---
product_id: 226556587
title: "4-pin 40/30AMP 12V DC Waterproof Relay with Heavy-Duty Wires, SPST Automotive Relay, Pack of 1"
brand: "irhapsody"
price: "€ 19.77"
currency: EUR
in_stock: true
reviews_count: 8
category: "I Rhapsody"
url: https://www.desertcart.fr/products/226556587-4-pin-40-30amp-12v-dc-waterproof-relay-with-heavy
store_origin: FR
region: France
---

# 40A max switching current Water-repellent & dustproof design Thick 12-gauge heavy-duty wires 4-pin 40/30AMP 12V DC Waterproof Relay with Heavy-Duty Wires, SPST Automotive Relay, Pack of 1

**Brand:** irhapsody
**Price:** € 19.77
**Availability:** ✅ In Stock

## Summary

> ⚡ Unleash unstoppable power with every click!

## Quick Answers

- **What is this?** 4-pin 40/30AMP 12V DC Waterproof Relay with Heavy-Duty Wires, SPST Automotive Relay, Pack of 1 by irhapsody
- **How much does it cost?** € 19.77 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/226556587-4-pin-40-30amp-12v-dc-waterproof-relay-with-heavy)

## Best For

- irhapsody enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Engineered for 100,000 electrical cycles and extreme temperature resilience
- • **Rapid Response:** Operates in just 7ms with a 5ms release time for instant activation
- • **Weather Warrior:** Waterproof and dustproof casing keeps your relay safe in tough environments
- • **Powerhouse Performance:** Handles up to 40 amps for reliable heavy-duty automotive use
- • **Effortless Installation:** Comes with thick 12-gauge wires and clear wiring diagram for quick setup

## Overview

The iRhapsody 4-pin 12V DC waterproof relay delivers a robust 40A switching capacity with heavy-duty 12-gauge wires, designed for automotive applications requiring fast, reliable, and weather-resistant performance. Its durable construction supports up to 100,000 electrical operations and withstands harsh conditions, making it the go-to choice for professionals who demand longevity and efficiency in their vehicle’s electrical systems.

## Description

Nominal Coil Voltage: 12 V DC Coil Power: 1.8 W Coil Resistance: 80Ω¸ Must Operate Voltage: 6~8 V DC Must Release Voltage: 0.6~3.6 V DC Maximum Applied Voltage: 15.6 V DCContact Ratings: NO 40A 14V DC Contact Resistance: 100mMAX (at6VDC 1A) Max Switching Current: 40A Max Switching Power: 560 W Life Expectancy Electrical: 100,000 Operations (at30 Operations/minute) Life Expectancy Machanical: 10,000,000 Operations Temperature Range: -30 ~ +80 degrees Celsius Vibration Resistance: 10~55Hz, 1.5mm Shock Resistance: Operations Extremes: 10g. Damage Limits: 100g Hunidity: 40% ~ 85% Insulation Resistance: 100mΩ¸ Min at500VDC Dielectric Strength Between Open Contacts: 500VAC (for one minute/sec) Between Contactw and coil: 750AC (for one minute/sec) Operate Tice: 7ms Release Tice: 5ms Package Content: 1 x 12VDC 4 PIN waterproof relay kit

Review: Waterproofed great - Thats good good socket, is waterproofed and long lasting. The wire size is awg16, good shielded. Connect to positive for s big click. Works amazing
Review: Turned My Pickups Horn into the Sound of God’s Wrath - Bought this relay to wire my air horn to my regular horn. Now, every gentle “beep” has been replaced with THE APOCALYPSE IS HERE. Installation? Stupid easy—clear instructions, beefy 12-gauge leads, and built like it could survive a nuclear blast. Waterproof too, so it works perfectly while I’m driving through a storm and scaring the soul out of unsuspecting pedestrians. Yeah, it’s a little bigger than I thought—but that’s fine. It’s the beating heart of my chaos machine. Highly recommend… unless you’re the guy whose coffee they just launched across three lanes of traffic. Great value!

## Features

- Never go beyond its capabilities. Try to stay 10 to 15% below what the rate is for
- 12-volt 4-prong relay. Excellent water-repellent and dustproof ability, but not using it in water
- For the people whose relays are burning, please make sure you are making tight connections (especially on the load wires), read the specs on the item description, and ensure that the operating environment meets the safety requirements of the relay
- Be careful when inserting the relay into the socket. If you force it, you will bend the female connectors
- Thick 12 gauge wire for the load terminals. Easy to install, make sure you follow the wiring diagram. Works for both positive and negative activation

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08D8TSMFV |
| Best Sellers Rank | #4,672 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Replacement Accessory Power Relays |
| Brand | iRhapsody |
| Brand Name | iRhapsody |
| Coil Resistance | 80 Ohms |
| Coil Voltage | 12 Volts |
| Connector Type | Wired |
| Contact Current Rating | 30 Amps |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Current Rating | 40 Amps |
| Customer Reviews | 4.7 out of 5 stars 1,290 Reviews |
| Manufacturer | IRHAPSODY |
| Maximum Switching Current | 40 Amps |
| Minimum Switching Voltage | 6 Volts |
| Mounting Type | Socket Mount |
| Operating Time | 0.01 Seconds |
| Operation Mode | Automatic |
| Warranty Description | 1 year |
| Wattage | 1.8 watts |

## Product Details

- **Connector Type:** Wired
- **Contact Material:** Copper
- **Contact Type:** Normally Open
- **Current Rating:** 40 Amps
- **Mounting Type:** Socket Mount

## Images

![4-pin 40/30AMP 12V DC Waterproof Relay with Heavy-Duty Wires, SPST Automotive Relay, Pack of 1 - Image 1](https://m.media-amazon.com/images/I/61Rqrap1mnL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Are these made in the USA?**
A: I never checked. But, I doubt it.

