1SDA055959R1 ABB E2S 1250 PR123/P-LSIG 1250A 3-Pole Fixed Air Circuit Breaker

Why Choose the ABB 1SDA055959R1 E2S 1250 Air Circuit Breaker?

The ABB 1SDA055959R1 is a SACE Emax E2S 1250 air circuit breaker (ACB) designed for dependable switching and comprehensive protection in demanding low-voltage power distribution systems. This three-pole fixed circuit breaker combines a 1250 A rated current with ABB's advanced PR123/P-LSIG electronic overcurrent release, providing sophisticated protection for industrial, commercial and infrastructure electrical installations.

As part of the ABB SACE Emax range, the E2S 1250 provides high short-circuit performance for installations with substantial prospective fault currents. The PR123/P-LSIG release provides long-time, short-time, instantaneous and earth-fault protection functions, while the PR123/P platform also supports advanced measurement and monitoring capabilities for demanding power distribution applications.

This model is supplied in a three-pole fixed configuration with rear horizontal terminals. The E2S performance level provides a rated uninterrupted current of 1250 A, an ultimate short-circuit breaking capacity of 85 kA at 415 V AC and a short-time withstand current of 65 kA for 1 s, making the ABB 1SDA055959R1 well suited to critical high-current switchboard applications.

Key Advantages

• High-performance 1250 A air circuit breaker for demanding low-voltage distribution systems.
• 85 kA ultimate short-circuit breaking capacity at 415 V AC.
• Three-pole fixed construction for permanent switchboard installation.
• Advanced PR123/P-LSIG electronic overcurrent release.
• LSIG functionality provides long-time, short-time, instantaneous and earth-fault protection.
• Rear horizontal terminals support integration into compatible low-voltage switchgear.

Key Features

• ABB SACE Emax E2S 1250 air circuit breaker.
• 1250 A rated uninterrupted current.
• Three-pole circuit breaker configuration.
• Fixed (F) version.
• Rear horizontal terminals.
• PR123/P-LSIG R1250 electronic trip unit.
• Long-time, short-time, instantaneous and earth-fault protection.
• 85 kA ultimate short-circuit breaking capacity at 415 V AC.
• 65 kA short-time withstand current for 1 s.
• Fitted with four auxiliary contacts and open/closed position indication.

Advanced LSIG Protection for High-Performance Power Distribution

Air circuit breakers such as the ABB SACE Emax E2S provide switching, isolation and automatic overcurrent protection for high-current low-voltage distribution circuits. The electronic trip unit monitors electrical conditions and initiates breaker operation when configured protection thresholds are exceeded, helping protect switchgear, conductors and connected equipment against damaging overload, short-circuit and earth-fault currents.

The PR123/P-LSIG release gives this E2S 1250 long-time, short-time, instantaneous and earth-fault protection capabilities together with the advanced functionality of ABB's PR123/P trip-unit platform. Combined with its 1250 A rating, three-pole fixed construction, rear horizontal terminals and high E2S short-circuit performance, the ABB 1SDA055959R1 provides a capable protection solution for demanding low-voltage distribution systems.

Typical Applications

• Industrial low-voltage switchboards and distribution panels.
• Main incoming circuit protection.
• High-current three-phase distribution feeders.
• Transformer secondary circuit protection.
• Manufacturing and process facilities.
• Commercial buildings and infrastructure power distribution.
• Installations with high prospective short-circuit currents.