What is herm on a capacitor?

A herm on a capacitor refers to the terminal where the start winding lead is connected in a capacitor start capacitor run motor. The herm terminal is often used for the compressor in an HVAC system or other industrial applications.

In a capacitor start capacitor run motor, the herm terminal is connected to the start winding lead to provide additional torque to help the motor start. The capacitor helps to correct the phase angle between the start and run windings, allowing the motor to start more efficiently.

The herm terminal is typically labeled on the capacitor and is often connected to a hermetically sealed compressor in HVAC systems. It is important to properly connect the herm terminal to the correct lead to ensure the motor operates correctly and efficiently.