1SDA056188R1 ABB E3S1250 PR122/P-LSI 1250A 4P Fixed Air Circuit Breaker

Why Choose the ABB E3S1250 PR122/P-LSI 1250A 4P Fixed Air Circuit Breaker?

The ABB 1SDA056188R1 is a high-performance SACE Emax E3S air circuit breaker (ACB) designed for switching and protection in demanding low-voltage electrical distribution systems. Part of the ABB New Emax product group, this four-pole fixed circuit breaker combines a 1250 A rated current with the advanced PR122/P-LSI R1250 electronic overcurrent release for dependable protection of industrial, commercial and infrastructure power networks.

The E3S1250 provides long-time, short-time and instantaneous protection through its LSI trip functionality. The PR122/P electronic release protects against overload, delayed short-circuit and instantaneous short-circuit conditions while providing the enhanced measurement, signalling and accessory capabilities associated with ABB's PR122/P platform. This LSI configuration does not include integrated earth-fault protection.

The E3S performance level is designed for applications requiring high short-circuit performance within the SACE Emax range. This version features a four-pole fixed configuration with rear horizontal terminals, a PR122/P-LSI R1250 release, four auxiliary contacts and circuit-breaker open/closed position indication for permanent integration into low-voltage switchgear.

Key Advantages

• High-performance ABB SACE Emax E3S air circuit breaker for demanding low-voltage power distribution.
• 1250 A rated current for industrial, commercial and infrastructure electrical systems.
• Four-pole fixed configuration suitable for three-phase systems requiring neutral switching.
• PR122/P-LSI R1250 electronic overcurrent release for comprehensive overload and short-circuit protection.
• LSI functionality provides long-time, short-time and instantaneous protection.
• Advanced PR122/P platform supports enhanced protection adjustment, measurement and signalling capabilities.
• Rear horizontal terminals provide a practical connection arrangement for fixed switchboard installations.
• Four auxiliary contacts and open/closed position indication support switchgear control and status monitoring.

Key Features

• ABB SACE Emax E3S1250 air circuit breaker.
• 1250 A rated current.
• Four-pole construction.
• Fixed circuit-breaker configuration.
• PR122/P-LSI R1250 electronic overcurrent release.
• Long-time, short-time and instantaneous (LSI) protection functions.
• No integrated earth-fault protection in this LSI configuration.
• Rear horizontal (HR) terminals.
• Four auxiliary contacts.
• Circuit-breaker open/closed position indication.
• E3 frame with S short-circuit performance level.
• Designed for fixed installation in low-voltage switchgear and power distribution assemblies.

Reliable High-Performance Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB SACE Emax E3S1250 provide switching, isolation and electronic overcurrent protection at critical points within low-voltage distribution systems. The E3 frame combines substantial current-carrying capability with the S performance level, making it suitable for switchboards and distribution networks where higher prospective short-circuit currents require robust interruption capability.

The PR122/P-LSI electronic trip unit provides long-time overload, short-time delayed overcurrent and instantaneous short-circuit protection. Combined with the fixed Emax construction and high short-circuit performance of the E3S platform, this configuration provides dependable protection and flexible electronic adjustment for industrial, commercial and infrastructure power distribution applications.

Typical Applications

• Main incoming circuit breakers in low-voltage switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical installations.
• Manufacturing and process plants.
• Transformer-fed distribution systems.
• Generator distribution and protection systems.
• Distribution feeder protection.
• Four-pole systems requiring neutral switching.
• Fixed low-voltage switchgear and power distribution assemblies.