This is a 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. <br><br>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.