The Siemens 3UG4622-2AA30 is a SIRIUS current monitoring relay with digital setting — meaning the trip thresholds and delays are set via the front-panel interface, not a trim pot. It monitors single-phase AC/DC current from 0.05 A up to 10 A (the measurable range extends to 15 A), and provides an SPDT relay output rated 3 A at 250 V AC or 400 V AC. The LCD display shows the actual current value and parameter settings, which simplifies commissioning compared to a relay with only LEDs.
The adjustable current range is 0.05–10 A, but the measurable range goes to 15 A — so the relay can read a current above its trip setting for diagnostics, but the trip adjustment stops at 10 A. The start-up delay is adjustable from 0.1 to 20 s, which lets you ride through motor inrush without nuisance tripping. Auto-reset and external reset are both supported, so the relay can be configured for automatic restart or manual reset from a panel pushbutton. The output relay is rated 3 A at 250 V AC and also at 400 V AC, which covers most control circuit voltages in industrial panels.