1SDA055956R1 ABB E2S1250 PR122/P-LSI 1250A 3-Pole Fixed Air Circuit Breaker

Why Choose the ABB E2S1250 PR122/P-LSI 1250A Air Circuit Breaker?

The ABB E2S1250 PR122/P-LSI, order code 1SDA055956R1, is a high-performance three-pole fixed air circuit breaker (ACB) designed for switching and protection in demanding low-voltage electrical distribution systems. Part of the established ABB SACE Emax series, this E2S circuit breaker combines a rated current of 1250 A with the PR122/P electronic overcurrent release for dependable protection in industrial, commercial and infrastructure power networks.

This configuration is supplied as a fixed three-pole circuit breaker with horizontal rear terminals, providing a practical connection arrangement for integration into low-voltage switchboards. The fitted PR122/P-LSI R1250 electronic overcurrent release provides long-time, short-time and instantaneous protection functions, helping protect electrical systems against sustained overloads and short-circuit faults while supporting selective protection coordination.

The E2S performance level provides a rated ultimate short-circuit breaking capacity of 85 kA at 400 V AC, making this breaker suitable for installations with high prospective fault currents. Four change-over auxiliary contacts and open/closed circuit-breaker position indication support remote status signalling, monitoring and integration with switchboard control systems.

Key Advantages

• High-performance ABB SACE Emax E2S air circuit breaker for low-voltage power distribution.
• 1250 A rated current for demanding industrial and commercial distribution applications.
• Three-pole fixed configuration for three-phase electrical systems.
• PR122/P-LSI electronic overcurrent release for accurate and configurable circuit protection.
• Long-time, short-time and instantaneous protection against overload and short-circuit conditions.
• 85 kA rated ultimate short-circuit breaking capacity at 400 V AC for high fault-level applications.
• Horizontal rear terminals for convenient switchboard connection.
• Four change-over auxiliary contacts plus open/closed indication for status monitoring and control integration.

Key Features

• ABB SACE Emax E2S series.
• 1250 A rated uninterrupted current.
• Three-pole construction.
• Fixed installation version.
• Horizontal rear terminals (HR).
• PR122/P electronic overcurrent release.
• R1250 release rating.
• LSI protection: long-time, short-time and instantaneous.
• 690 V AC rated voltage.
• 85 kA ultimate short-circuit breaking capacity at 400 V AC.
• Four change-over auxiliary contacts.
• Open/closed circuit-breaker position indication.

Advanced Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB SACE Emax E2S1250 provide switching, isolation and protection for high-current low-voltage distribution circuits. The E2S performance class offers strong short-circuit interruption capability, making this breaker well suited to main distribution boards, incomers, feeders and other critical positions where high prospective fault currents may be present.

The PR122/P electronic overcurrent release provides LSI protection for demanding electrical networks. Long-time protection responds to sustained overload conditions, short-time protection enables controlled response and coordination during short-circuit events, and instantaneous protection provides rapid interruption of severe fault currents to help safeguard conductors, switchgear and connected electrical equipment.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Main incomer and feeder circuit protection.
• Manufacturing and process plants.
• Commercial buildings and infrastructure installations.
• Motor control centres and power distribution assemblies.
• Transformer secondary distribution circuits.
• High fault-level low-voltage switchgear systems.