This is a controller for electric heating elements. It controls single-phase 230 VAC or two-phase 400 VAC electric heating elements. Time-proportional control - TRIAC technology - is used to control the heating element. The ambient temperature is measured via the integrated PT500 temperature probe. The day and night temperatures can be set via two integrated potentiometers. An optional external potentiometer can be connected to adjust the setpoint remotely. There is one digital input for remote ON-OFF switching and one digital input to switch between a day and night temperature setpoint. The maximum (resistive) load is 3,2 kW / 6 kW.