The Omron K8AK-TH11S 100-240VAC is a temperature monitoring relay from the K8AK series, designed to supervise process or equipment temperature and switch a SPDT (1 Form C) relay output when the measured temperature deviates from setpoint.
The SPDT relay contact is rated 5 A at 250 VAC, which covers direct switching of small contactors, pilot lights, or PLC digital inputs up to that load. For higher inrush loads (e.g., motor starter coils), an interposing relay is recommended to keep the internal contacts within their resistive switching curve. Supply voltage is 100–240 VAC, covering common line voltages across global industrial sites without needing a separate control transformer. The wide operating temperature range of -20°C to 55°C suits unheated enclosures or outdoor cabinets in temperate climates.