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โก Power up your ride with smart, safe switching!
The MGI SpeedWare Fused Relay 40A 12vDC 4-Pin SPST (2-Pack) is a high-performance automotive relay kit featuring 40A switching capacity, built-in 30A LED blade fuses for instant blown fuse alerts, and heat-resistant GXL leads rated up to 125ยฐC. Designed for easy installation with pre-wired harness sockets and mounting tabs, this kit supports resistive and motor loads, making it ideal for reliable, high-power circuit control in demanding automotive environments.








| ASIN | B07BTL7XG3 |
| Best Sellers Rank | #382,448 in Automotive ( See Top 100 in Automotive ) #783 in Automotive Replacement Accessory Power Relays |
| Brand | MGI SpeedWare |
| Brand Name | MGI SpeedWare |
| Coil Voltage | 12 volts |
| Connector Type | Plug-In |
| Contact Current Rating | 40 A |
| Contact Material | Brass |
| Contact Type | Normally Open |
| Current Rating | 40 A |
| Customer Reviews | 4.4 out of 5 stars 121 Reviews |
| Included Components | Relay, fuse, and socket |
| Manufacturer | MGI |
| Maximum Switching Current | 40 A |
| Minimum Switching Voltage | 12 volts_of_direct_current |
| Model | EP-FREL4/40 |
| Mounting Type | Socket Mount |
| Operation Mode | Electric,Motor |
| Part Number | EP-FREL4/40 |
| Upper Temperature Rating | 125 ยฐC |
A**.
Works.
Used 2 of these to wire my high and low sleed cooling fans to a switch in my xterra. They work like they are supposed to. I like that they are fused, I kept burning out relays because I was pulling too much power.
D**E
Exactly as described. Very courteous. Highly recommended seller.
Exactly as described. Very courteous. Highly recommended seller.
G**E
Works great
Use for my fog lights the only thing Iโm not a fan of is the fuse built on top but hasnโt gave me any problems
W**S
Simplify your wiring
The built in fuse helps clean up your wiring projects.
C**S
Great product
Worked great for my application. Would recommend this product to all.
H**D
color coded and plenty of wire was GREAT and shipped with assortment of fusses
made my wiring job so much easier.
C**L
Not so hot
Nice relays except one of the two doesnโt work. Will not put out any power. The other one works if you jiggle it.
J**R
Good value for the price
Worked as expected, water resistant??( I hope I never have to test that resistance)! โ easy to installโ Depends on ones use of the relays , so ??
C**S
Very pleased
I used two of these for horn relay circuits in my car (two independent horns). The relays snap together for easier mounting in banks of two or more, work well in limited spaces, and function perfectly. Construction quality seems very good.
J**N
nice relay with light up fuse
i got this relay for my racing fuel pump. rewired all the wiring because the pump draw extra amp. this relay works pretty good. especially with the light up fuse. it tells me right away when the fuse is blow. i don't need to use my multi meter to check. and my pump use 20 amps. the wire on it takes it no problem.
K**S
30amp not 40
I like the relays but I didnt like the fact it claims to be 40amp fused when they are actually 30amp fused. They do make for less wiring by having the fuse on top. However if you have to switch to a resistor or diode type you will be forced to fuse the power wires anyways.
D**N
Works as advertised.
These are able to be linked together to form a row of relays, nice little feature if you're looking to hide them in a glovebox. The built in fuse socket also cuts down massively on wiring. Would recommend.
R**E
Light duty. Maybe a horn?
Not suitable for high amperage or continuous use. Will overheat.
Trustpilot
5 days ago
2 days ago