1SDA056442R1 ABB E3H2000PR121/P-LSIG 2000 A 4-Pole Air Circuit Breaker

Why Choose the ABB E3H2000PR121/P-LSIG Air Circuit Breaker?

The ABB E3H2000PR121/P-LSIG is a high-performance four-pole air circuit breaker (ACB) designed for comprehensive protection, switching and isolation in demanding low-voltage electrical distribution systems. Part of the established ABB SACE Emax E3H series, this fixed circuit breaker combines a 2000 A rated uninterrupted current with the PR121/P-LSIG electronic overcurrent release.

The PR121/P-LSIG R2000 electronic trip unit provides long-time overload, short-time delayed short-circuit, instantaneous short-circuit and ground-fault protection. These LSIG functions help protect conductors, switchgear and connected equipment against sustained overloads, severe phase faults and ground-fault conditions while supporting coordinated protection across low-voltage distribution networks.

The ABB 1SDA056442R1 is supplied as a four-pole fixed E3H 2000 circuit breaker with rear horizontal terminals. Its 2000 A current rating, high E3H fault-interruption performance, comprehensive LSIG protection and four auxiliary change-over contacts make it particularly suitable for main switchboards and critical industrial power-distribution applications.

Key Advantages

• High-performance ABB SACE Emax E3H air circuit breaker for demanding low-voltage distribution systems.
• 2000 A rated uninterrupted current for high-current electrical installations.
• Four-pole configuration for four-conductor switching and protection.
• PR121/P-LSIG electronic trip unit provides long-time, short-time, instantaneous and ground-fault protection.
• 100 kA breaking capacity at 400 V AC for installations with high prospective fault currents.
• Fixed construction with rear horizontal terminals for permanent switchboard installations.
• Four auxiliary change-over contacts support circuit-breaker status monitoring and control integration.

Key Features

• ABB SACE Emax E3H series.
• 2000 A rated uninterrupted current.
• Four-pole circuit breaker configuration.
• PR121/P-LSIG R2000 electronic overcurrent release.
• LSIG protection functions: long-time, short-time, instantaneous and ground fault.
• 690 V AC rated operational voltage.
• 100 kA Icu at 400 V AC.
• Fixed execution for permanent switchboard installation.
• Rear horizontal terminals for main-circuit connection.
• Four auxiliary change-over contacts with circuit-breaker open/closed position indication.

Comprehensive LSIG Protection for High-Current Distribution

Air circuit breakers such as the ABB SACE Emax E3H provide switching, isolation and protection for major low-voltage distribution circuits. The E3H platform combines high short-circuit interruption capability with electronic protection, making it suitable for main incomers, bus couplers and other critical circuits where substantial load and fault currents may occur.

The PR121/P-LSIG release adds ground-fault protection to the conventional long-time, short-time and instantaneous functions, providing a comprehensive LSIG protection package. This combination helps protect electrical infrastructure against multiple fault conditions while allowing protection settings to be coordinated with upstream and downstream devices.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power distribution systems.
• Main incomer and bus-coupler applications.
• Commercial and infrastructure electrical installations.
• Manufacturing plants and process facilities.
• Power distribution centres and electrical substations.
• Generator and transformer distribution systems.