--- product_id: 259049339 title: "OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires" brand: "online led store" price: "£40.89" currency: GBP in_stock: true reviews_count: 5 category: "Online Led" url: https://www.desertcart.co.uk/products/259049339-ols-5-pack-40-30-amp-waterproof-relay-switch-harness store_origin: GB region: United Kingdom --- # 40A/30A high current rating Waterproof build Heavy-duty 12AWG wiring OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires **Brand:** online led store **Price:** £40.89 **Availability:** ✅ In Stock ## Summary > ⚡ Stay powered, stay unstoppable — the ultimate relay harness for pros who demand more. ## Quick Answers - **What is this?** OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires by online led store - **How much does it cost?** £40.89 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/259049339-ols-5-pack-40-30-amp-waterproof-relay-switch-harness) ## Best For - online led store enthusiasts ## Why This Product - Trusted online led store brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Precision:** Bosch-style 5-pin SPDT relay with clear wire color coding for seamless installation. - • **Power That Packs a Punch:** Handles up to 40 Amps switching capacity for demanding automotive and marine applications. - • **Built to Brave the Elements:** Waterproof construction ensures reliable performance in wet, muddy, or off-road conditions. - • **Complete 5-Pack Set with Warranty:** Includes 5 relays and harnesses backed by a 1-year manufacturer warranty for peace of mind. - • **Heavy-Duty Wiring for Maximum Safety:** Robust 12AWG hot wires minimize voltage drop and heat buildup under load. ## Overview The OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set features Bosch-style 5-pin SPDT relays with heavy-duty 12AWG wiring and waterproof construction. Designed for 12V DC systems, it supports high current loads up to 40 Amps, making it ideal for off-road vehicles, boats, and rugged automotive use. Each set includes 5 relays with harnesses, a metal mounting tab for easy installation, and a 1-year warranty, ensuring durability and reliability in harsh environments. ## Description The OLS PSZACCEPS178R 5-pin Bosch Style SPDT 12V DC 40A/30A waterproof automotive relay is the ideal electrical relay to be used on off-road vehicles, boats, and dirt track cars that are often exposed to wet or muddy conditions. 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. Set includes 5 relays and 5 relay harness.Interchangeable/Compatible with:All automobiles and devices equipped with a 12 Volt DC power source.Features:Waterproof construction.Bosch style 5-Pin SPDT (Single Pole Double Throw) Relay.40A/30A High Switching Capability.Wire Specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86), Yellow - Output N/C (87a), and Blue - Output N/O (87).Product Content:5 x Relays1 Year Manufacturer WarrantyHave a Question? Call Us Toll Free 1-855-LED-ONLINE (1-855-533-6654) Review: Thanks this product was exactly what we wanted. Thanks again Review: good quality product saves a fortune using this with transistor and some wire. Cheap fix bi passing startup air mix removed all warning lights and got truck out of limp mode.Youtube is a lifesaver! ## Features - User Manual available for download under Product Information Details - Waterproof construction & heavy duty 12AWG wires for the main contact. - Bosch style 5-Pin SPDT (Single Pole Double Throw) Relay. - 12VDC (14V Max) and 40A/30A High Switching Capability. - Wire Specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86), Yellow - Output N/C (87a), and Blue - Output N/O (87). ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01MTQNJKM | | Brand | ONLINE LED STORE | | Coil Voltage | 12 Volts | | Connector Type | Through Hole | | Contact Material | Silver Tin Oxide | | Contact Type | Normally Open | | Current Rating | 40 Amps | | Customer Reviews | 4.6 4.6 out of 5 stars (1,453) | | Item Weight | 1.14 Pounds | | Manufacturer | ONLINE LED STORE | | Manufacturer Part Number | PSZACCEPS178R | | Minimum Switching Voltage | 12 Volts | | Mounting Type | Panel Mount | | Operation Mode | Manual | | UPC | 816165023873 | | Wattage | 480 watts | ## Product Details - **Connector type:** Through Hole - **Contact material:** Silver Tin Oxide - **Contact type:** Normally Open - **Current rating:** 40 Amps - **Mounting type:** Panel Mount ## Images ![OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires - Image 1](https://m.media-amazon.com/images/I/81AsjKnDmCL.jpg) ![OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires - Image 2](https://m.media-amazon.com/images/I/71RuGR+onpL.jpg) ![OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires - Image 3](https://m.media-amazon.com/images/I/81ReNQjiP4L.jpg) ![OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires - Image 4](https://m.media-amazon.com/images/I/616KNg6l6fL.jpg) ![OLS 5 Pack 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires - Image 5](https://m.media-amazon.com/images/I/71bXno+c8hL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by I***S on 6 July 2021* Thanks this product was exactly what we wanted. Thanks again ### ⭐⭐⭐⭐⭐ Review *by P***T on 27 November 2024* good quality product saves a fortune using this with transistor and some wire. Cheap fix bi passing startup air mix removed all warning lights and got truck out of limp mode.Youtube is a lifesaver! ### ⭐⭐⭐⭐⭐ Review *by S***S on 8 January 2026* Outstanding module, this was able to quickly and efficiently help me wire a new horn to my truck safely. Would buy again. ## Frequently Bought Together - True MODS 5 Pack 5-Pin 12V Bosch Style Waterproof Relay Kit [Harness Socket] [12 AWG Hot Wires] [SPDT] [30/40 Amp] 12 Volt Automotive Marine Relays for Boats Auto Fan Cars - 10 Gauge Fuse Holder - 10 AWG Inline Fuse Holder with 40 AMP ATC Blade Fuses (4pack) - MCIGICM 12 AWG Inline Fuse Holder with 30A ATC/ATO Blade Fuse, 5 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.co.uk/products/259049339-ols-5-pack-40-30-amp-waterproof-relay-switch-harness](https://www.desertcart.co.uk/products/259049339-ols-5-pack-40-30-amp-waterproof-relay-switch-harness) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-23*