1SDA056121R1 ABB E3N2500 PR121/P-LSI 2500A 4P Fixed Air Circuit Breaker

Why Choose the ABB E3N2500 PR121/P-LSI 2500A 4P Fixed Air Circuit Breaker?

The ABB 1SDA056121R1 is a high-performance SACE Emax E3N air circuit breaker (ACB) designed for switching and protection in demanding low-voltage electrical distribution systems. Part of the ABB New Emax product group, this four-pole fixed circuit breaker combines a 2500 A rated uninterrupted current with the PR121/P-LSI electronic overcurrent release for dependable protection of industrial, commercial and infrastructure power networks.

The E3N2500 provides long-time, short-time and instantaneous protection through its LSI trip functionality. The PR121/P electronic release provides overload, delayed short-circuit and instantaneous short-circuit protection, supporting effective coordination and selectivity between protective devices throughout high-current low-voltage distribution systems.

With a rated uninterrupted current of 2500 A, a 690 V AC rated operational voltage and an ultimate short-circuit breaking capacity of 65 kA at 415 V AC, the E3N2500 provides robust fault protection for main incomers, distribution feeders and large switchboards. This version features a four-pole fixed configuration with rear horizontal terminals for permanent integration into low-voltage switchgear.

Key Advantages

• High-performance ABB SACE Emax E3N air circuit breaker for high-current low-voltage distribution.
• 2500 A rated uninterrupted current for demanding electrical installations.
• Four-pole fixed configuration suitable for three-phase systems requiring neutral switching.
• PR121/P-LSI electronic overcurrent release for comprehensive overload and short-circuit protection.
• LSI functionality provides long-time, short-time and instantaneous protection.
• 65 kA Icu and Ics across the specified 220–690 V AC operating range.
• 65 kA short-time withstand current for 1 s and 3 s supports robust system coordination.
• Rear horizontal terminals provide a practical connection arrangement for fixed switchboard installations.

Key Features

• ABB SACE Emax E3N2500 air circuit breaker.
• 2500 A rated uninterrupted current.
• Four-pole construction.
• Fixed circuit-breaker configuration.
• PR121/P-LSI electronic overcurrent release.
• Long-time, short-time and instantaneous (LSI) protection functions.
• 690 V AC rated operational voltage.
• 65 kA Icu at 220–690 V AC.
• 65 kA Ics at 220–690 V AC.
• 65 kA Icw for 1 s and 3 s.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• Rear horizontal terminals.
• Four auxiliary contacts with circuit-breaker open/closed position indication.

Reliable High-Current Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB SACE Emax E3N2500 provide switching, isolation and overcurrent protection at critical points within high-current low-voltage distribution systems. The E3 frame accommodates substantial continuous currents, while the N performance level provides dependable short-circuit interruption and short-time withstand capability for industrial switchboards, transformer-fed networks and other high-capacity distribution applications.

The PR121/P-LSI electronic trip unit provides long-time overload, short-time overcurrent and instantaneous short-circuit protection. Combined with the E3N breaker platform and 65 kA short-circuit performance, these functions provide a robust protection solution for electrical systems where high continuous-current capacity, selectivity and dependable fault interruption are required.

Typical Applications

• Main incoming circuit breakers in low-voltage switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical installations.
• Manufacturing and process plants.
• Transformer-fed distribution systems.
• Generator distribution and protection systems.
• High-current distribution feeder protection.
• Four-pole distribution systems requiring neutral switching.
• Fixed low-voltage switchgear and power distribution assemblies.