Hartland Controls CON-AUX300-2 2-SPDT 3-Pole Auxiliary Switch

The Hartland Controls CON-AUX300-2 Auxiliary Switch is an electrical component designed to mount on compatible 3-pole control systems. It provides two SPDT switching circuits that operate mechanically in the main contactor, allowing additional low-voltage control or it operates without carrying the main load current in HVAC systems applications. It is used to signal control boards, interlock compressors or fans, and switch secondary systems such as crankcase heaters or defrost controls depending on contactor conduction. Installed directly on the contactor body, it becomes part of the switching mechanism and control the logic of the system within heating, ventilation, and air conditioning equipment.