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The IEC TB402424-B21B77 transformer is an OEM step-down transformer engineered to convert 208V or 240V input into a stable 24V output. With a 40VA power rating, this transformer is commonly used in HVAC control systems, supplying low-voltage power to thermostats, relays, and safety devices across various IEC fan coil and terminal unit models. Key Features Converts 208/240V AC input to 24V AC output 40VA power rating supports a wide range of control applications Designed for 60Hz systems OEM transformer ensures perfect compatibility and performance Provides safe and reliable power to HVAC control circuits Specifications Part Number: TB402424-B21B77 Input Voltage: 208V / 240V Output Voltage: 24V Power Rating: 40 VA Frequency: 60 Hz Type: Step-down transformer Application: HVAC systems, control circuits Compatible Models IEC HXY16 IEC LHW04D6 IEC LHW03D6 IEC RXL04 IEC RXL06 IEC LHW02B4 IEC LHP04B6 IEC HWX14 IEC FCU36 IEC UDL03 Why Choose This Item This OEM transformer is the ideal solution for delivering consistent low-voltage power in IEC HVAC systems. Built for durability, efficiency, and safety, it supports optimal operation of fan coils and control boards, making it a trusted choice for maintenance professionals and facility managers.