--- product_id: 123043634 title: "80-Amp Relay 12V Continuous Duty Solenoid Relay Battery Isolator and Relay | High Current Starter Relay Sliver Pins,Protect Starting Charge While Running Car Audio, Automatic Switching For Truck,Boat,Rv" brand: "mayspare" price: "S$44" currency: SGD in_stock: true reviews_count: 13 category: "May Spare" url: https://www.desertcart.sg/products/123043634-80-amp-relay-12v-continuous-duty-solenoid-relay-battery-isolator store_origin: SG region: Singapore --- # 80A continuous current 100,000 mechanical cycles durability 12V DC voltage compatibility 80-Amp Relay 12V Continuous Duty Solenoid Relay Battery Isolator and Relay | High Current Starter Relay Sliver Pins,Protect Starting Charge While Running Car Audio, Automatic Switching For Truck,Boat,Rv **Brand:** mayspare **Price:** S$44 **Availability:** ✅ In Stock ## Summary > 🔋 Power your adventures with unstoppable reliability! ## Quick Answers - **What is this?** 80-Amp Relay 12V Continuous Duty Solenoid Relay Battery Isolator and Relay | High Current Starter Relay Sliver Pins,Protect Starting Charge While Running Car Audio, Automatic Switching For Truck,Boat,Rv by mayspare - **How much does it cost?** S$44 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/123043634-80-amp-relay-12v-continuous-duty-solenoid-relay-battery-isolator) ## Best For - mayspare enthusiasts ## Why This Product - Trusted mayspare brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Engineered for 100,000 mechanical cycles ensuring long-term reliability in demanding environments. - • **Plug & Play Installation:** Includes heavy-duty terminals and insulated caps for quick, secure mounting and hassle-free setup. - • **Premium Contact Materials:** Copper contacts with silver pins deliver superior conductivity and corrosion resistance. - • **Seamless Battery Isolation:** Automatically manages dual battery systems to protect your starter charge and extend battery life. - • **Power Through with Confidence:** Handles a robust 80A continuous current and surges up to 150A for peak performance. ## Overview The MaySpare 80-Amp 12V Continuous Duty Solenoid Relay is a high-performance battery isolator designed for dual battery systems in trucks, boats, and RVs. Featuring 80A continuous current capacity, surge handling up to 150A, and durable copper-silver contacts, it ensures efficient power management and starter protection. With a 100,000 cycle mechanical lifespan and included heavy-duty terminals, this relay offers professional-grade reliability and easy installation for millennial managers who demand both performance and peace of mind. ## Description 80-Amp Relay 12V Continuous Duty Solenoid Relay Battery Isolator and Relay | High Current Starter Relay Sliver Pins,Protect Starting Charge While Running Car Audio, Automatic Switching For Truck,Boat,Rv: desertcart.com: Industrial & Scientific Review: good value for the money - works as described Review: Works great - Works great ## Features - Double Batteries Isolator Control On/Off Switch; Continuous Amps: 80,Surge Max Amps:150A ,Voltage: 12VDC; 100,000 mechanical cycle life./Normally Open With Attaching Hardware, Copper Contact With Sliver Pins - Max Switching Currecnt could pass 150A at 5ms ,and Max Switching power could be 2000W / Replace: White Rodgers: 120-105751, 120-105751-6, 120-901S1,120-107112/ Cummins 3916301 3916302 - Note: It requires constant voltage as but depending on the application. The working time could be around continuous four or five hours , stop it and then use it. - Install:The kit has included 4pcs big 100AMP terminals connected to loading and 4pcs small terminals which connected to original power. 4pcs insulated skin red cap. - high current relays are the most reliable and efficient way to add secondary batteries to your system; Provide better service, please contact us if you have any questions! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07MV4WJ7K | | Best Sellers Rank | #30,795 in Automotive ( See Top 100 in Automotive ) #7 in Automotive Replacement Starter Solenoids | | Brand | MaySpare | | Brand Name | MaySpare | | Coil Resistance | 18 ohm | | Coil Voltage | 12 volts | | Connector Type | Screw | | Contact Current Rating | 80 A | | Contact Material | Copper Silver | | Contact Type | Normally Open | | Current Rating | 80 A | | Customer Reviews | 4.5 out of 5 stars 472 Reviews | | Manufacturer | May Spare Parts | | Maximum Switching Current | 1 A | | Minimum Switching Voltage | 13 volts_of_direct_current | | Model | US-4t500A | | Mounting Type | Screw Mount | | Operation Mode | Continuous Duty | | Part Interchange Info | SGP38,6C017,120-901,120-105751,120-105751-6,120-901S1 | | Part Number | US-4t500A | | Specification Met | OEM | | UPC | 754111153130 | | Upper Temperature Rating | 80 °C | | Wattage | 2000 watts | ## Product Details - **Connector Type:** Screw - **Contact Material:** Copper Silver - **Contact Type:** Normally Open - **Current Rating:** 80 A - **Mounting Type:** Screw Mount ## Images ![80-Amp Relay 12V Continuous Duty Solenoid Relay Battery Isolator and Relay | High Current Starter Relay Sliver Pins,Protect Starting Charge While Running Car Audio, Automatic Switching For Truck,Boat,Rv - Image 1](https://m.media-amazon.com/images/I/61s9d9XXu2L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What do I need to be able to use as a switch between batteries and a 2000 watt inverter?** A: If all you want to do is disconnect/connect the batteries from the inverter remotely, you need a 12v switched source to the coil and a ground. It is just a single pole single throw switch. **Q: If contacts are copper, this does not meet requirements for 120-901. What is the actual contact material? What does silver pins mean?** A: Bought 2 and both coils failed **Q: The note "The working time could be around continuous four or five hours , stop it and then use it." What if I have a 8 hour road trip?** A: I took a road trip 24hrs one way drove 18 hrs the first day 6 hrs the second day then turn around 4 days later repeated in the middle of summer with no problem the relay i replaced was the same make and model butI probably not the original in my 1995 Chevy conversion van relay is for charging my back battery also left it running for 8hrs plus in 90- 100 degrees so my pets saying cool inside hope this helps **Q: Can us you be used for a plow** A: I believe this should work for a plow setup. Just double check the amp draw from the plow’s specs. ## Customer Reviews ### ⭐⭐⭐⭐⭐ good value for the money *by A***R on February 23, 2026* works as described ### ⭐⭐⭐⭐⭐ Works great *by D***N on November 19, 2025* Works great ### ⭐⭐⭐⭐⭐ Good product *by B***R on July 19, 2025* Came quickly and same dimensions as OEM. --- ## 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.sg/products/123043634-80-amp-relay-12v-continuous-duty-solenoid-relay-battery-isolator](https://www.desertcart.sg/products/123043634-80-amp-relay-12v-continuous-duty-solenoid-relay-battery-isolator) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-08-18*