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PSR25-600-81

The ABB PSR25-600-81 is a compact, three-phase current monitoring relay from ABB's extensive PSR (Protection, Signaling, and Control) range. It is a specialized device designed for reliable monitoring and protection of three-phase systems against common faults such as phase loss (single-phasing), phase sequence reversal, and current asymmetry/unbalance.

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Technical Parameters Parameter Category Specification Product Family / Type Self-Powered Three-Phase Current Monitoring Relay Function Protection against: Phase Loss, Phase Reversal, Current Asymmetry (Unbalance). Standard Compliance IEC 60947-1, IEC 60947-5-1 Power Supply Self-powered from the monitored current transformers (CTs). No external auxiliary voltage required. Rated Current Input (In) 1 A AC (This is defined by the -600- in the type code. 600 = 1A; 500 = 5A). Operating Range 0.1 A to 1.3 A AC. Frequency 50 / 60 Hz. Monitoring Functions & Settings • Phase Loss Detection Detects if any phase current falls below the threshold setting. • Phase Asymmetry (Unbalance) Detects imbalance between phase currents. Adjustable tripping threshold (e.g., 20% to 70% of asymmetry). • Phase Sequence Monitors for correct phase rotation (e.g., L1-L2-L3). Trips on reversal. • Threshold Setting (I<) Adjustable via rotary switch (typically 0.15 - 0.95 x In) to define the minimum current level. • Response Time Fixed, typically around 0.1 to 1 second. Output Contact • Type 1 Changeover (CO) contact (SPDT: 1 NO + 1 NC). • Rated Operational Current (Ie) 6 A AC-15 / 0.5 A DC-13. • Utilization Category AC-15: 230V, 6A; DC-13: 24V, 0.5A. Binary Input 1 Reset/Start Input (Terminal A1). A voltage pulse (24-240V AC/DC) is required to close the output relay after a fault or power-up. Indications 2 LEDs: - Green (On) : Power OK, correct phase sequence, currents above threshold. - Red (Trip) : Fault condition (Phase Loss, Reversal, or Asymmetry). Connection Screw-clamp terminals for: - 3 Phase Current Inputs (L1, L2, L3). - Output Contact (13, 14, 23). - Reset Input (A1, A2). Electrical Life ≥ 100,000 cycles (at rated load). Isolation Reinforced insulation between current circuits, output contact, and reset input. Operating Temperature -25°C to +55°C Storage Temperature -40°C to +85°C Mounting Standard DIN rail (35mm TS35/7.5 or 15mm). Housing Material Self-extinguishing thermoplastic (Polyamide PA 6.6). Protection Rating IP20 (front), IP40 (housed in appropriate enclosure). Dimensions (W x H x D) Approx. 22.5 mm x 100 mm x 112 mm (1 Module width = 22.5mm). Weight Approx. 0.15 kg. Certifications CE, cULus, RoHS.