The Siemens Industrial Controls 14GUG32AA 3Ph 3-Pole 120/240V Heavy Duty Motor Starter is a heavy-duty motor starter used to start and operate three-phase electric motors in a variety of industrial applications, including HVAC systems. It works by delivering electricity to the motor through its three poles in a safe and regulated manner. The starter connects the motor windings to the power supply when it receives a control signal. Using inbuilt overload safety systems that stop the current flow if an excessive current is detected, also protects the motor from overload circumstances. For safety or maintenance reasons, the starter can also cut the engine off from the power source.