The Siemens 3UG3014-1BS60 is a SIRIUS active power monitoring relay that tracks real power consumption on three-phase 490-660 V AC networks at 50 or 60 Hz. It measures line current from 0.2 to 10 A via external CTs and compares the calculated power against adjustable under- and over-limit thresholds. When a limit is violated, the relay's changeover contacts switch after a configurable delay — 0.5 to 20 s for limit violations, or 0.3 to 3 s on starting. This makes it a fit for monitoring motor load, pump dry-run protection, or conveyor belt slip detection where a drop in absorbed power signals a mechanical fault.
The measurable current span of 0.2-10 A means external current transformers are needed for motor circuits drawing more than 10 A; the relay itself sees only the CT secondary. Repeat accuracy of 1 % and metering precision of 10 % tell you this is a threshold monitor, not a revenue-grade meter — it catches a 10 % power drop reliably, but don't expect it to log kW·h for billing. Contact ratings: the output relay switches 3 A at 250 V AC or 400 V AC (50/60 Hz), and 1 A at 24 V DC, 0.2 A at 125 V DC, 0.1 A at 250 V DC. The AC-15 switching capacity of 100,000 operations at 230 V AC means it's rated for solenoid loads typical in control circuits — not for direct motor switching. The screw-type terminals accept 2 x 20-14 AWG solid or stranded. Surge voltage withstand of 6 kV per IEC 60947-1 gives it basic impulse immunity for industrial panels without external surge suppression.