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E1B 1250PR121/LSI 3P FHR NST

The ABB E1B 1250 PR121/LSI 3P FHR NST is a fully specified, fixed-mounted, low-voltage air circuit breaker (ACB) from the ABB SACE Emax series. This comprehensive order code defines every major aspect of the breaker: its frame size, current rating, protection functions, number of poles, breaking capacity, internal accessories, and external terminals.

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Technical Profile Parameter Category Specification Series / Frame ABB SACE Emax, E1B Frame Rated Operational Current (In) 1250 A Rated Operational Voltage (Ue) 690 V AC Rated Insulation Voltage (Ui) 1000 V AC Poles 3 Breaking Capacity (Icu at 400V AC) 50 kA (F version) Mounting Fixed Trip Unit PR121 Electronic Trip Unit Protection Functions LSI • L (Ir): 0.4 - 1.0 x In (500A - 1250A) adjustable. • S (Isd): 1.5 - 10 x Ir adjustable. Time delay adjustable. • I (Ii): 2 - 14 x In adjustable or OFF. Standard Included Accessories • Shunt Trip (MX) for remote opening. • Auxiliary Contacts (OF/SD) 2NO+2NC for status. • Undervoltage Release (MN) for loss-of-voltage tripping. Termination Front Terminals for power connection. Operation Spring-operated stored energy mechanism. Manual or electrical charging. Manual or electrical closing. Communication (Optional) The PR121 trip unit can be equipped with an optional communication module (Ekip Com) for Modbus, Profibus, etc. Standards IEC 60947-2, UL 489