--- product_id: 15546048 title: "Technology Research (40100 50 Amp Surge Guard Automatic Transfer Switch,Black" brand: "southwire" price: "€ 237.14" currency: EUR in_stock: true reviews_count: 13 category: "Southwire" url: https://www.desertcart.pt/products/15546048-technology-research-40100-50-amp-surge-guard-automatic-transfer-switch store_origin: PT region: Portugal --- # 30-second automatic transfer delay 50 Amp surge protection Seamless shore-to-generator power switch Technology Research (40100 50 Amp Surge Guard Automatic Transfer Switch,Black **Brand:** southwire **Price:** € 237.14 **Availability:** ✅ In Stock ## Summary > ⚡ Stay powered, protected, and ahead on the road with Surge Guard’s smart transfer switch! ## Quick Answers - **What is this?** Technology Research (40100 50 Amp Surge Guard Automatic Transfer Switch,Black by southwire - **How much does it cost?** € 237.14 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/15546048-technology-research-40100-50-amp-surge-guard-automatic-transfer-switch) ## Best For - southwire enthusiasts ## Why This Product - Trusted southwire brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Automatic Power Transfer:** Experience hassle-free switching to generator power with a precise 30-second delay for ultimate reliability. - • **Bumper-to-Bumper RV Protection:** Safeguard your entire RV from faulty park power with permanent Surge Guard installation. - • **Smart Shore Power Re-engagement:** Shore power reactivates smoothly within 3-4 seconds after generator shutdown, keeping you connected without interruption. - • **Mechanical Interlocking Contactors:** Robust mechanical design ensures safe, fail-proof power switching every time. - • **Built for High-End Motorized Coaches:** Advanced monitoring and diagnostic features tailored for sophisticated RV power systems. ## Overview The Technology Research 40100 50 Amp Surge Guard Automatic Transfer Switch is a premium RV power management device that protects your vehicle from faulty park power while automatically switching between shore and generator power. Featuring mechanical interlocking contactors, a 30-second transfer delay, and seamless shore power reactivation, it ensures reliable, safe, and uninterrupted power for high-end motorized coaches. Compact yet robust, it supports up to 50 Amps and 6000 watts, making it an essential upgrade for any serious RV owner. ## Description TRC SURGE GUARD AUTOMATIC TRANSFER SWITCHES. Permanently install Surge Guard protection in your RV. Protects RV bumper to bumper from faulty park power. Due to the increased sophistication of high-end motorized coaches, the additional monitoring and diagnostic features plus the benefits of a transfer switch are a plus for some RV owners. Mechanical interlocking contactors. Time delay at power up. Transfers to generator power automatically when energized after 30 second delay. When both shore power and generator power are available, generator dominates after a 30 second delay. Once the generator is shut down, shore power activates after a 3-4 second delay. Review: The Unit has some weight to it but makes it feel like it's quality - Update 2016May7: I used some rubber washers that I found at lowes to put behind the mounting holes of the unit and now you can only hear the buzzing if you're standing directly in front of it trying to hear it. So far this has been in production for about a month now, and i haven't had any reason to worry. Works 100% as expected thus far. I have also posted a picture of what the actual unit looks like. I have added a Volt meter in the front of mine so I know what is going on so don't expect that when you order one. The unit is indeed plastic. The EMT holes are a considerable distance from anything you might be mounting it to so you'll need to bend pipe to get it in these holes. I drilled new ones lower for a cleaner install. The Unit has some weight to it but makes it feel like it's quality. There is a low buzzing coming from the unit. Nothing too crazy but a buzz none the less. I've only had the unit in operation for about 24 hours so far. I will post an update should I have any issues. This unit will be in operation 24/7 from here on. Review: Great price - Was exact replacement at a much better price. I originally bought a replacement contactor but this was much easier replacement ## Features - TRC SURGE GUARD AUTOMATIC TRANSFER SWITCHES - Permanently install Surge Guard protection in your RV - Protects RV bumper to bumper from faulty park power - Benefits of a transfer switch are a plus for some RV owners; mechanical interlocking contactors, time delay at power up, Transfers to generator power automatically when energized after 30 second delay ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00PVG2I3A | | Actuator Type | mechanical | | Batteries | 1 Unknown batteries required. | | Best Sellers Rank | #32,177 in Electronics ( See Top 100 in Electronics ) #219 in Surge Protectors | | Brand | Southwire | | Circuit Type | 2-way | | Color | Multi | | Compatible Devices | RV power systems | | Connectivity Protocol | X-10 | | Connector Type | 4-pin Mini Din | | Contact Material | Metal | | Contact Type | Normally Open | | Control Method | Touch | | Control Type | automatic | | Current Rating | 50 Amps | | Customer Reviews | 4.3 4.3 out of 5 stars (235) | | Date First Available | November 19, 2014 | | Global Trade Identification Number | 00024098401006 | | International Protection Rating | IP40 | | Is Discontinued By Manufacturer | No | | Item Weight | 6 pounds | | Item dimensions L x W x H | 13.5 x 9.13 x 6 inches | | Item model number | 40100 | | Manufacturer | Technology Research | | Manufacturer Part Number | 40100 | | Model | 40100 | | Number of Items | 1 | | Number of Positions | 2 | | Operating Voltage | 120 Volts (AC) | | Operation Mode | automatic | | Product Dimensions | 13.5 x 9.13 x 6 inches | | Terminal | Physical | | UPC | 024098401006 | | Unit Count | 1.0 Count | | Upper Temperature Rating | 130 Degrees Fahrenheit | | Vehicle Service Type | Recreational Vehicle (RV) | | Voltage | 1 Volts | | Wattage | 6000 watts | ## Product Details - **Brand:** Southwire - **Connector Type:** 4-pin Mini Din - **Contact Type:** Normally Open - **Current Rating:** 50 Amps - **Item dimensions L x W x H:** 13.5 x 9.13 x 6 inches - **Material:** Blend - **Operating Voltage:** 120 Volts (AC) - **Operation Mode:** automatic - **Switch Type:** Mechanical Interlocking Contactors - **Terminal:** Physical ## Images ![Technology Research (40100 50 Amp Surge Guard Automatic Transfer Switch,Black - Image 1](https://m.media-amazon.com/images/I/51rPtteDaaL.jpg) ## Questions & Answers **Q: I have an inverter, generator and shore power. my current transfer switch is an old iota. will the 40100 work and are the wiring diagrams any good?** A: Yes, I just used this to replace my Iota. **Q: Can this be used in a small home outside of the US where regulations are not so strict?** A: Food Trucks used **Q: Will this replace a model 41260?** A: you should call south wire i think it will i have a 2020 Berkshire 45A XLT it fits that for sure just be care full mark all the wires and take pictures if you mix up the wires it will start a fire **Q: i have a 94 pace arrow in need of this item , I am a pretty good diy guy , is it a hard or unsafe replacement job? thanks** A: Not unsafe as long as the generator isn't running and you don't have the coach plugged into the wall. I just labeled the old wires and took a couple photos of it before taking it apart to make sure I didn't mix the feeds up and then the install took less than an hour so it should be pretty straight forward as long as you are able to get to the area easily. Good Luck :) ## Customer Reviews ### ⭐⭐⭐⭐⭐ The Unit has some weight to it but makes it feel like it's quality *by J***P on March 25, 2016* Update 2016May7: I used some rubber washers that I found at lowes to put behind the mounting holes of the unit and now you can only hear the buzzing if you're standing directly in front of it trying to hear it. So far this has been in production for about a month now, and i haven't had any reason to worry. Works 100% as expected thus far. I have also posted a picture of what the actual unit looks like. I have added a Volt meter in the front of mine so I know what is going on so don't expect that when you order one. The unit is indeed plastic. The EMT holes are a considerable distance from anything you might be mounting it to so you'll need to bend pipe to get it in these holes. I drilled new ones lower for a cleaner install. The Unit has some weight to it but makes it feel like it's quality. There is a low buzzing coming from the unit. Nothing too crazy but a buzz none the less. I've only had the unit in operation for about 24 hours so far. I will post an update should I have any issues. This unit will be in operation 24/7 from here on. ### ⭐⭐⭐⭐⭐ Great price *by T***Y on January 15, 2026* Was exact replacement at a much better price. I originally bought a replacement contactor but this was much easier replacement ### ⭐⭐⭐⭐⭐ Good Purchase. *by J***S on January 25, 2016* The original one of these on my 1993 Winnebago Elante fried during power surges as we had our recent winter storms. No one local had this item in stock and Camping World wanted $180 for theirs which they would have to order. I was able to get this item with my Amazon Prime not only at a cheaper rate than CW but also quicker. My electrician installed it in under an hour and I've had zero issues. Seems to be working GREAT. I've been running on shore power with it since the install. If we try it on Generator power and have issues, I'll update the review. --- ## 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.pt/products/15546048-technology-research-40100-50-amp-surge-guard-automatic-transfer-switch](https://www.desertcart.pt/products/15546048-technology-research-40100-50-amp-surge-guard-automatic-transfer-switch) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-04-25*