--- product_id: 138876120 title: "Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson" brand: "endurance pro" price: "€ 12.23" currency: EUR in_stock: false reviews_count: 8 url: https://www.desertcart.gr/products/138876120-endurance-pro-90-t40f3-class-2-transformers-thermostat-energy-limiting store_origin: GR region: Greece --- # 24V Power Corded Electric Easy Installation Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson **Brand:** endurance pro **Price:** € 12.23 **Availability:** ❌ Out of Stock ## Summary > 🔧 Transform Your Control Game! ## Quick Answers - **What is this?** Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson by endurance pro - **How much does it cost?** € 12.23 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/138876120-endurance-pro-90-t40f3-class-2-transformers-thermostat-energy-limiting) ## Best For - endurance pro enthusiasts ## Why This Product - Trusted endurance pro brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Risk-Free Purchase:** Comes with a 1-year warranty for peace of mind. - • **Durable Construction:** Built for industrial applications, ensuring longevity and reliability. - • **Powerful Performance:** Designed for 24V AC control systems, ensuring reliable operation. - • **User-Friendly Design:** Color-coded leads simplify installation for a hassle-free setup. - • **Versatile Compatibility:** Replaces various transformers with equal or smaller VA ratings. ## Overview The Endurance Pro 90-T40F3 Class 2 Transformers Thermostat is a robust and versatile solution for your HVAC needs, designed to operate seamlessly in 24V AC control systems. With easy installation features and a 1-year warranty, it’s the perfect choice for professionals seeking reliability and efficiency. ## Description Product description Product Description This is an Endurance Pro 90-T40F3 Class 2 Transformers Thermostat, Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson. Primary: 120/208/240V, 50/60Hz, White, Black, Red, Orange Secondary: 24V, 40VA, Blue, Brown Color coded primary leads for easy installation. Instructions included. Manufacturers’ part numbers are solely for identification. All materials supplied by us are our replacements for manufacturers’ parts. All product and company names are trademarks or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. Review: Good transformer - This was a replacement for a 40 year old air conditioner control power transformer that failed (presumably due to age). This was the least expensive transformer I could find either on-line or locally of this rating so I was concerned about quality, but it has worked for a month, so it will likely last for a long time. It runs fairly cool to the touch, even when powering the load (2 small contactor coils and the t-stat compensator). From physical appearance it appears to be well constructed. I'm glad I didn't spend more money. For those that are interested in such things, it was installed using the 120V primary tap and the output voltage with no load was about 28VAC, about what I expected it to be. Review: Worked to replace a blown transformer in our split Ruud heat pump. - The transformer went out in our heat pump sometime during the night, and being the weekend the appliance parts stores near me were closed. So I ordered this for same day delivery, and for the price was not disappointed, the wire colors were slightly different, but I followed the diagrams on both transformers and got it reinstalled and my heat back working by the evening! Thanks desertcart, saved me a ton of money vs calling a repairman. I installed the transformer and it is currently working in our split Ruud heat pump unit. I wiil update if I have any issues with longevity. ## Features - [Product description]: Endurance Pro 90-T40F3 Class 2 Transformers Thermostat, Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson. The transformers are designed for use in 24, 12, or 2.5 Volts AC control system, including air conditioning circuits, thermostats, gas valves, relays and or other applications that do not exceed the listed ratings. It can be used to replace any transformers of same primary voltage and equal or smaller VA ratings. - [Specification]: Primary: 120/208/240V, 50/60Hz, White, Black, Red, Orange, Secondary: 24V, 40VA, Blue, Brown - [Usage]: For industrial, heating and air conditioning controls applications. Foot Mounting - [Ease of use]: Color coded primary leads for easy installation. Instructions included. - [Risk free shopping]: This part by Endurance Pro come with a 1 year, no questions asked, no hassle war ranty. