30 AMP 12 V DC Waterproof Relay Kit Harness Socket - Heavy Duty 12 AWG Tinned Copper Wires, Automotive Relays for Boats Auto Fan Cars 4-PIN SPST 12V Automotive Relay Harness Set - Image 1](https://m.media-amazon.com/images/I/71KT8RgKf8L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ they worked just fine *by C***R on January 30, 2026* i only needed the relays from this kit, they plugged right into my top end wiring harness that i already had install. they are still working several month later with no problems. ### ⭐⭐⭐⭐⭐ Works *by R***Y on November 22, 2025* Works as it should ### ⭐⭐⭐⭐⭐ My extra accessory light circuit is hooked up safer now. *by T***M on October 1, 2025* Very Good results from using this. Thanks ## Frequently Bought Together - 4-PIN 40/30 AMP 12 V DC Waterproof Relay Kit Harness Socket - Heavy Duty 12 AWG Tinned Copper Wires, Automotive Relays for Boats Auto Fan Cars 4-PIN SPDT Bosch Style 12V Automotive Relay Harness Set - 10 Gauge Fuse Holder - 10 AWG Inline Fuse Holder with 40 AMP ATC Blade Fuses (4pack) - AUTOWIRING Automotive Hi-Flex 110 Amp 16mm² Battery/Starter/Inverter/Welding PVC Cable Wire (Red, 10 Metre) --- ## 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.co.za/products/491699536-4-pin-40-30-amp-12-v-dc-waterproof-relay](https://www.desertcart.co.za/products/491699536-4-pin-40-30-amp-12-v-dc-waterproof-relay) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-06-03*