Technical Parameters Parameter Category Specification Compatible Breaker Series ABB Emax 2 (E2) Air Circuit Breakers (Fixed & Draw-out versions). Rated Frame Current (In) Matches the breaker frame size. Common frames: E2.1 (1600A), E2.2 (2000A), E2.3 (3200A), E2.4 (4000A), E2.5 (5000A), E2.6 (6300A). The PR122/P is scaled for these ranges. Power Supply Self-powered from the current sensors of the breaker. No external auxiliary power required for basic protection functions. Core Protection Functions (LSI) • Long-time Protection (L) Adjustable Settings: - Ir (Rated Current): 0.4 to 1.0 x In (in steps). - tr (Time Delay): Adjustable, typically following an I²t inverse-time curve. • Short-time Protection (S) Adjustable Settings: - Isd (Short-time Current): 1.5 to 15 x Ir (in steps). - tsd (Short-time Delay): Adjustable in seconds (e.g., 0.05 to 0.5s) or as I²t curve. Can be set to OFF for selectivity. • Instantaneous Protection (I) Adjustable Settings: - Ii (Instantaneous Current): 1.5 to 15 x In, or fixed high value (e.g., 20kA). Can be set to OFF. Ground-Fault Protection (Optional) Available as an add-on module (PR122/P + G). The base LSI version does not include ground-fault protection. Measurement & Display • Display Backlit LCD graphical display on the trip unit. • Measured Values Real-time display of: Phase currents (L1, L2, L3), Neutral current (if sensor present), Ground current, Max current, Power (kW, kVA), Power Factor, Frequency, Energy (kWh), etc. • Metering Accuracy Class 1 per IEC 61557-12. Communication Standard: RS485 port with Modbus RTU protocol. Event Logging Stores time-stamped records of trips, alarms, and breaker operations (Open, Close). Configuration Via front keypad or via ABB Emax Connect PC software through the communication port. Testing Built-in trip test function to verify the health of the trip unit and the breaker's operating mechanism. Ambient Temperature -25°C to +70°C (Operating) Standards IEC 60947-2, UL 489, CSA C22.2 Key Feature Selectivity (Coordination): The adjustable S and I delays allow for precise time-current coordination with downstream breakers, minimizing outage impact during a fault.