Parameter Category Specification Assembly Type High-Current LV Switchgear Functional Unit / Incomer Compartment Standard IEC 61439-1 & -2 Internal Separation Special High-Current Form (likely F5S). Expect maximum segregation, with separate compartments for busbars, breaker, and cable terminals for safety and maintenance. Busbar System • Rated Current (Ibm): 4000 A • Short-Time Withstand (Icw): Very high, typically 80 kA to 120 kA for 1s or 3s. • Peak Withstand (Ipk): ~2.2 x Icw (e.g., 176 kA to 264 kA). Main Protective Device • Type: ABB SACE Emax E4 (or large E3) Frame, Draw-out Air Circuit Breaker. • Likely Rated Current (In): 3200A, 4000A, or 5000A (matching the busbar or slightly lower). • Poles: 3 • Trip Unit: Advanced Electronic (e.g., PR122/P or PR123/P) for comprehensive protection and metering. • Breaking Capacity (Icu): Very high, matching the busbar system (e.g., 100 kA, 150 kA at 400V AC). Key Breaker Features • Heavy-Duty Draw-out Truck (W) with advanced interlocks. • High-Torque Electric Charging Motor (M). • Shunt Trip (MX) (P). Typical Additional Breaker Accessories • Full set of Auxiliary Contacts (OF/SD). • Undervoltage Release (MN). • Additional alarm and interlock contacts. • Communication module for integration into monitoring systems. Control Voltage Dedicated auxiliary supply for motor and releases (e.g., 220V DC or 230V AC). Physical Configuration Likely a wide, multi-module compartment. Includes: • Massive busbar system. • Heavy-duty draw-out breaker truck with roller mechanism. • Large cable connection chambers (front/rear). • Robust shutters and arc containment features. IP Rating (Enclosure) Typically IP31 or IP41 for indoor switchrooms.