**Q: In a car, is the dc ground the same as the dc negative?**
A: DC ground and DC negative, chassis ground,  are the same thing, a direct connection to the battery negative terminal. The metal body of the car, frame, sheet metal, engine block etc are all connected together and connected to the negative battery cable .

**Q: Need this in a 24v coil version with a flyback diode or resistor preinstalled.  link?**
A: Hi, This product is for your reference: https://www.amazon.com/dp/B07L2H67BN?ref=myi_title_dp

**Q: Are these suitable for continuous duty?**
A: I use mine for auto radiator fan control, the fan runs continuously in traffic during the summer. No issues.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Waterproofed great
*by U***E on December 11, 2025*

Thats good good socket, is waterproofed and long lasting. The wire size is awg16, good shielded. Connect to positive for s big click. Works amazing

### ⭐⭐⭐⭐⭐ Turned My Pickups Horn into the Sound of God’s Wrath
*by P***O on August 12, 2025*

Bought this relay to wire my air horn to my regular horn. Now, every gentle “beep” has been replaced with THE APOCALYPSE IS HERE. Installation? Stupid easy—clear instructions, beefy 12-gauge leads, and built like it could survive a nuclear blast. Waterproof too, so it works perfectly while I’m driving through a storm and scaring the soul out of unsuspecting pedestrians. Yeah, it’s a little bigger than I thought—but that’s fine. It’s the beating heart of my chaos machine. Highly recommend… unless you’re the guy whose coffee they just launched across three lanes of traffic. Great value!

### ⭐⭐⭐⭐⭐ FIRST IMPRESSION OUT OF THE PACKAGE
*by J***H on June 22, 2023*

Not stated for the purpose of impressing anyone but I am an electronics expert over a career of 45 years retired. I can assess the quality of an electronic device in short order. That said, I needed this type of relay to solve a problem pertaining to a hard starting compact tractor which is a common problem for many brands which is caused by a voltage drop at the starter solenoid trigger wire due to the age of the wiring. This happens because over a long time copper wires can and will oxidize internally under the insulation due to the impurity of the copper alloys used and also in many cases by the type of insulation which in some cases can also contribute to that oxidation by chemical reaction. When over time the oxidation reaches a certain level resistance builds in the wires circuits . An input voltage of say 12 volts can drop as much as 2 volts or more when it is sent through the oxidized wire and that voltage is made to travel across in series controls like safety switches ect . before the voltage finally reaches the actual accessories /loads. That is what is happening in my own case with a 36 year old tractor .For me it makes no sense to replace the harness because of just one (1) wire , it is too costly and too labor intensive, whereas this relay will restore that voltage to the starter solenoid by allowing a new wire connected to the battery directly and fused according to the load to be controlled by the same starting switch that presently starts the tractor. Obviously this relay can be used to switch various accessories on and off besides providing a full 12 volt to a starter solenoid that is only getting 11 or less volts because of electrical resistance build up over 36 years. I bought the five pack to have extra relays on hand in case the relay should fail sooner than expected , when that occurs I will have 4 more relays on hand to snap into the socket the sockets of the relay is permanent and needs never be changed unless it is damaged somehow. I inspected this relay and the photo shows the socket to have quality brass female receivers , the insulation of the wires appears to be high quality automotive GTP, or PVC , the copper wire leads are adequately long and the silicon weather proofing gaskets appear to be high quality as does the black thermoplastic used for the housings , there is no reason to suspect that this manufacturer would use an inferior relay to accompany all that quality . Unpressurized water such as rain or moisture or even a gentle shower hose rinse is unlikely able to permeate the socket or the relay seal , when installed vertically by the metal tab, mounted upside down may make it possible but still difficult unless the water being aimed at the base is substantially pressurized. One gent`s comment that I read is about just that , relays in theory can operate in any orientation , however they do last longer when they are orientated vertically , with the relay up wires down . The electromagnet switch hinges inside these relays are such that their life cycles depend on the best orientation as described ...vertically mounted by the metallic tab , if positioned otherwise those hinges will wear out sooner and unevenly causing hang ups that will not make the switch contacts touch . In turn diagnosing the issue will lead to suspect water infiltration versus mechanical failure. I have no vested interest in this product nor am I sponsored by the seller. For now this is a first impression review based upon the perceived quality of the product which seems to me to be high and fairly priced. I will write an assessment of reliability after a year of use or whatever time the relay last before failure when installed in the best orientation .

## Frequently Bought Together

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-27*