The Caloritech™ 566 Base Load Step Control is made up of a mother board and 1 to 5 output boards, each with 4 outputs, for a maximum of 20 stages. Time delay between stages is independently adjustable for up and down sequencing from 1 to 200 seconds per stage.

This step control can operate in base load control mode by receiving a signal from an SCR. It can also operate in standard step control mode receiving process signals directly from a control.