--- product_id: 123043634 title: "500 AMP Battery Isolator Relay" brand: "mayspare" price: "MX$1088" currency: MXN in_stock: true category: "May Spare" url: https://www.desertcart.mx/products/123043634-500-amp-battery-isolator-relay store_origin: MX region: Mexico --- # 80A continuous current 500A surge max amps 100,000 mechanical cycles 500 AMP Battery Isolator Relay **Brand:** mayspare **Price:** MX$1088 **Availability:** ✅ In Stock ## Summary > ⚡ Stay powered, stay ahead — the isolator that never quits! ## Quick Answers - **What is this?** 500 AMP Battery Isolator Relay by mayspare - **How much does it cost?** MX$1088 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/123043634-500-amp-battery-isolator-relay) ## 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 unmatched durability - • **Surge Ready for Action:** Handles up to 500A surge current at lightning-fast 5ms switching - • **Plug & Play Installation:** Includes 4 large 100A terminals and insulated caps for hassle-free setup - • **Premium Contact Materials:** Copper contacts with silver pins for superior conductivity and minimal resistance - • **Power Through the Long Haul:** Continuous 80A current rating for reliable all-day performance ## Overview The MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay is a high-performance, durable electrical switch designed for dual battery systems. With an 80A continuous current rating, 500A surge capacity, and a robust 100,000 mechanical cycle lifespan, it ensures reliable power management and seamless battery isolation. Featuring copper-silver contacts and a user-friendly installation kit, this relay is engineered for professionals demanding efficiency and longevity in automotive and industrial applications. ## Description Buy MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST: Solenoids - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## 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 | #33,949 in Automotive ( See Top 100 in Automotive ) #13 in Automotive Replacement Starter Solenoids | | 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 | 4.5 4.5 out of 5 stars (468) | | 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 ![500 AMP Battery Isolator Relay - 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. --- ## 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.mx/products/123043634-500-amp-battery-isolator-relay](https://www.desertcart.mx/products/123043634-500-amp-battery-isolator-relay) --- *Product available on Desertcart Mexico* *Store origin: MX* *Last updated: 2026-07-23*