Technical Parameters Parameter Category Specification Product Family / Type Self-Powered 3-Phase Voltage Monitor with Motor Start Logic Key Functions 1. Phase Sequence (Rotation) Monitoring 2. Phase Loss (Undervoltage) Detection 3. Voltage Asymmetry (Unbalance) Monitoring 4. Motor Start Supervision (Temporary adaptation of thresholds during start) Standard Compliance IEC/EN 60947-5-1 Power Supply Self-powered from the monitored three-phase line voltage (L1, L2, L3). Rated Operational Voltage (Ue) 3 x 208...480 V AC, 50/60 Hz (Phase-to-Phase). Rated Current Input (In) 1 A AC (For motor start current measurement via external Current Transformers - CTs). Monitoring Parameters & Settings • Voltage Threshold (U<) Adjustable potentiometer. Sets the general minimum voltage level for normal running. • Asymmetry (Unbalance) Threshold Adjustable potentiometer. Sets the maximum permitted voltage imbalance between phases. • Start Mode Logic When motor current is detected (via CTs), the relay automatically switches to a less sensitive "Start Voltage Threshold" for a predefined time, allowing for the expected voltage dip during start-up. • Response Time (Running) Fixed time delay to avoid transients. Output Contact • Type 1 Changeover (CO) contact (SPDT: 13-14 NO, 21-22 NC). • Rated Load 6 A at 250 V AC (AC-15). Binary Inputs • Reset/Start Input (A1/A2) 1 input. A control voltage pulse (24-240V AC/DC, as indicated by suffix -81) must be applied to close the output relay after a fault or initial energization. Indications 2 LEDs: - GREEN (On): Supply healthy, correct sequence, all parameters OK. - RED (Trip): Fault condition (Loss, Unbalance, or Sequence Error). Connection Terminals Screw-clamp terminals for: - 3 Phase Voltages (L1, L2, L3). - 3 Current Inputs (From 1A CTs, connected in Star). - Output Contact (13, 14, 21/22). - Reset Input (A1, A2). Isolation Reinforced insulation between voltage circuits, current circuits, output contact, and reset input. Operating Temperature -25°C to +55°C Storage Temperature -40°C to +85°C Mounting 35mm DIN Rail (EN 60715). Housing & Protection Thermoplastic housing, IP40 (front), IP20 (terminals). Dimensions (W x H x D) Approx. 45 mm x 100 mm x 112 mm (2 module width = 45mm). Note: Width may vary slightly with exact model version. Weight Approx. 0.2 kg.