Low-cost analogue/digital temperature controller with "ON-OFF" or proportional band switching behaviour (as the set-point temperature is approached, the switched time becomes shorter and shorter in order to keep any overshoot as low as possible).
The set-point is adjusted via a rotary dial on a 0 to 400 °C scale.
The actual value is shown on a 3- digit 7-segment display.
If the sensor circuit is interrupted, the relay will not be actuated.