--- 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: "18621CFA" currency: XOF in_stock: true reviews_count: 13 category: "Gebildet" url: https://www.desertcart.sn/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin store_origin: SN region: Senegal --- # 40A high current capacity 12V standard automotive voltage Ultra-fast 15ms operate time Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat **Brand:** gebildet **Price:** 18621CFA **Availability:** ✅ In Stock ## Summary > ⚡ Power up your ride with precision and speed! ## 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?** 18621CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/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 - • **Endurance You Can Trust:** Engineered for 100,000 electrical cycles and 10 million mechanical operations—built to outlast your ride. - • **Lightning-Fast Switching:** Operate and release times under 15ms keep your systems responsive and smooth under pressure. - • **Robust 40A Load Handling:** Supports heavy-duty automotive, truck, motorcycle, and marine applications without breaking a sweat. - • **Built-in Diode Protection:** Safeguards your vehicle’s electronics from voltage spikes, ensuring longevity and reliability. - • **Premium Silver Alloy Contacts:** Delivers ultra-low resistance (≤100mΩ) for efficient power transfer and minimal energy loss. ## 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 protection, premium silver alloy contacts for low resistance, and ultra-fast switching times. Designed for automotive, truck, motorcycle, and marine use, it offers exceptional durability with a lifespan of up to 100,000 electrical operations and 10 million mechanical cycles, ensuring reliable and efficient power management in demanding environments. ## 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 | 2,490 in Automotive ( See Top 100 in Automotive ) 4 in Car Relays | | Brand | Gebildet | | Coil Resistance | 73.33 Ohms | | Coil Voltage | 1.8 Volts (DC) | | Connector Type | 4 Pin Terminal | | Connector type | 4 Pin Terminal | | Contact Current Rating | 40 Amps | | Contact Material | Silver Alloy | | Contact Type | Normally Open | | Contact material | Silver Alloy | | Contact type | Normally Open | | Country Of Origin | China | | Current Rating | 40 Amps | | Current rating | 40 Amps | | Customer Reviews | 4.6 out of 5 stars 451 Reviews | | Manufacturer | Gebildet | | Manufacturer Part Number | DE127 | | Minimum Switching Voltage | 8 Volts (DC) | | Model Number | 1 | | Mounting Type | Wall Mount | | Mounting type | Wall Mount | | 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:** Through Hole - **Contact material:** Silver - **Contact type:** Normally Open - **Current rating:** 40 Amps - **Mounting type:** Through Hole 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/519gzFmaj-L.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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by S***W on 7 December 2025* ### ⭐⭐⭐⭐⭐ Review *by R***G on 17 October 2025* ### ⭐⭐⭐⭐⭐ Review *by M***G on 6 April 2025* --- ## 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.sn/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin](https://www.desertcart.sn/products/64439284-gebildet-4pcs-jd1912-car-relay-harness-12v-40a-4-pin) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-07-15*