The Omron K8DT-VS3TD is a single-phase voltage monitoring relay built for the kind of control panels you see out here in the grease — DIN rail mount, PC case, and simple screw terminals. It runs on a 24 VAC/VDC supply, so it plays nice with your existing control transformer or power supply without needing a separate module.
What the ranges mean on the bench
Selectable voltage spans include 20–200 V, 30–300 V, and 60–600 V AC/DC, covering ranges from a 24 VDC sensor loop to a 600 VAC circuit. The relay switches between overvoltage or undervoltage detection.
Sourcing note — still in production
Active and current production, per Omron's own status. No end-of-life date on the horizon, which means this relay stays a solid line-item on your BOM for new builds and MRO spares alike. Quoted to order against a standard RFQ — lead times are typical for this class.