Technical Parameters: E1 vs. E2 Frames Parameter Category E1 Frame E2 Frame Frame Size Code E1 E2 Rated Ultimate Current (Iu) Up to 1600 A Up to 2000 A (Common) / 2500 A (E2.5 variant) Typical Model Examples E1.1 (800A), E1.2 (1000A), E1.3 (1250A), E1.4 (1600A) E2.1 (1600A), E2.2 (2000A), E2.3 (2500A), E2.4 (3200A), E2.5 (4000A), E2.6 (5000A), E2.7 (6300A) Rated Operational Voltage (Ue) 690 V AC (Both frames) Breaking Capacity (Icu) - Example at 400V AC High (H) Version: 50 kA, Normal (N) Version: 65 kA, High (S) Version: 100 kA (Varies by specific model and trip unit). High (H) Version: 70 kA, Normal (N) Version: 85 kA, High (S) Version: 100-150 kA (Varies, E2 frames offer higher ratings). Trip Units (Common Types) Electronic: PR121, PR122, PR123. Thermal-Magnetic: TMD, TMA, MIC2.0, MIC5.0, MIC6.0 (Deprecated). Operating Mechanism Spring-operated stored energy mechanism. Manual or electrical charging. Manual or electrical closing/opening. Mounting Style Fixed (Standard) or Draw-out (Plug-in) versions available. Draw-out versions allow easy maintenance and testing without disconnecting power cables. Poles 3-Pole or 4-Pole versions available. Communication Via electronic trip units (e.g., PR122/P) with optional communication modules (e.g., Ekip Com) for Modbus, Profibus, Ethernet/IP, etc. Key Physical Difference Smaller physical size, lighter weight, designed for lower current applications. Larger physical size, more robust construction to handle higher currents and forces. Typical Application • Main incomer for medium-sized transformers (e.g., 1000-1250 kVA). • Large feeder protection. • Large motor protection. • Main incomer for large transformers (e.g., 1500-2500 kVA). • Bus-tie breaker in large switchboards. • Generator main breaker. • Protection of very high power loads. Approx. Dimensions (W x H x D) for 3P Fixed ~ 260mm x 400mm x 300mm (Varies by model) ~ 300-400mm x 500-600mm x 350-450mm (Larger for higher current variants) Approx. Weight for 3P Fixed ~ 45 - 70 kg ~ 80 - 150 kg