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07RS5C41J | | Backlight | No | | Best Sellers Rank | #686,030 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #556 in Home Thermostat Accessories | | Brand | Endurance Pro | | Brand Name | Endurance Pro | | Color | Black | | Connectivity Protocol | BACnet MS/TP | | Connectivity Technology | Wired | | Control Method | Touch | | Control Type | Voice Control | | Controller Type | touch | | Customer Reviews | 4.4 out of 5 stars 469 Reviews | | Display Type | touchscreen | | Included Components | Foot Mount, Transistor, Diode, Capacitor | | Item Weight | 1.26 Pounds | | Manufacturer | Endurance Pro | | Manufacturer Part Number | 6080-110: 90-T40F3, 40301F | | Model Name | Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson Model Name Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson See more | | Model Number | 90-T40F3, 40301F, 90T40F3 | | Mounting Type | Foot Mount | | Power Source | Corded Electric | | Product Style | Industrial | | Specific Uses For Product | Air Conditioning Circuits, Thermostats, Gas Valves, Relays | | Temperature Control Type | Manual | | UPC | 816325013409 | | Unit Count | 1 Count | | Voltage | 24 Volts | ## Images ![Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson - Image 1](https://m.media-amazon.com/images/I/61kKE1SQMmL.jpg) ![Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson - Image 2](https://m.media-amazon.com/images/I/610x41qEGwL.jpg) ![Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson - Image 3](https://m.media-amazon.com/images/I/619k5NgZazL.jpg) ![Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson - Image 4](https://m.media-amazon.com/images/I/61dLnFxT7vL.jpg) ![Endurance Pro 90-T40F3 Class 2 Transformers Thermostat Energy Limiting with Foot Mount, 24V Replacement for White Rodgers Emerson - Image 5](https://m.media-amazon.com/images/I/61B6RDYr6bL.jpg) ## Questions & Answers **Q: Is the blue or brown wire common on 24v side** A: There is no "common" on the 24 vac side. The 24 vac side (secondary) is electrically isolated from the input side (primary). **Q: Can this be used for 18 volts AC and no more than 1.5 amps** A: Yes, but not easily. The safe & easy way would be to use a variable transformer: https://www.amazon.com/Mophorn-Variable-Transformer-Voltage-Converter/dp/B07XKXQXWL/ref=sr_1_6?dchild=1&keywords=variable+transformer&qid=1594088888&s=electronics&sr=1-6 **Q: Is the output 24 v ac volts** A: yes **Q: Can this be hooked up to both a relay and the c/r for thermostat? If so how?** A: If you're wanting to energize a relay along with the contactor then that shouldn't be a problem. Make sure the coil of the contactor and relay combined are below the transformer VA capacity and that the relay has a 24vac coil. With that you should be able to connect the relay coil in parallel with the contactor coil. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good transformer *by D***C on May 25, 2022* This was a replacement for a 40 year old air conditioner control power transformer that failed (presumably due to age). This was the least expensive transformer I could find either on-line or locally of this rating so I was concerned about quality, but it has worked for a month, so it will likely last for a long time. It runs fairly cool to the touch, even when powering the load (2 small contactor coils and the t-stat compensator). From physical appearance it appears to be well constructed. I'm glad I didn't spend more money. For those that are interested in such things, it was installed using the 120V primary tap and the output voltage with no load was about 28VAC, about what I expected it to be. ### ⭐⭐⭐⭐⭐ Worked to replace a blown transformer in our split Ruud heat pump. *by R***N on December 8, 2019* The transformer went out in our heat pump sometime during the night, and being the weekend the appliance parts stores near me were closed. So I ordered this for same day delivery, and for the price was not disappointed, the wire colors were slightly different, but I followed the diagrams on both transformers and got it reinstalled and my heat back working by the evening! Thanks Amazon, saved me a ton of money vs calling a repairman. I installed the transformer and it is currently working in our split Ruud heat pump unit. I wiil update if I have any issues with longevity. ### ⭐⭐⭐⭐ Does the job but doesn't seem to be made nearly as well as original equipment. *by D***D on April 5, 2022* I used this to replace the low voltage transformer on my circa 1993 FHP "water chilled" Heat Pump. The low voltage is used to power the thermostat, blower motor relay, compressor relay and the heat pump flow reversing valve relay. It works, and wiring was pretty simple but I wouldn't try installing this if you don't know what you are doing as you could easily fry those relays and your thermostat if you wire it incorrectly. I'm getting 27vac which is a little high but I guess that's just the low quality rearing it's ugly head (made in China like everything else these days? :-( ). This was a temporary fix anyway until I can get an OEM replacement. --- ## 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.gr/products/138876120-endurance-pro-90-t40f3-class-2-transformers-thermostat-energy-limiting](https://www.desertcart.gr/products/138876120-endurance-pro-90-t40f3-class-2-transformers-thermostat-energy-limiting) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-07-05*