--- product_id: 64439284 title: "Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat" brand: "gebildet" price: "R509" currency: ZAR in_stock: true category: "Gebildet" url: https://www.desertcart.co.za/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin store_origin: ZA region: South Africa --- # 40A high current capacity Ultra-fast 15ms operate time Built-in diode for voltage protection Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat **Brand:** gebildet **Price:** R509 **Availability:** ✅ In Stock ## Summary > ⚡ Drive Smart, Switch Fast, Stay Protected! ## Quick Answers - **What is this?** Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat by gebildet - **How much does it cost?** R509 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin) ## 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-In Diode Shield:** Protects your precious electronics from damaging voltage spikes—because your ride deserves the best defense. - • **Silver Alloy Contacts:** Premium Ag alloy contacts guarantee ultra-low resistance (≤100mΩ) and long-lasting performance over 100,000 electrical cycles. - • **Compact & Versatile Fit:** Designed for seamless integration in cars, trucks, motorcycles, and boats with standard 12V DC systems—upgrade your gear without hassle. - • **Lightning-Fast Switching:** Operate and release times under 15ms keep your circuits responsive and reliable in every drive. - • **Power Through with 40 Amps:** Handles heavy-duty automotive loads effortlessly, ensuring your vehicle’s electrical system never skips a beat. ## Overview The Gebildet 4pcs JD1912 Car Relay Harness is a high-performance 12V 40A 4-pin SPST relay set featuring built-in diodes for voltage spike suppression, silver alloy contacts for durability, and ultra-fast switching times. Engineered for automotive, truck, motorcycle, and boat applications, it offers reliable operation across extreme temperatures and humidity, ensuring your vehicle’s electrical system runs smoothly and safely. ## Description Interchangeable/Compatible with: All automobiles and devices equipped with a 12 Volt DC power source. Relay technical specification Relay load: 40A/12VDC Contact Resistance: ≤ 100MΩ Contact Material: Ag Alloy Life Expectancy Electrical: 100,000 Operations Life Expectancy Mechanical: 10,000,000 Operations (at 300 Operations/min) Coil power:1.8W Operate Time: ≤ 15ms Release Time: ≤ 10ms Initial withstand voltage of Contact and Contact: 1000VAC/1min Initial withstand voltage of Contact and Coil: 1500VAC/1min Insulation Resistance: 100MΩ/( 500VDC) Temperature Range: -55°C ~+70°C Humidity Range:35%~80% Atmospheric Pressure:86-106KPa ## Features - Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage. - Rated operational voltage: 12V/ Switching Capability:40A - Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA. - Small size/Low power consumption/High contact voltage/ High sensitivity - Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ. Life Expectancy Electrical: 100,000 Operations, Life Expectancy Mechanical: 10,000,000 Operations ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07BK4DBPB | | Best Sellers Rank | 1,331 in Automotive ( See Top 100 in Automotive ) 1 in Car Relays | | Brand | Gebildet | | Coil Resistance | 73.33 Ohms | | Coil Voltage | 1.8 Volts (DC) | | Connector Type | 4 Pin Terminal | | Contact Current Rating | 40 Amps | | Contact Material | Silver Alloy | | Contact Type | Normally Open | | Country Of Origin | China | | Current Rating | 40 Amps | | Customer Reviews | 4.6 4.6 out of 5 stars (462) | | Manufacturer | Gebildet | | Manufacturer Part Number | DE127 | | Minimum Switching Voltage | 8 Volts (DC) | | Model Number | 1 | | Mounting Type | Wall Mount | | Number of Items | 4 | | Number of Packs | 4 | | Operating Time | 0.02 Seconds | | Operation Mode | Electric | | Release Time | 0.01 Seconds | | Specification Met | dc | | UPC | 646040294544 | | Wattage | 1.8 watts | ## Product Details - **Connector type:** 4 Pin Terminal - **Contact material:** Silver Alloy - **Contact type:** Normally Open - **Current rating:** 40 Amps - **Mounting type:** Wall Mount ## Images ![Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat - Image 1](https://m.media-amazon.com/images/I/41YK9y-O48L.jpg) ![Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat - Image 2](https://m.media-amazon.com/images/I/41WbhBlk54L.jpg) ![Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat - Image 3](https://m.media-amazon.com/images/I/41abB0TPcoL.jpg) ![Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat - Image 4](https://m.media-amazon.com/images/I/41S-MLdBvFL.jpg) ![Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat - Image 5](https://m.media-amazon.com/images/I/41o5gxyTFkL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Is this flasher realy on/off at all times once power is supplied to unit?** A: First of all it is not a flasher relay as does not have a timer installed inside it is a standard relay with normally closed or open contacts and when power supplied to it the contacts will operate depending on which tab you have wired to will make or break the supply to the device being powered I use for switching vac pumps on braking systems for locos on a small railway. **Q: Is this a latching relay? Push a button to start, then push a button to stop?** A: noo. you don't have to push any button , it start automatically and stop automatically ,, ( by current ) **Q: Will it be able to switch a 36v main with a 12v signal input?** A: It's rated 12 volts so unlikely. Fine for car spot lights or in my case heated windscreen. **Q: From what I know of relays, the diagram on this listing shows incorrect wiring. Can you confirm please?** A: Hello, the diagram on this listing shows is correct, pin85 and pin86 can connect battery and ground in reverse --- ## 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.co.za/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin](https://www.desertcart.co.za/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-10-08*