The K8AB-VS3 100/115VAC is discontinued per Omron's product lifecycle status. No direct replacement is listed in the evidence; sourcing is limited to surplus or broker channels.
This is a voltage sensing relay — it monitors an AC or DC voltage between 20 ~ 600V and trips its SPDT (1 Form C) output when the measured voltage deviates from the set point. The trip range is adjustable via front-panel potentiometer, and the delay time can be set from 0.1 Sec ~ 30 Sec to avoid nuisance trips on transients. The relay contacts are rated 6A @ 250VAC, suitable for signaling or switching small loads directly. Supply voltage is 100 ~ 115VAC — confirm your control voltage matches before wiring.