The Autonics TF33-21A-T Module is a regulator, NTC temperature, SPST-NO, SPST-NO, panel and 24VAC combination component, used for a variety of purposes. This component contains two single-pole single-throw (SPST) normally open (NO) contacts, an NTC temperature regulator with adjustable sensitivity and a 24VAC protected output panel. The TF33-21A-T also contains a thermistor, which functions as a temperature control device; it is connected to the NTC temperature regulator, allowing the temperature setting of the output module to be adjusted according to ambient temperature changes. This component also includes protection from overloads and accidental reverse current by using built-in protection circuits, as well as a normally open contact for fault indication, a reset function and built-in LED for visual indication. The TF33-21A-T is suitable for a variety of applications, such as controlling fans, pumps and compressors, lighting, heating and cooling systems.