---
product_id: 204814170
title: "EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style"
brand: "epauto"
price: "₪191"
currency: ILS
in_stock: true
reviews_count: 5
category: "Epauto"
url: https://www.desertcart.co.il/products/204814170-epauto-5-pack-30-40-amp-relay-harness-spdt-12v
store_origin: IL
region: Israel
---

# 40A max switching current UL flame retardant wires 10ms ultra-fast operate time EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style

**Brand:** epauto
**Price:** ₪191
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your ride’s brain with EPAuto’s relay harness – power, speed, and safety in one pack!

## Quick Answers

- **What is this?** EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style by epauto
- **How much does it cost?** ₪191 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.il](https://www.desertcart.co.il/products/204814170-epauto-5-pack-30-40-amp-relay-harness-spdt-12v)

## Best For

- epauto enthusiasts

## Why This Product

- Trusted epauto brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First:** Equipped with UL flame retardant 9" wires for maximum protection
- • **Built to Last:** Endures 10 million mechanical operations with rock-solid reliability
- • **Precision Switching:** Ultra-fast 10ms operate and 5ms release times for instant response
- • **Powerhouse Performance:** Handles up to 40 amps for heavy-duty automotive demands
- • **Plug & Play Convenience:** Comes with 5 relays and molded sockets with 5-wire harness for easy installation

## Overview

The EPAuto 5 Pack 30/40 AMP Relay Harness features high-capacity 40A switching, UL flame retardant wiring, and ultra-fast 10ms operate time. Designed for automotive use, it offers durable socket mounts, silver contacts, and withstands extreme temperatures (-40°C to 125°C). This kit includes 5 relays and sockets with 5-wire harnesses, ensuring reliable, safe, and easy installation for professional-grade electrical switching.

## Description

Contact Capacity: Normal switching Capacity (res.load): - NO 40A 14VDC - NC 30A 14VDC Max. switching current: 40A Max. switching voltage: 30VDC Max. switching power: 560W Characteristic Data: Initial contact resistance (at 6VDC 1A): 50mΩ Max. Operate time (at nominal volt.): 10 msec. Max. Release time (at nominal volt.): 5 msec Max. Initial insulation resistance: 100MΩ Min. (DC500V) Initial dielectric strength: - Between open contacts: AC500V, 50/60 Hz 1Min. - Between coil and contact: AC500V, 50/60 Hz 1Min. Vibration resistance: - Functional: 10 ~ 55Hz at double amplitude of 1.5 mm - Destructive: 10 ~ 55Hz at double amplitude of 1.5 mm Shock resistance: - Functional: 20G Min. - Destructive: 100G Min. Endurance (operations): - Mechanical (at 7,200 ops./h): 10,000,000 - Electrical (at 600 ops./h): 100,000 Ambient Temperature: -40°C ~ +125°C (no condensation)

Review: Work great for a variety of automotive things.
Review: Never know when you'll need a couple of these....

## Features

- 40A/30A high switching capability.
- Heavy-duty impact molded relay socket with 5 WIRES。White (common), Black (normally closed), and Yellow (normally open).
- Package Include: 5 relays + 5 relay sockets with wires.
- Safety UL Flame retardant 9" wires for the main contact.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B017VDI0GY |
| Best Sellers Rank | 564,814 in Automotive ( See Top 100 in Automotive ) 2,223 in Car Relays |
| Brand | EPAUTO |
| Coil Voltage | 12 Volts |
| Connector Type | Plug-In |
| Connector type | Plug-In |
| Contact Current Rating | 40 Amps |
| Contact Material | Silver |
| Contact Type | Normally Closed |
| Contact material | Silver |
| Contact type | Normally Closed |
| Current Rating | 40 Amps |
| Current rating | 40 Amps |
| Customer Reviews | 4.7 out of 5 stars 6,576 Reviews |
| Item height | 3.61 inches |
| Manufacturer | EPAuto |
| Maximum Switching Current | 30 Amps |
| Minimum Switching Voltage | 12 Volts (DC) |
| Mounting Type | Socket Mount |
| Mounting type | Socket Mount |
| Operating Time | 0.01 Seconds |
| Operation Mode | Automatic |
| Specification Met | epauto |
| UPC | 690443852320 |
| Upper Temperature Rating | 125 Degrees Celsius |
| Wattage | 560 watts |

