--- product_id: 118177027 title: "Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446" brand: "endurance pro" price: "32 zł" currency: PLN in_stock: false reviews_count: 8 url: https://www.desertcart.pl/products/118177027-endurance-pro-ei-type-isolation-transformers-pri-120-208-240 store_origin: PL region: Poland --- # 40 VA Power Rating 120/208/240 V AC Input Compact 4.1 x 2.8 x 2.7 in Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 **Brand:** endurance pro **Price:** 32 zł **Availability:** ❌ Out of Stock ## Summary > 🔋 Power Up Your HVAC Game! ## Quick Answers - **What is this?** Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 by endurance pro - **How much does it cost?** 32 zł with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/118177027-endurance-pro-ei-type-isolation-transformers-pri-120-208-240) ## 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 - • **Compact Design:** Space-saving dimensions (4.1 x 2.8 x 2.7 inches) fit seamlessly into your setup. - • **Safety Assured:** UL/CSA approved for peace of mind and long-lasting performance. - • **Versatile Voltage:** Compatible with 120/208/240 V AC, ensuring flexibility in various applications. - • **Hassle-Free Warranty:** Enjoy a 1-year no questions asked warranty for risk-free shopping. - • **Powerful Performance:** Delivers a robust 40 VA power rating for reliable operation. ## Overview The Endurance ProEI Type Isolation Transformer is engineered for industrial heating and air conditioning controls, providing reliable performance with a primary voltage range of 120/208/240 V AC and a secondary voltage of 24 V AC. With a compact design and UL/CSA approval, this transformer is a safe and efficient choice for various applications, backed by a 1-year warranty. ## Description Product description Product Description Product Dimensions 4.1 x 2.8 x 2.7" Primary Voltage: 120/208/240 (Secondary Voltage: 24) UL/CSA approved parts assure safe operation and long life. Replacement For Parts Jard 4031F Mars 50203 Armstrong TWF424-40 Gemline GT446 Robertshaw 620-206, 620-406, 620-482 Supco SXT105 White-Rodgers GT4031F, 90-T40F3 Grainger 6WU91 UEI UET105, UET115 Honeywell AT140A1018, AT40A1121, AT40A1139, AT40B1214 Source 1 S1-T2404F Packard PF42440 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: Works As Expected - I connected it to a 120v source and confirmed 24 volts were coming out of the secondary side. Its easy to setup and works as expected. Review: Good replacement - I got this as a replacement for the unavailable transformer for my Mr. Heater Big Maxx garage heater. Works great. The only negative is that it is larger than the old one, but it's not a direct replacement either. Anyhow it works and I have heat in my garage and that's what's important. ## Features - [Product description] This transformer is designed for use in industrial, heating and air conditioning controls, including thermostats, air conditioning circuits, relays, gas valves and other applications that do not exceed the listed rating - [Product specifications] Primary Voltage: 120/208/240 V AC ,WHT-BLK-RED-ORG. Secondary Voltage: 24 V AC, RED-GRN. Power Rating：40 VA - [Product dimensions] 4.1 x 2.8 x 2.7 inches - [Replacement for] Gemline GT446,Supco SXT105,UEI UET105, UET115,Grainger 6WU91,Jard 4031F,Mars 50203,White-Rodgers GT4031F, 90-T40F3,Grainger 6WU91,Armstrong TWF424-40,Source 1 S1-T2404F,Packard PF42440,Robertshaw 620-206, 620-406, 620-482,Honeywell AT140A1018, AT40A1121, AT40A1139, AT40B1214. - [Risk free shopping] UL/CSA approved parts assure safe operation and long life. This Endurance Pro part by Supply Edge comes with a 1 year no questions asked warr anty. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07PPK4Y9Z | | Best Sellers Rank | #625,816 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #761 in HVAC Controls | | Brand | Endurance Pro | | Brand Name | Endurance Pro | | Customer Reviews | 4.4 out of 5 stars 376 Reviews | | Item Dimensions D x W x H | 2.7"D x 2.8"W x 2.7"H | | Item Weight | 1.56 Pounds | | Manufacturer | Endurance Pro | | Maximum Frequency | 60 Hz | | Minimum Frequency | 50 Hz | | Model | 42440, 4031F | | Mounting Type | Foot Mount | | Part Number | 42440, 4031F | | Power Source | Corded Electric | | Product Dimensions | 2.7"D x 2.8"W x 2.7"H | | Specification Met | CSA, UL | | UPC | 816325012914 | ## Product Details - **Brand:** Endurance Pro - **Power Source:** Corded Electric - **Product Dimensions:** 2.7"D x 2.8"W x 2.7"H - **Mounting Type:** Foot Mount - **Specification Met:** CSA, UL ## Images ![Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 - Image 1](https://m.media-amazon.com/images/I/81duAi4xOmL.jpg) ![Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 - Image 2](https://m.media-amazon.com/images/I/61xR4pMewxL.jpg) ![Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 - Image 3](https://m.media-amazon.com/images/I/71v7FbCmhuL.jpg) ![Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 - Image 4](https://m.media-amazon.com/images/I/71J1JW1Pt1L.jpg) ![Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 - Image 5](https://m.media-amazon.com/images/I/7141YLXXhNL.jpg) ## Questions & Answers **Q: Do you have a Class 2 Transformer, 12vac, 1.67A Foot for a small desk lamp?** A: Sorry for the delay been really busy,Yes I Do. **Q: Does it works for a ring doorbell which requeriments: 16–24 v de ca, 10–40 va, 50/60 hz? thanks** A: Yes it will just make sure you do your wires correctly **Q: I'm hooking up a transformer with green and red 24 v wires to a furnace with blue and yellow wires which wires go where** A: Your choice it's all the same. You can use a multy meter and check if blue or yellow is ground but it wont be, only D.C. would have a ground **Q: Could this work with gas rheem ruud furnace and smart thermostat?** A: You have to check the voltage and current ratings. The voltage must match exactly and current provided by the old unit must be less than or equal to the ratings on the replacement transformer. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works As Expected *by M***S on July 18, 2025* I connected it to a 120v source and confirmed 24 volts were coming out of the secondary side. Its easy to setup and works as expected. ### ⭐⭐⭐⭐⭐ Good replacement *by J***L on November 29, 2021* I got this as a replacement for the unavailable transformer for my Mr. Heater Big Maxx garage heater. Works great. The only negative is that it is larger than the old one, but it's not a direct replacement either. Anyhow it works and I have heat in my garage and that's what's important. ### ⭐⭐⭐⭐⭐ Bang for buck *by M***M on May 30, 2023* Goodman air handler already had a aftermarket transformer installed, fan would not come on intermittently. This was a third the cost of an original replacement. We went for it and it works just fine. Inexpensive fix for my 24yr old central ac that blows colder than the new junk. ## Frequently Bought Together - Endurance Pro EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446 - Dreyoo 1 Pcs 24V Coil 40A 2 Pole Air Conditioner Contactor, UL Certified HVAC Motor Contactor, Air Conditioner Replacement Relay, Compatible with C230b, Heat Pump, Refrigeration Systems - Supco 90370 General Purpose Fan Relay, 12 A Load Current, 24 V Coil Voltage, Single Pole Double Throw Contacts --- ## 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.pl/products/118177027-endurance-pro-ei-type-isolation-transformers-pri-120-208-240](https://www.desertcart.pl/products/118177027-endurance-pro-ei-type-isolation-transformers-pri-120-208-240) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-13*