Description
The Bosch HVAC 78191 Transformer 120V is an electrical step-down unit used to convert standard line voltage into a lower control voltage required for the safe operation of air conditioning control circuits. It operates by transferring energy through electromagnetic induction, maintaining a stable and isolated power supply for sensitive controls and relays. Located within HVAC systems in furnaces or control panels, it supports consistent electrical distribution to thermostats, boards, and safety parts. It ensures stable system control, protects low-voltage circuits from instability, and delivers dependable performance for continuous heating and cooling operation.
