12V Fuse Relay Switch Harness Set with 30A Blade Fuse – 4-Pin SPST Automotive Relays with Built-in Fuse Holder, Heavy Duty 12 AWG Wires, Interlocking Mount (2)

Price: £7.99
(as of Sep 27, 2025 20:30:17 UTC – Details)


Upgrade your vehicle’s electrical system with this 12V Fuse Relay Switch Harness Set, designed to simplify installation and provide reliable performance in a wide range of automotive applications. This pack of 3 high-performance relays features a built-in 30A ATO/ATC blade fuse, eliminating the need for separate fuse holders. This space-saving design streamlines your wiring setup, making it easier to install while saving both time and money.
Each relay comes equipped with heavy-duty 12 AWG wires for the main contacts, providing a durable and secure connection for high-current loads such as car lights, fog lamps, starters, fans, and more. The color-coded wiring makes installation even more convenient, with Black for ground (85), Red for power (30), White for trigger (86), and Blue for output (87). This user-friendly design ensures a hassle-free setup, even for those with limited electrical experience.
The relays also feature a unique interlocking design that allows you to neatly connect multiple relays together using the male-female slots on each socket edge. This interlocking system not only keeps your wiring organized but also ensures a clean, professional appearance in your vehicle’s electrical setup. Whether you’re working on a custom wiring project or simply upgrading your existing system, this feature provides flexibility and ease of use.
These 4-pin SPST Bosch-style relays are designed to handle up to 30A of current at 12-14V DC, making them suitable for a wide variety of applications, including car lights, wipers, fans, speakers, and traction control systems. The durable metal mounting bracket attached to each relay ensures that installation is quick and secure, allowing you to mount the relays in a convenient location within your vehicle.
Built for versatility, these relays are perfect for automotive enthusiasts, electricians, and anyone looking to improve the performance and reliability of their vehicle’s electrical system. Whether you’re installing new car lights, fog lamps, or starters, these relays deliver consistent performance and long-lasting durability, even in demanding conditions.
With a wide range of applications, this Fuse Relay Switch Harness Set is an essential addition to any automotive electrical toolkit. Whether you’re a professional mechanic or a DIY enthusiast, these relays provide the high-quality performance you need to complete your projects with confidence.
Upgrade your vehicle’s electrical system with this reliable, easy-to-install 12V relay set and enjoy the benefits of enhanced performance and simplified wiring.
UPGRADED SPACE-SAVING DESIGN: Each automotive relay in this set comes with a built-in fuse socket and 30A ATO/ATC blade fuse, eliminating the need for a separate fuse holder. This efficient design saves space and simplifies installation, making it an ideal solution for vehicle electrical systems.
EASY COLOR-CODED WIRING: Wiring your relays is effortless with the included color-labeled wires: Black for ground (85), Red for power (30), White for trigger (86), and Blue for output (87). The heavy-duty 12 AWG wires ensure a reliable connection for high-current loads and accessories.
INTERLOCKING MOUNTING SYSTEM: Designed for neat and organized installation, the relays feature an interlocking male-female slot system on each socket edge. This allows you to easily connect and secure multiple relays together, providing a clean and streamlined setup in any automotive project.
HIGH-PERFORMANCE RELAYS: These 4-pin SPST Bosch-style relays offer excellent switching capability with 30A and up to 14V DC. Each relay includes a durable metal mounting bracket for quick and easy installation, making them ideal for controlling a variety of automotive devices.
WIDE APPLICATIONS: Suitable for a wide range of automotive applications, these relays are perfect for controlling car lights, fog lamps, starters, fans, speakers, wipers, traction control systems, and more. The heavy-duty design ensures long-lasting performance even in demanding conditions.