1SDA056379R1 ABB E3H1250PR122/P-LI 1250 A 4-Pole Air Circuit Breaker

Why Choose the ABB E3H1250PR122/P-LI Air Circuit Breaker?

The ABB E3H1250PR122/P-LI is a high-performance four-pole air circuit breaker (ACB) designed for reliable protection, switching and isolation in low-voltage electrical distribution systems. As part of the proven ABB SACE Emax E3H series, this fixed circuit breaker combines a 1250 A rated uninterrupted current with the advanced PR122/P-LI electronic overcurrent release for dependable protection in demanding industrial and commercial installations.

The PR122/P-LI R1250 electronic trip unit provides long-time overload and instantaneous short-circuit protection. Its electronic protection functionality helps safeguard conductors, switchgear and connected equipment against sustained overcurrents and severe short circuits, while the E3H high short-circuit performance level supports installations with substantial prospective fault currents.

The ABB 1SDA056379R1 is supplied as a four-pole fixed E3H 1250 circuit breaker with rear horizontal terminals. With a rated operational voltage of 690 V AC, high short-circuit interruption capability and four auxiliary change-over contacts, it is well suited to main switchboards, industrial distribution systems and other high-current low-voltage installations.

Key Advantages

• High-performance ABB SACE Emax air circuit breaker for low-voltage power distribution.
• 1250 A rated uninterrupted current for high-current electrical systems.
• Four-pole configuration for four-conductor switching and protection.
• PR122/P-LI electronic trip unit provides long-time and instantaneous overcurrent protection.
• 100 kA ultimate breaking capacity at 400 V AC for demanding fault-current conditions.
• Fixed-mounted construction for permanent switchboard installations.
• Rear horizontal terminals support practical integration with switchboard busbar systems.

Key Features

• ABB SACE Emax E3H series.
• 1250 A rated uninterrupted current.
• Four-pole circuit breaker configuration.
• PR122/P-LI R1250 electronic overcurrent release.
• LI protection functions: long-time overload and instantaneous short circuit.
• 690 V AC rated operational voltage.
• 100 kA Icu at 400–500 V AC.
• 85 kA Icu at 660–690 V AC.
• Fixed version with rear horizontal terminals.
• Four auxiliary change-over contacts with open/closed circuit-breaker position indication.

Reliable Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB SACE Emax E3H protect electrical distribution systems against overload and short-circuit conditions while providing dependable switching and isolation. Their high interrupting capability makes them particularly suitable for main distribution points, industrial switchboards and other installations where prospective fault currents can be substantial.

The PR122/P-LI electronic release combines adjustable long-time overload protection with rapid instantaneous protection against severe short circuits. Together with the E3H platform's high breaking capacity, these functions provide dependable protection for important low-voltage distribution equipment and circuits.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical installations.
• Manufacturing plants and process facilities.
• Power distribution centres and electrical substations.
• Generator and transformer distribution systems.
• High-current switchgear and control assemblies.