1SDA055653R1 ABB E1B 1250 PR122/P-LSIG 1250A 3-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB E1B 1250 PR122/P-LSIG 1250A Air Circuit Breaker?

The ABB E1B 1250 PR122/P-LSIG, order code 1SDA055653R1, is a high-performance 1250 A three-pole withdrawable air circuit breaker moving part designed for protection and switching in demanding low-voltage electrical distribution systems. Part of the proven ABB SACE Emax / New Emax range, it combines robust E1B short-circuit performance with a PR122/P-LSIG electronic overcurrent release.

The PR122/P-LSIG R1250 trip unit provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. This comprehensive LSIG protection enables the breaker to respond to multiple fault conditions while supporting selective and coordinated protection within industrial and commercial distribution networks.

Supplied as a withdrawable moving part, the breaker is designed for use with the appropriate SACE Emax fixed part or cradle. Its withdrawable construction facilitates isolation and maintenance, while four auxiliary contacts and open/closed position indication support integration into switchboard control and monitoring systems.

Key Advantages

• High-current 1250 A air circuit breaker for demanding low-voltage distribution systems.
• PR122/P-LSIG R1250 electronic trip unit provides comprehensive electronic protection.
• LSIG protection covers overload, short-time short circuit, instantaneous short circuit and earth faults.
• 42 kA Icu and Ics across the specified 220–690 V AC operating range.
• 42 kA short-time withstand current for 1 s supports demanding distribution applications.
• Withdrawable construction simplifies circuit isolation, inspection and maintenance.
• Four auxiliary contacts support remote circuit-breaker status signalling.
• Open/closed position indication assists switchboard monitoring and control.

Key Features

• ABB SACE Emax E1B series.
• 1250 A rated uninterrupted current.
• Three-pole configuration.
• PR122/P-LSIG R1250 electronic overcurrent release.
• Long-time (L) overload protection.
• Short-time (S) short-circuit protection.
• Instantaneous (I) short-circuit protection.
• Integrated earth-fault (G) protection.
• 690 V AC rated operational voltage.
• 42 kA rated ultimate and service short-circuit breaking capacity.
• 42 kA Icw for 1 s and 36 kA for 3 s.
• Withdrawable moving-part construction.
• Four auxiliary contacts configured as 2 NO + 2 NC.
• Open/closed circuit-breaker position indication.

Comprehensive LSIG Protection for Low-Voltage Distribution

Air circuit breakers such as the ABB SACE Emax E1B protect high-current electrical distribution systems by detecting and interrupting abnormal current conditions before cables, switchgear and connected equipment can be damaged. The E1B 1250 combines a continuous current rating of 1250 A with 42 kA ultimate and service short-circuit breaking capacities across its specified AC voltage range.

The PR122/P-LSIG electronic release combines long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection within one electronic trip unit. Together with the withdrawable moving-part design, this provides a flexible solution for installations requiring comprehensive protection, high fault-handling capability and convenient breaker isolation for servicing.

Typical Applications

• Industrial low-voltage distribution switchboards.
• Main incoming and feeder circuit protection.
• Manufacturing plants and production facilities.
• Commercial and infrastructure electrical distribution systems.
• Motor control centres and industrial power systems.
• Generator and transformer distribution installations.
• High-current three-phase distribution systems.
• Switchboards requiring withdrawable circuit breakers with LSIG protection.