MARS 39004 Switch The compact design and standard

The compact design and standard mounting flange allow for rapid integration into existing control strings

making it a staple for any HVAC repair kit

Using this coil on a 50Hz supply will result in overheating and potential coil burnout due to the difference in inductive reactance

" If the plastic has become brittle or shows signs of leakage near the base

Manufactured from durable high-temperature gasket material to resist degradation in extreme operating conditions

MARS 39004 Switch The compact design and standardThe MARS 39004 is a professional grade 390 Series SPDT Changeover Switch designed for automatic seasonal transition in hydronic heating and cooling systems. Specifically engineered for fan coil units, this summer winter changeover switch manages thermostat logic based on water temperature, ensuring seamless climate control without manual intervention. It features a high reliability SL 8 thermostat enclosed in a sealed case for environment protection