---
product_id: 664097440
title: "2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires"
brand: "gebildet"
price: "8.98 OMR"
currency: OMR
in_stock: true
reviews_count: 8
category: "Gebildet"
url: https://www.desertcart.com.om/products/664097440-2pcs-40-30-amp-waterproof-relay-switch-12awg-harness-set
store_origin: OM
region: Oman
---

# 40A max contact current Waterproof design Built-in diode protection 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires

**Brand:** gebildet
**Price:** 8.98 OMR
**Availability:** ✅ In Stock

## Summary

> ⚡ Drive with confidence—rely on Gebildet’s rugged, waterproof relay power!

## Quick Answers

- **What is this?** 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires by gebildet
- **How much does it cost?** 8.98 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/664097440-2pcs-40-30-amp-waterproof-relay-switch-12awg-harness-set)

## Best For

- gebildet enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Endures up to 10 million mechanical operations for unmatched reliability
- • **Smart Safety Shield:** Integrated diode suppresses voltage spikes, protecting your vehicle’s electronics
- • **Weatherproof Warrior:** Engineered to withstand rain, splash, and harsh environments
- • **Plug & Play Precision:** Color-coded 12AWG wiring for hassle-free, foolproof installation
- • **Powerhouse Performance:** Handles up to 40 Amps for heavy-duty automotive demands

## Overview

The Gebildet 2pcs 40/30 Amp Waterproof Relay Switch Set features 12V DC 4-pin SPST automotive relays with a robust 40A max contact current rating. Designed for harsh conditions, it offers excellent waterproof performance and includes built-in diodes to protect against voltage spikes. The set comes with color-coded 12AWG wiring for easy installation and a metal mounting tab for secure fitting. Rated for extreme temperatures (-40 to +125°C) and millions of operations, this relay harness is a durable, professional-grade solution for automotive and marine electrical systems.

## Description

Specifications: Coil Voltage: 12V DC Coil Current: 160 mA Switching Voltage: 14V DC Max Contact Current Rating: - NO 40A 14V DC - NC 30A 14V DC Ambient Temperature: -40 ~ +125 degree C (no condensation) Initial contact resistance (at 6VDC 1A): 50mΩ¸ 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. Endurance (operations): - Mechanical (at 7,200 ops./h): 10,000,000 - Electrical (at 600 ops./h): 100,000 Please Note: --- Easy to mount - No instructions were included - You do need to know a little about electrical. --- For your and others' safety, let professional technicians to install the equipment.

Review: Good relay - The relay is somewhat bulky, but it's a perfect option for an underhood environment or perhaps even a marine environment. I'm using it in the engine compartment of my car. I'm happy with it. Works as expected.
Review: Worth the money - All the wiring feeding the fuses is 10 awg. Relays are fed by 10 gauge wire also. This thing is worth the money. The 5 extra fuse spots are nice feature. These things are not really waterproof they're not sealed they have a top and a bottom so maybe a splash. If I need another of these relay/fuse boxes this will be the one I buy.....edit:I use these on side by sides I've had mine for a few months now I recommend if the panel is on something with vibration at least put a rubber dampner of some kind on the box the relays walk out of their holes. I put a 3/16 thick rubber pads under the mounting holes and replaced the relays with better 5 pin relays. The relays that come in the box are sealed relays but they're 4 pin. The 4 pin is all the the box uses but the more quality 5 pin relays fit tighter in the sockets

## Features

- 12 V DC automotive waterproof relay (max 14 V). Note: 12 V and 14 V are coil voltages, they are not the voltage that triggers the switch.
- Wire Specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86) and Blue - Output N/O (87).
- Excellent waterproof performance, high quality in any weather conditions.
- Easy Wiring - The relay sockets come with color-labeled wires for loads/accessories convenient wiring. Metal mounting tab on the relay for easy installation.
- Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07TWC48QW |
| Best Sellers Rank | #26,382 in Automotive ( See Top 100 in Automotive ) #13 in Automotive Replacement Starter Relays |
| Brand | Gebildet |
| Brand Name | Gebildet |
| Coil Resistance | 75 Ohms |
| Coil Voltage | 12 Volts (DC) |
| Connector Type | Quick Connect |
| Contact Current Rating | 40 Amps |
| Contact Material | Silver |
| Contact Type | Normally Open |
| Current Rating | 40 Amps |
| Customer Reviews | 4.7 out of 5 stars 810 Reviews |
| Global Trade Identification Number | 08431248938183 |
| Item Height | 3.6 centimeters |
| Manufacturer | Gebildet |
| Minimum Switching Voltage | 14 Volts (DC) |
| Mounting Type | Screw Mount |
| Operation Mode | Automatic |
| Specification Met | IEC/EN 60947 |
| Wattage | 1.92 watts |

## Product Details

- **Connector Type:** Quick Connect
- **Contact Material:** Silver
- **Contact Type:** Normally Open
- **Current Rating:** 4E+1 Amps
- **Mounting Type:** Screw Mount

## Images

![2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires - Image 1](https://m.media-amazon.com/images/I/51esTc7zIUL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good relay
*by B***N on April 5, 2025*

The relay is somewhat bulky, but it's a perfect option for an underhood environment or perhaps even a marine environment. I'm using it in the engine compartment of my car. I'm happy with it. Works as expected.

### ⭐⭐⭐⭐⭐ Worth the money
*by B***T on August 14, 2025*

All the wiring feeding the fuses is 10 awg. Relays are fed by 10 gauge wire also. This thing is worth the money. The 5 extra fuse spots are nice feature. These things are not really waterproof they're not sealed they have a top and a bottom so maybe a splash. If I need another of these relay/fuse boxes this will be the one I buy.....edit:I use these on side by sides I've had mine for a few months now I recommend if the panel is on something with vibration at least put a rubber dampner of some kind on the box the relays walk out of their holes. I put a 3/16 thick rubber pads under the mounting holes and replaced the relays with better 5 pin relays. The relays that come in the box are sealed relays but they're 4 pin. The 4 pin is all the the box uses but the more quality 5 pin relays fit tighter in the sockets

### ⭐⭐⭐⭐⭐ Nice metal mounting bracket.
*by P***C on July 16, 2025*

Works well. Bracket installation is optional. Waterproof and heavy wire leads.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.com.om/products/664097440-2pcs-40-30-amp-waterproof-relay-switch-12awg-harness-set](https://www.desertcart.com.om/products/664097440-2pcs-40-30-amp-waterproof-relay-switch-12awg-harness-set)

---

*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-03-05*