"2-SPDT
The T678F1002 Series 2-Stage Change-Over Controllers provide the operator with a choice of ON/OFF or ON/OFF plus a programmable set point for maximum control flexibility. The preset supervises a free air circulating or direct liquid line heating system. Solid state electronics and proven phase-cut motor start relay assure efficient, reliable operation in the most demanding applications. Easy to install and operate, the controllers offer fully adjustable controls using simple on/off and set point knobs."
Auto Changeover Switch