The 3UG3522-1AG20: It monitors current from 0.1 A up to 10 A, works on AC or DC, and switches a single changeover (CO) contact. The control supply is AC 120 V at 50/60 Hz. That 0.1 A floor matters: it'll catch a partial winding failure or a lightly loaded motor that's still drawing something, not just a dead open. Screw terminals, no removable terminal blocks for main or control circuits, so plan for direct wiring.
The 0.1…10 A AC/DC range is the setpoint adjustment band, not the contact rating. You dial in the trip threshold within that window. The single CO contact is rated for the control circuit it switches — typically a PLC input or a contactor coil — not for direct motor loads. The AC 120 V control supply is the relay's own operating voltage, not the monitored circuit voltage.