Parameters: Model Number: ABB PR121/P-LSI Rated Current (In): Configurable, typically up to 1250 A depending on frame and application Number of Poles: 3P (three-phase) Breaking Capacity (Icu): Up to 65 kA at 415 V AC Rated Voltage: 415 V AC (standard low-voltage systems) Trip Unit Type: LSI (Long-time, Short-time, Instantaneous) Long-time (L): Protects against overloads Short-time (S): Protects against short-duration overcurrents Instantaneous (I): Protects against immediate high short-circuit currents Trip Unit Settings: Adjustable according to load and protection requirements Mounting: Fixed or draw-out type depending on configuration Operating Temperature Range: -25°C to +60°C Mechanical Life: Approx. 10,000 operations Electrical Life: Approx. 5,000 operations at rated current Standards Compliance: IEC 60947-2 / EN 60947-2 Auxiliary Contacts: Optional, for remote signaling and control Shunt Trip / Undervoltage Trip: Optional for remote control and automation Protection Features: Overload protection (thermal) Short-circuit protection (magnetic) Earth fault / ground fault protection Adjustable trip settings for coordinated protection