1SDA055659R1 ABB E1B 1250 PR122/P-LI 1250A 4-Pole Withdrawable Air Circuit Breaker

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

The ABB E1B 1250 PR122/P-LI, order code 1SDA055659R1, is a 1250 A four-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 E1B circuit-breaking performance with a PR122/P-LI R1250 electronic overcurrent release.

The fitted PR122/P-LI R1250 trip unit provides long-time overload and instantaneous short-circuit protection. Its overload release can be adjusted across a 500–1250 A range, while instantaneous short-circuit protection provides rapid interruption of severe fault currents. This LI configuration is suited to applications where short-time delayed and integrated earth-fault protection are not required.

Supplied as a withdrawable moving part, the breaker connects through the appropriate separate SACE Emax fixed part or cradle, supporting convenient isolation, servicing and replacement. The four-pole arrangement is suitable for three-phase systems requiring neutral switching, 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 moving part for low-voltage distribution.
• Four-pole configuration suitable for three-phase systems requiring neutral switching.
• PR122/P-LI R1250 electronic trip unit provides dependable electronic overcurrent protection.
• LI protection functions provide long-time overload and instantaneous short-circuit protection.
• 42 kA short-circuit breaking capacity at 400 V AC, 50 Hz.
• Withdrawable construction facilitates isolation, inspection, maintenance and replacement.
• Four auxiliary contacts provide circuit-breaker status signalling.
• Open/closed position indication supports switchboard monitoring and control.

Key Features

• ABB SACE Emax E1B series.
• 1250 A rated uninterrupted current.
• Four-pole configuration.
• PR122/P-LI R1250 electronic overcurrent release.
• Long-time (L) overload protection.
• Instantaneous (I) short-circuit protection.
• 500–1250 A overload release adjustment range.
• 1875–18,750 A instantaneous short-circuit adjustment range.
• 690 V rated voltage.
• 42 kA short-circuit breaking capacity at 400 V AC, 50 Hz.
• Withdrawable moving-part construction.
• Four auxiliary contacts configured as 2 NO + 2 NC.
• Trip indication provided.
• IP2X degree of protection.

Electronic LI Protection for High-Current 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. This E1B 1250 combines a continuous current capability of 1250 A with a 42 kA short-circuit breaking capacity at 400 V AC, making it suitable for demanding main distribution and feeder duties.

The PR122/P-LI electronic release combines adjustable long-time overload protection with instantaneous short-circuit protection. Together with the withdrawable moving-part design, this provides a practical solution for installations requiring high-current circuit protection and convenient breaker isolation for inspection, maintenance or replacement.

Typical Applications

• Industrial low-voltage distribution switchboards.
• Main incoming and feeder circuit protection.
• Three-phase four-wire distribution systems.
• Manufacturing plants and production facilities.
• Commercial and infrastructure electrical distribution systems.
• Motor control centres and industrial power systems.
• Generator and transformer distribution installations.
• Switchboards requiring withdrawable four-pole circuit breakers.