What the K8AB-TH12S Monitors — and Where It Fits
The K8AB-TH12S AC/DC24: This is a dedicated temperature monitoring relay, not a PID controller — it trips the SPDT output when the sensed temperature exceeds or falls below the setpoint, making it suitable for over-temperature alarm or under-temperature lockout in a control panel. The trip range spans 0°C to 1700°C, which covers the full output of common thermocouple types (K, N, E, J, T up to ~1200°C, and R, S, B up to 1700°C) as well as Pt100 RTDs at the low end — the actual sensor type and setpoint are configured on the unit. Mounts on standard 35 mm DIN rail (EN 60715) and requires a 24 VAC/DC control supply — a common rail voltage in industrial panels, so no separate power supply module is needed if 24 V is already available.
Output, Supply, and Environmental Limits
The SPDT relay contact is rated 3 A at 250 VAC — adequate for driving a pilot lamp, alarm horn, or the coil of a larger contactor for a shutdown circuit, but not for direct motor switching. Operating temperature range is -10°C to 55°C; if the relay is mounted inside an unventilated enclosure near heat-generating equipment (drives, transformers), verify the internal ambient stays below 55°C or the unit may drift out of specification. No built-in delay — the output responds immediately when the temperature crosses the setpoint threshold. If time-delayed alarm action is required, an external timer relay must be added in series.
Lifecycle Status — Obsolete, Sourced on Request
Available through independent surplus and broker channels. Quantities are lot-specific; availability and current pricing are confirmed at RFQ against your BOM line. For new designs or if a supported alternative is required, the closest functional match within the K8AB-TH family would be a current-production model — confirm the trip range, supply voltage, and output configuration against your application before specifying.