Tecumseh 8209660H39 Relay ST 9660C-041-166 is an electrical start relay designed to assist compressor startup in compatible refrigeration and HVAC systems. It works by temporarily directing current to the compressor’s start winding during startup and then disconnecting it once normal operating speed is reached. This relay is commonly used in refrigeration units, condensing systems, an... https://www.partshnc.com/8209660h39-tecumseh-relay-st-9660c-041-166