Technical Parameters Parameter Description / Value Product Designation Electronic Trip Unit - PR1/P (SACE is the legacy brand name, now under ABB) Compatible Breaker Series ABB SACE Emax E1 series Air Circuit Breakers (e.g., E1B, E1N, E1S, E1H, E1L frames). Trip Unit Power Supply Powered by an external Auxiliary Power Supply Module (e.g., ABB YU-1SDA....) mounted on the breaker, typically 24-48V DC or 110-230V AC/DC. Protection Functions Typically L (Long-time) and I (Instantaneous). May also include S (Short-time) depending on the exact model variant. Does NOT include G (Ground Fault) protection. Adjustable Settings L: Adjustable current threshold (Ir) and time delay (tr). I: Adjustable instantaneous pickup (Ii). S (if present): Adjustable short-time pickup (Isd) and delay (tsd). Measurement Displays phase currents (I1, I2, I3). More advanced measurements (power, energy) require higher-tier PR2 or PR3 units. Display Digital LCD or LED display. Local Interface Keypad for settings and navigation. Communication Often has a slot for optional plug-in communication adapters (e.g., for Modbus, Profibus). Base unit may have a service port. Event Logging Basic trip event indication. Standards IEC 60947-2