IR33-DN33Universale Thermostat only is a series of controllers suitable for temperature control in air-conditioning, refrigeration and heating units. The models differ based on the type of power supply: 115 to 230 Vac or 12 to 24 Vac, 12 to 30Vdc;
and the type of the outputs
one, two, four relays,
four PWM outputs for controlling external solid state relays (SSR),
one or two relays with one or two 0 to 10 Vdc analogue outputs (AO).