What it is and what it needs
The K8AB-TH11S AC/DC24 is a DIN-rail temperature monitoring relay from Omron's K8AB-TH series. It trips an SPDT (1 Form C) output when the sensed temperature crosses the setpoint within the 0°C to 399°C range. Supply voltage is 24VAC/DC; the relay contacts are rated for 3A at 250VAC.