1SDA055864R1 ABB E2N1250 PR121/P-LI 1250A 4-Pole Fixed Air Circuit Breaker

Why Choose the ABB E2N1250 PR121/P-LI 1250A 4-Pole Fixed Air Circuit Breaker?

The ABB 1SDA055864R1 is a high-performance SACE Emax E2N air circuit breaker (ACB) designed for switching and protection in demanding low-voltage electrical distribution systems. Rated at 1250 A, this four-pole fixed circuit breaker is equipped with the PR121/P-LI R1250 electronic overcurrent release for reliable overload and instantaneous short-circuit protection.

As part of the ABB SACE Emax / New Emax range, the E2N1250 combines high short-circuit performance with electronic circuit protection for industrial and commercial power distribution. The PR121/P-LI release provides long-time and instantaneous protection functions, helping protect cables, busbars and connected electrical equipment against sustained overloads and severe short-circuit currents.

The E2N1250 PR121/P-LI is a four-pole fixed circuit breaker with rear horizontal terminals, a rated uninterrupted current of 1250 A and a rated voltage of 690 V AC. Its N performance level provides a rated ultimate short-circuit breaking capacity of 65 kA at 400–440 V AC and 55 kA at 500–690 V AC, making it suitable for demanding three-phase four-wire distribution systems with elevated prospective fault currents.

Key Advantages

• High-performance 1250 A SACE Emax air circuit breaker.
• Four-pole configuration suitable for three-phase four-wire electrical distribution systems.
• Electronic PR121/P-LI R1250 overcurrent release.
• LI protection provides long-time overload and instantaneous short-circuit protection.
• 65 kA ultimate short-circuit breaking capacity at 400–440 V AC.
• Adjustable overload protection from 500–1250 A.
• Fixed construction with rear horizontal terminals for switchboard integration.
• Four auxiliary change-over contacts with circuit-breaker open/closed position indication.

Key Features

• ABB SACE Emax E2N1250 air circuit breaker.
• 1250 A rated uninterrupted current.
• Four-pole configuration.
• Fixed circuit-breaker construction.
• Rear flat horizontal terminals.
• PR121/P-LI R1250 electronic overcurrent release.
• Long-time and instantaneous LI protection functions.
• 690 V AC rated voltage.
• 65 kA Icu at 400 V AC, 50 Hz.
• 55 kA Icu at 690 V AC.
• Adjustable instantaneous short-circuit protection from 1875–18750 A.
• Optional motor operating mechanism for electrically operated applications.

Reliable Circuit Protection for High-Fault-Level Four-Wire Distribution

Air circuit breakers such as the ABB E2N1250 provide switching, isolation and protection for high-current low-voltage distribution circuits. The four-pole configuration is particularly suitable for three-phase four-wire systems where switching of the neutral conductor is required alongside the three phase conductors, while the N performance level provides increased short-circuit interruption capability for installations with elevated prospective fault currents.

The PR121/P-LI electronic release provides long-time protection against sustained overload conditions and instantaneous protection against severe short-circuit currents. Adjustable protection settings allow the E2N1250 to be coordinated with other protective devices throughout industrial and commercial electrical distribution systems.

Typical Applications

• Industrial low-voltage switchboards and distribution panels.
• Three-phase four-wire electrical distribution systems.
• Main incoming circuit protection.
• High-fault-level feeder protection.
• Busbar and power distribution applications.
• Transformer secondary distribution systems.
• Manufacturing and process plants.
• Commercial and infrastructure installations requiring high short-circuit interruption capability.