--- product_id: 226556587 title: "4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire" brand: "irhapsody" price: "¥3284" currency: JPY in_stock: true category: "I Rhapsody" url: https://www.desertcart.jp/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-heavy store_origin: JP region: Japan --- # 40A max switching current Waterproof & dustproof design 7ms operate & 5ms release time 4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire **Brand:** irhapsody **Price:** ¥3284 **Availability:** ✅ In Stock ## Summary > ⚡ Stay switched on with the relay that never quits! ## 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?** ¥3284 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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 - • **Rapid Response Relay:** Operates in just 7 milliseconds for instant switching - • **Powerhouse Performance:** Handles up to 40 amps for heavy-duty automotive demands - • **Plug & Play Convenience:** Comes with 7-inch heavy-gauge tinned copper wires for easy installation - • **Weather-Resistant Build:** Water-repellent and dustproof to keep your circuits safe - • **Durability You Can Trust:** Rated for 100,000 electrical cycles and 10 million mechanical operations ## Overview The iRhapsody 4-pin 12V DC automotive relay delivers robust 40A switching capacity with a waterproof and dustproof design. Engineered for rapid 7ms operation and built to last over 100,000 electrical cycles, it features heavy-duty 12 AWG tinned copper wiring for reliable connections. Ideal for professionals demanding durable, high-performance relay solutions in harsh environments. ## 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 ## 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 | #3,511 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Replacement Accessory Power Relays | | Brand Name | iRhapsody | | Coil Resistance | 80 ohm | | Coil Voltage | 12 volts | | Connector Type | Plug-In | | Contact Current Rating | 30 A | | Contact Material | Copper | | Contact Type | Normally Open | | Current Rating | 40 A | | Customer Reviews | 4.7 4.7 out of 5 stars (1,007) | | Manufacturer | IRHAPSODY | | Maximum Switching Current | 40 A | | Minimum Switching Voltage | 6 volts | | Model | Relay-MFV | | Mounting Type | Socket Mount | | Number of Items | 1 | | Number of Packs | 1 | | 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 A - **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/41+cD1At0GL.jpg) ![4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire - Image 2](https://m.media-amazon.com/images/I/41n7Eu5fuqL.jpg) ![4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire - Image 3](https://m.media-amazon.com/images/I/41hjCcmyShL.jpg) ![4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire - Image 4](https://m.media-amazon.com/images/I/41dYGJO7rFL.jpg) ![4-pin 40/30Amp 12V DC Waterproof Automotive Relay with Heavy-Duty Wire - Image 5](https://m.media-amazon.com/images/I/41uIsxOAWGL.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. ## 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.jp/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-heavy](https://www.desertcart.jp/products/226556587-4-pin-40-30amp-12v-dc-waterproof-automotive-relay-heavy) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-12*