This MARS Blue Box series component provides the necessary phase shift for starting and running both the compressor and the condenser fan motor in residential and commercial air conditioning systems

Always use the included gasket for NPS connections

and various RBM-style Type 184 relays

The Nordyne 01-0115 Contactor is a specific OEM replacement contactor engineered for heavy-duty switching in residential and light commercial HVAC systems

Trane THT2243 Thermostat This MARS Blue Box seriesThe Trane THT2243 Thermostat is a heavy duty 240V SPST thermostat specifically engineered as a limit control and temperature regulator for commercial and residential condenser units. Operating as a single pole, single throw (SPST) switch, this component is designed for 105Op73Cl operation, meaning it triggers an open circuit at 105F and restores the connection when temperatures drop to 73F. Professional technicians rely on this OEM replacement part