1SDA056178R1 ABB E3S1250 PR121/P-LSIG 1250 A 3-Pole Air Circuit Breaker

Why Choose the ABB 1SDA056178R1 E3S1250 Air Circuit Breaker?

The ABB 1SDA056178R1 is a high-performance SACE Emax E3S air circuit breaker (ACB) designed for protection and switching in low-voltage electrical distribution systems. As part of the ABB New Emax E3 series, this three-pole fixed circuit breaker combines a 1250 A rated current with the PR121/P-LSIG electronic overcurrent release for dependable protection of industrial and commercial power installations.

The E3S1250 is equipped with ABB's PR121/P-LSIG electronic trip unit, providing long-time, short-time, instantaneous and ground-fault protection. This comprehensive LSIG protection configuration helps protect electrical installations against overloads, short circuits and earth faults while supporting selective coordination within complex low-voltage distribution networks.

With a rated current of 1250 A, a three-pole fixed configuration and horizontal rear terminals, the 1SDA056178R1 is designed for installation within switchboards and power distribution assemblies. The E3S performance level provides a rated ultimate short-circuit breaking capacity of 75 kA at 415 V AC, making the breaker suitable for demanding installations with high prospective fault currents.

Key Advantages

• High-performance ABB SACE Emax air circuit breaker for low-voltage distribution.
• 1250 A rated current for high-current industrial and commercial applications.
• PR121/P-LSIG electronic overcurrent release for comprehensive circuit protection.
• LSIG functionality provides long-time, short-time, instantaneous and ground-fault protection.
• 75 kA breaking capacity at 415 V AC for demanding power distribution systems.
• Three-pole fixed construction simplifies integration into switchboards and distribution panels.
• Horizontal rear terminals provide practical busbar and conductor connection within switchgear.
• Four auxiliary contacts and circuit-breaker open/closed position indication are fitted.

Key Features

• ABB SACE Emax E3S series air circuit breaker.
• 1250 A rated current.
• Three-pole configuration.
• Fixed circuit-breaker version.
• PR121/P-LSIG electronic overcurrent release.
• LSIG protection covering long-time, short-time, instantaneous and ground-fault protection.
• Rated operational voltage up to 690 V AC.
• 75 kA ultimate and service short-circuit breaking capacity at 415 V AC.
• 75 kA for 1 s rated short-time withstand current.
• Horizontal rear terminals for main circuit connections.
• Four auxiliary contacts with circuit-breaker open/closed position indication.
• Robust construction with 20,000-cycle mechanical durability.

Reliable Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB E3S1250 protect high-current electrical distribution systems against overload, short-circuit and ground-fault conditions while also providing controlled switching and isolation. The E3S breaker's high short-circuit performance makes it particularly suitable for main and feeder circuits where substantial prospective fault currents may occur.

The integrated PR121/P-LSIG trip unit provides electronic long-time, short-time, instantaneous and ground-fault protection, enabling the breaker to respond appropriately to multiple types of electrical fault. Combined with the proven SACE Emax platform, this makes the 1SDA056178R1 suitable for switchboards, industrial plants, infrastructure and other critical low-voltage distribution applications.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plants.
• Commercial building electrical distribution.
• Generator and transformer distribution circuits.
• High-current feeder protection.
• Installations requiring ground-fault protection.
• Infrastructure and utility installations.
• Power control centres and switchgear assemblies.