--- product_id: 123043634 title: "MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST" brand: "mayspare" price: "S$35" currency: SGD in_stock: true reviews_count: 13 category: "May Spare" url: https://www.desertcart.sg/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter store_origin: SG region: Singapore --- # 80A continuous current 500A surge max amps 100,000 mechanical cycles MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST **Brand:** mayspare **Price:** S$35 **Availability:** βœ… In Stock ## Summary > ⚑ Power your dual-battery system with unstoppable reliability! ## Quick Answers - **What is this?** MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST by mayspare - **How much does it cost?** S$35 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-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter) ## 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 - β€’ **Built to Last:** Engineered for 100,000 mechanical cyclesβ€”reliability that outlasts your toughest projects πŸ”§ - β€’ **Power Through Peaks:** Handles up to 500A surge current for those high-demand moments ⚑πŸ”₯ - β€’ **Plug & Play Installation:** Includes all necessary terminals and insulated caps for quick, hassle-free setup πŸ”© - β€’ **Premium Contact Materials:** Copper contacts with silver pins ensure superior conductivity and minimal power loss ⚑ - β€’ **Seamless Dual Battery Control:** Effortlessly isolate and manage double battery systems with a simple on/off switch πŸ”‹ ## Overview The MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay is a robust, high-performance electrical switch designed for dual battery management. Featuring an 80A continuous current rating, 500A surge capacity, and a remarkable 100,000 mechanical cycle lifespan, it ensures dependable operation in demanding automotive and power applications. Constructed with copper contacts and silver pins for optimal conductivity, it comes complete with installation hardware for seamless integration. ## Description Product description Good Saver To Your Battery Max Flash Amps 500Amp Dual Battery Isolator Relay Heavy Duty SPST relay Specifications Heavy Duty Sliver Contact Pin & QA-1/155 Copper Wire as Coil Reduce the Power Loss, Longer the Using Life Life Expectancy Electrical: 100,000 Operations (at 30 Operations/min) Water-Resistant The Black Plastic Shell and Potted Coil Interiors Protect Your Solenoid Against Any Harsh Environment Dustproof Tight Seals and Firmly Enclosed for Overall Protection from Dust, Dirt, Sand and Any Other Substance that Could Cause Damage to YOUR Solenoid. Replacement 100% OEM Match and Replacement you have a full year to make sure your solenoid relay meets your expectations ## Features - Double Batteries Isolator Control On/Off Switch; Continuous Amps: 80,Surge Max Amps:500 ,Voltage: 12VDC; 100,000 mechanical cycle life./Normally Open With Attaching Hardware, Copper Contact With Sliver Pins - Max Switching Currecnt could pass 500A 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 | #43,294 in Automotive ( See Top 100 in Automotive ) #16 in Automotive Replacement Starter Solenoids | | Brand | MaySpare | | Brand Name | MaySpare | | Coil Resistance | 18 Ohms | | Coil Voltage | 12 Volts | | Connector Type | Screw | | Contact Current Rating | 80 Amps | | Contact Material | Copper Silver | | Contact Type | Normally Open | | Current Rating | 80 Amps | | Customer Reviews | 4.4 out of 5 stars 467 Reviews | | Manufacturer | May Spare Parts | | Maximum Switching Current | 1 Amps | | Minimum Switching Voltage | 13 Volts (DC) | | 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 Degrees Celsius | | Wattage | 2000 watts | ## Product Details - **Connector Type:** Screw - **Contact Material:** Copper Silver - **Contact Type:** Normally Open - **Current Rating:** 80 Amps - **Mounting Type:** Screw Mount ## Images ![MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST - Image 1](https://m.media-amazon.com/images/I/61s9d9XXu2L.jpg) ![MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST - Image 2](https://m.media-amazon.com/images/I/81TjcTU7IwL.jpg) ![MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST - Image 3](https://m.media-amazon.com/images/I/71OCw-98X5L.jpg) ![MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST - Image 4](https://m.media-amazon.com/images/I/71q7HRcabZL.jpg) ![MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST - Image 5](https://m.media-amazon.com/images/I/71FBJThnKxL.jpg) ## 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 ### ⭐⭐⭐⭐⭐ Review *by A***R on February 23, 2026* ### ⭐⭐⭐⭐⭐ Review *by D***N on November 19, 2025* ### ⭐⭐⭐⭐⭐ Review *by B***R on July 19, 2025* --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter](https://www.desertcart.sg/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-05-05*