What it is and where it fits
The Omron K8AK-TH12S 100-240VAC is a temperature monitoring relay that triggers an SPDT relay output when a thermocouple signal deviates from set thresholds. Rated for 100-240VAC supply — covers common line voltages in a single variant. The SPDT contact switches 5 A at 250 VAC, sufficient for alarm annunciation or pilot duty loads. No built-in delay; the relay responds immediately to a trip condition. Mounts on a DIN rail in the control panel. Operating range -20°C to 55°C suits ventilated enclosures.