Automotive Fused Relay 40A SPST

(2 customer reviews)

$12.99 (USD)

Premium 40 amp relay with built-in fuse

This 4-pin SPST fused relay is exclusively manufactured for MGI so to handle 40A loads instead of the typical 30A. Relays control high-current loads that regular switches can’t. The built-in fuse protects your relay and device without added wiring.

Out of stock

SKU: EP-FREL40 Category:


5-Pin Relay 40A with Socket

High Current Control

Rated 40A at 12vDC.

  • Terminals 85 & 86 connect to your switch and ground, while terminals 30 & 87 connect to your power supply and high-current load.
  • Built-in fuse holder with LED blade fuse. MGI recommends sizing your fuse 1.25 x rated current for resistive loads and 2.5 x rated current for motor loads (fans & pumps)

5-Pin Relay 40A with Socket

Easy Installation

The 5 pin socket comes pre-wired for easy installation.

  • Simply crimp terminals onto the wires and connect them to your load.
  • Interlocking sockets lets you add or subtract any number of relays with ease

5-Pin Relay 40A with Socket

High Quality Wire

Pre-wired relay harness with high-temperature color-coded GXL wire.

  • Stranded copper in cross-linked polyethylene
  • High heat tolerance — rated for temperatures up to 257°F (125°C)
  • Thin GXL wall — flexible, shape-retaining, and easy to handle
5-Pin Relay 40A with Socket

How to wire a 4 pin socket harness
pre-wired socket allows for easy installation

Pre-Wired Colors

  • 18 AWG White — 85 relay coil
  • 18 AWG Black — 86 relay coil
  • 14 AWG Red — 87 N.O.
  • 14 AWG Blue — 30 Common
5 pin relay socket wiring diagram

2 reviews for Automotive Fused Relay 40A SPST

  1. Don Knight (verified owner)

  2. David (verified owner)

    One of the relay’s spade connectors was bent a little. I removed it from the housing and straightened it so the relay could engage properly. Otherwise, the assembly works great and great service by MGI!

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Before finalizing your purchase

It is important to familiarize yourself with the MGI panel Installation Manual. Not only does this help you to select the appropriate options for your race panel, it will enable you to tackle any troubleshooting issues with confidence.