The International Environmental Corporation (IEC) E045-50012002 Transformer (also known as TB402424-B21B77) is a genuine OEM step-down transformer used in HVAC systems to convert 208/240V AC input to 24V AC output. With a 40VA power rating, it delivers stable control voltage for thermostats, relays, and control boards in fan coils and air-handling units. Built to meet IEC specifications, this transformer ensures safe and consistent low-voltage power delivery. Key Features Converts 208/240V input to 24V output Rated at 40VA, suitable for HVAC control circuits 60Hz frequency for North American systems OEM part ensures accurate fit and function Enables safe low-voltage control of HVAC components Specifications Part Numbers: E045-50012002, TB402424-B21B77 Primary Voltage: 208/240V AC Secondary Voltage: 24V AC Frequency: 60Hz Power Rating: 40VA Application: Control transformer for HVAC units Brand: International Environmental Corporation (IEC) Compatible Models HXY16 LHW04D6 LHW03D6 Also compatible with various IEC fan coil units and terminal HVAC systems Why Choose This Item The IEC E045-50012002 / TB402424-B21B77 Transformer ensures safe and reliable low-voltage control in commercial HVAC equipment. As a genuine OEM transformer, it provides correct voltage regulation, system protection, and seamless integration, making it the ideal choice for service professionals and facility managers maintaining IEC systems.