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PR121/P，1250A，3P

ABB Emax 2 low-voltage air circuit breaker, configured with a fixed mounting (FIXED), 1250A frame, and equipped with the advanced PR121/P electronic trip unit. This device is designed for main protection and distribution in medium to large-scale electrical installations such as industrial plants, commercial buildings, and infrastructure projects.

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Technical Data: Series & Frame: Emax 2 (E2) - Specifically the E2N frame (optimized design) rated for 1250 A continuous current. Rated Ultimate Breaking Capacity (Icu): 65 kA or 85 kA at 415V AC (Definitive value depends on the specific E2N1250 ordering code – e.g., “R6565” for 65kA, “R8585” for 85kA). Number of Poles: 3 Poles (3P). Trip Unit: PR121/P-LSI - Digital Electronic Trip Unit. Protection Functions (Fully Adjustable): L - Overload Protection: Setting Ir = (0.4 to 1.0) x In. Time delay tr adjustable. S - Short-Time Protection: Setting Isd = (1.5 to 15) x Ir. Time delay tsd adjustable with I²t selectivity curve option. I - Instantaneous Protection: Setting Ii = (1.5 to 15) x In (fixed or adjustable). Measurement Functions: Displays real-time values for current (I), voltage (V), power (kW), energy (kWh), and power factor (cos φ) on its front-panel display. Communication: Not built-in by default. Requires optional communication module (e.g., MODBUS RTU, PROFIBUS DP, Ethernet) to be plugged into the trip unit for integration into supervisory systems. Mounting Type: Fixed (FIXED) - Permanently bolted to the switchboard assembly. (Draw-out version would be specified as “FHR” instead). Operating Mechanism: Stored-energy spring mechanism with manual charging handle. Can be optionally equipped with an electric charging motor. Standards Compliance: IEC/EN 60947-2, UL 1066, CSA C22.2 No. 5.