APIELE 4-Pin 12V 40A Fused Relay Kit — 6-Pack with 30A Fuse & 14 AWG Harness, SPST Normally Open

APIELE's 4-pin 12V 40A fused relay is a compact, SPST normally-open automotive relay with an integrated 30A blade fuse and a heavy-duty 14 AWG harness socket, sold as a 6-pack for plug-and-play vehicle electrical upgrades.

This fused relay kit combines a standard 4-pin SPST switching relay (1NO) with a built-in fuse holder and a robust wiring socket, making it easier to add protected high-current circuits to cars, trucks, and other 12V systems. Each unit is rated to switch up to 40A at 13.5V DC and ships with a 30A blade fuse, metal mounting bracket, and a four-wire socket with heavy 14 AWG hot lead for reliable power delivery. The compact design follows common automotive relay pinouts so it integrates with aftermarket accessories and OEM-style wiring.

How does this relay protect my aftermarket accessories?

The relay separates the high-current circuit from your vehicle's control switch or ECU, while the included blade fuse interrupts excessive current to prevent wiring damage. Because the fuse is installed at the relay socket, it protects both the relay output and downstream wiring without extra fuse holders.

• Built-in 30A blade fuse interrupts overloads quickly
• 14 AWG heavy-duty hot wire minimizes voltage drop
• SPST (1NO) isolates load from control circuit
• Metal bracket secures relay and reduces vibration

What wiring and pin layout should I expect when installing it?

The relay follows the common 4-pin automotive pin numbering: 85 for ground, 86 for trigger/coil positive, 30 for constant power input, and 87 for the switched output. The included four-wire socket makes it simple to attach power, ground, trigger, and the load without soldering or specialty connectors.

• Pin 85: ground to vehicle chassis or negative circuit
• Pin 86: trigger input from switch or control module
• Pin 30: fused constant 12V power feed
• Pin 87: fused switched output to the accessory or motor

Will this relay handle motors, locks, or lighting accessories?

Yes — the 40A switching capability at typical automotive voltage allows it to run many motors, actuators, and lighting loads when properly fused. Match the accessory’s continuous and stall currents to the relay rating and use the supplied 30A fuse or a higher-value blade fuse as needed, keeping wiring gauge and temperature in mind.

• Suitable for power door locks, actuators, small motors, and lighting
• Use appropriate fuse value; factory ships with 30A installed
• 14 AWG harness is appropriate for most 30A circuits over short runs
• Provide good chassis ground and secure mounting to reduce heat

How does this kit simplify multi-relay installations?

Each relay comes with a mounting bracket and a removable socket so you can mount relays in a group and swap relays without cutting wires. That arrangement speeds installation and maintenance for fleets, off-road builds, or any project needing multiple protected circuits.

• Metal mounting bracket for firm, vibration-resistant mounting
• Removable relay from its socket for quick replacement
• Prewired 14 AWG hot lead reduces on-site wiring time
• Sold as a 6-pack for multi-circuit projects and spares

Who is this for: This APIELE fused relay pack is aimed at DIY mechanics, automotive electricians, and vehicle modders who need reliable, protected switching for mid-current accessories. It's useful for workshop wiring, RV or marine 12V systems, alarm and actuator installations, and anyone wanting an OEM-like relay socket with integrated fuse protection for safer, cleaner wiring runs.