--- product_id: 226556587 title: "4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire" brand: "irhapsody" price: "$23.71" currency: USD in_stock: true reviews_count: 8 category: "I Rhapsody" url: https://www.desertcart.us/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-heavy store_origin: US region: United States of America --- # 40A max switching current Water-repellent & dustproof design 7ms operate / 5ms release time 4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire **Brand:** irhapsody **Price:** $23.71 **Availability:** ✅ In Stock ## Summary > ⚡ Drive your automotive projects with power and precision! ## Quick Answers - **What is this?** 4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire by irhapsody - **How much does it cost?** $23.71 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-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 - • **Robust Wiring:** Equipped with 12 AWG tinned copper primary leads for superior conductivity and durability - • **Precision Switching:** Ultra-fast 7ms operate and 5ms release times for seamless electrical control - • **Powerhouse Performance:** Handles up to 40 amps for heavy-duty automotive demands - • **Weather-Resistant Build:** Water-repellent and dustproof to keep your circuits safe in tough environments - • **Long-Lasting Reliability:** Engineered for 100,000 electrical operations and built to withstand shocks and vibrations ## Overview The iRhapsody 4-pin 12V DC waterproof relay delivers a robust 40A switching capacity with fast 7ms operation and durable 12 AWG tinned copper wiring. Designed for automotive use, it features water-repellent and dustproof protection, ensuring reliable performance in harsh conditions. Rated for 100,000 electrical cycles and built to resist shocks and vibrations, this relay is your go-to for heavy-duty, long-lasting electrical switching. ## 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: It works - Its a relay and works fine Review: Works for powered window conversions - I’m using this for a power window conversion. It works well. Instructions are easy to follow — you can find more detailed help online (the colors / terminals are common across all of these) No audible click as far as I can tell ## Features - Excellent water-repellent and dustproof ability, but do not use it in water - Never exceed its capabilities. Try to stay 10 to 15% below the rated value - Pay attention to the dimensions (1.4 x 1.4 x 10 inches)! For some applications, it might be too big - 12-volt 4-prong relay. Primary leads use 12 AWG tinned copper wire. Coil leads use 16 AWG. The length of the wire is 7 inches - For people whose relays are burning, please make sure you are making tight connections (especially on the load wires), read the specs in the item description, and ensure the operating environment meets the relay's safety requirements ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08D8TSMFV | | Best Sellers Rank | #2,580 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Accessory Power Relays | | Brand | iRhapsody | | Brand Name | iRhapsody | | Coil Resistance | 80 Ohms | | Coil Voltage | 12 Volts | | Connector Type | Plug-In | | Contact Current Rating | 30 Amps | | Contact Material | Copper | | Contact Type | Normally Open | | Current Rating | 40 Amps | | Customer Reviews | 4.7 out of 5 stars 962 Reviews | | Manufacturer | IRHAPSODY | | Maximum Switching Current | 40 Amps | | Minimum Switching Voltage | 6 Volts | | Model | Relay-MFV | | Mounting Type | Socket Mount | | Operating Time | 0.01 Seconds | | Operation Mode | Automatic | | Part Number | 4PIN12VRelay40AWF1P | | Warranty Description | 1 year | | Wattage | 1.8 watts | ## Product Details - **Connector Type:** Plug-In - **Contact Material:** Copper - **Contact Type:** Normally Open - **Current Rating:** 40 Amps - **Mounting Type:** Socket Mount ## Images ![4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire - 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 ### ⭐⭐⭐⭐⭐ It works *by J***N on February 2, 2026* Its a relay and works fine ### ⭐⭐⭐⭐⭐ Works for powered window conversions *by E***E on January 21, 2026* I’m using this for a power window conversion. It works well. Instructions are easy to follow — you can find more detailed help online (the colors / terminals are common across all of these) No audible click as far as I can tell ### ⭐⭐⭐⭐⭐ Rugged relay. Well made *by A***R on April 4, 2026* Heavy duty solid built relay. ## Frequently Bought Together - irhapsody 4-PIN 40/30AMP 12V DC Waterproof Relay with Harness - Heavy Duty 12 AWG Tinned Copper Wires, 1 Pack SPST Automotive Relay - MCIGICM 12 AWG Inline Fuse Holder with 30A ATC/ATO Blade Fuse, 5 Pack - Askcable 12Gauge 50FT Electrical Wire Cable Flexible Wire Extension Cord 12AWG Copper Clad Aluminum Copper Wire 2 Conductors Red Black Parallel Wire line Hookup LED Lighting Strips 12V/24V DC Cable --- ## 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.us/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-heavy](https://www.desertcart.us/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-heavy) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-06*