## Product Details

- **Connector type:** Plug-In
- **Contact material:** Silver
- **Contact type:** Normally Closed
- **Current rating:** 40 Amps
- **Mounting type:** Socket Mount

## Images

![EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style - Image 1](https://m.media-amazon.com/images/I/41gvdEr3unL.jpg)
![EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style - Image 2](https://m.media-amazon.com/images/I/711F-R2t1CL.jpg)
![EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style - Image 3](https://m.media-amazon.com/images/I/717+AKVZzHL.jpg)
![EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style - Image 4](https://m.media-amazon.com/images/I/71A038LGcgL.jpg)
![EPAuto 5 Pack - 30/40 AMP Relay Harness Spdt 12V Bosch Style - Image 5](https://m.media-amazon.com/images/I/71ml-xREnRL.jpg)

## Questions & Answers

**Q: Where does the red wire connects to?**
A: The red wire connects to pin 87a which remains in contact with the common (pin 30, blue) when the relay isn't energized.  this is known as the "Normally closed" (NC) circuit.  Don't use it unless you want the relay to power something off when the relay activates; i.e., for most operations you leave it disconnected.

**Q: What gauge are the leads that come off the relay?**
A: The wire on these harnesses are 16AWG and are too small for powering vehicles electric fan on radiator which pulls 15-30A per fan.
Use a 30A fuse right after the battery going to the 85/86 on relay, make sure the 30 & 87 on relay have 10ga OFC primary wire.
You need 10AWG guage for 7-16ft applications, it has to be OFC/Tinned Copper, make sure it's not CCA. GS Power brand on Amazon has OFC called 100% pure copper.
Pick up yellow(12-10 guage) heatshrink butt connectors(to connect the wires properly), yellow heatshrink female spade connectors(for relay post prongs) and some yellow heatshrink ring connectors in multipack of different ring diameters(for grounding the wire to Frame bolts)
Then get heatshrink tubing 1/4" should be fine if it's 3:1 or 4:1 Wirefy is a good brand. I get the spools instead of the precut packs.
Heatshrink connectors and durable heatshrink tubing is extreamly important for automotive purpose, the weather in vehicles can corrode it and cause melting or worse.

**Q: Will these work to shut off compressors for air ride suspension on a truck**
A: As long as the total amperage draw of the compressor and any other power consuming components of the air suspension system are less then the 40 amp relay, these should work fine.

**Q: Im more of an ac instead of dc guy but u can run 24v through ur no terminal just has to have 12v to bring in the coil on the relay correct?**
A: You can apply 12VDC to the coil (usually, that means 10 -15VDC) to close the contacts of the Normally Open terminals.  When the Normally Open terminals are closed, the Normally Closed terminals are open.Once the terminals are closed, they can handle 30 amps DC.There isn't a specification for the voltage that the N/O and N/C terminals can handle... but I'm certain that they can handle 24 volts.Just don't put more than 14.4VDC across the coil.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Work great for a variety of automotive things.
*by J***S on 5 July 2019*



### ⭐⭐⭐⭐⭐ Never know when you'll need a couple of these....
*by P***D on 18 February 2025*



### ⭐⭐⭐⭐⭐ Nice to have around for non-critical applications
*by Z***L on 13 May 2024*



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**Shop now:** [https://www.desertcart.co.il/products/204814170-epauto-5-pack-30-40-amp-relay-harness-spdt-12v](https://www.desertcart.co.il/products/204814170-epauto-5-pack-30-40-amp-relay-harness-spdt-12v)

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*Product available on Desertcart Israel*
*Store origin: IL*
*Last updated: 2026-01-23*