1SDA055979R1 ABB E2S1250 PR122/P-LI 1250 A 4P Withdrawable Air Circuit Breaker Moving Part

Why Choose the ABB E2S1250 PR122/P-LI Air Circuit Breaker Moving Part?

The ABB E2S1250 PR122/P-LI, order code 1SDA055979R1, is a high-performance four-pole withdrawable air circuit breaker moving part designed for protection and switching in low-voltage power distribution systems. As part of the ABB SACE Emax E2 series, it combines a rated current of 1250 A with the advanced PR122/P-LI electronic trip unit for dependable overload and instantaneous short-circuit protection.

The PR122/P electronic release is designed for precise monitoring and protection of electrical distribution networks. In this LI configuration, it provides long-time overload protection and instantaneous short-circuit protection, helping safeguard conductors, switchgear and connected equipment while providing the flexibility expected from ABB's Emax electronic protection platform.

This version is supplied as the moving portion of a withdrawable E2S1250 circuit breaker and is intended for use with the corresponding fixed part. Its four-pole construction, 1250 A current rating and E2S short-circuit performance make it suitable for demanding industrial, commercial and infrastructure switchboards.

Key Advantages

• High-performance ABB SACE Emax E2S air circuit breaker moving part.
• 1250 A rated current for high-current low-voltage distribution.
• Four-pole configuration for comprehensive switching and isolation.
• Advanced PR122/P-LI electronic trip unit.
• Long-time and instantaneous protection against overload and short-circuit conditions.
• Withdrawable construction supports convenient isolation, servicing and switchgear maintenance.
• 85 kA ultimate short-circuit breaking capacity at 400/415 V AC.
• Designed for integration into ABB Emax withdrawable switchgear assemblies.

Key Features

• ABB SACE Emax E2S series.
• 1250 A rated current.
• Four-pole withdrawable moving part.
• PR122/P-LI electronic overcurrent release.
• LI protection functions: Long-time and Instantaneous.
• Rated operational voltage up to 690 V AC.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• E2S high short-circuit performance level.
• Electronic protection technology for accurate current monitoring and circuit protection.

Reliable Electronic Protection for Power Distribution

Air circuit breakers such as the ABB SACE Emax E2S1250 provide high-current switching, isolation and fault protection in low-voltage distribution systems. Their robust construction and high short-circuit performance make them suitable for main switchboards and other installations where reliable interruption of substantial fault currents is essential.

The PR122/P-LI electronic trip unit provides long-time protection against sustained overload conditions together with instantaneous protection against severe short circuits. The withdrawable construction also enables the circuit breaker moving part to be isolated from the main circuit for inspection and maintenance when installed with the appropriate fixed part.

Typical Applications

• Main low-voltage electrical distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plant switchgear.
• Commercial and infrastructure electrical systems.
• Transformer and generator distribution systems.
• High-current incoming and feeder protection.
• Withdrawable switchgear requiring electronic LI protection.