It monitors rotation speed from 0.1 to 600 1/min across four ranges, powered by AC 24 V at 50/60 Hz, and switches a single changeover contact (1 CO) on screw terminals. The 1 % relative repeat accuracy means once you set the trip point, it stays consistent cycle to cycle — no drift from thermal or aging effects within the rated band. Initial value is 1.1 and full-scale value is 0.8 — these set the under-speed threshold window relative to the configured range. Delayed switching (1) is built in, so momentary slowdowns from belt slip or load bumps won't trigger a false trip.
The operating range is not explicitly listed but the storage spec gives a practical handling envelope.