1SDA056122R1 ABB E3N2500 PR121/P-LSIG 2500A 4-Pole Fixed Air Circuit Breaker

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

The ABB E3N2500 PR121/P-LSIG, order code 1SDA056122R1, is a high-performance SACE Emax air circuit breaker (ACB) designed for switching and protection in high-current low-voltage electrical distribution systems. As part of the ABB SACE Emax E3 series, this four-pole fixed circuit breaker combines a 2500 A rated uninterrupted current with the PR121/P-LSIG electronic overcurrent release for comprehensive circuit protection.

The PR121/P-LSIG protection release provides long-time overload, short-time short-circuit, instantaneous short-circuit and ground-fault protection. This LSIG configuration provides comprehensive protection for demanding electrical distribution applications and helps protect switchgear, conductors and connected equipment against overload, short-circuit and earth-fault conditions.

With a 2500 A rated current, four-pole configuration and fixed construction with rear horizontal terminals, the E3N2500 is suitable for main distribution boards, industrial switchgear and other high-current installations. The E3N performance level provides a rated ultimate short-circuit breaking capacity of 65 kA at 415 V AC, together with a 65 kA 1-second short-time withstand current.

Key Advantages

• High-performance ABB SACE Emax air circuit breaker for low-voltage power distribution.
• 2500 A rated uninterrupted current for demanding high-current installations.
• Four-pole configuration for three-phase systems requiring neutral switching.
• PR121/P electronic trip unit with comprehensive LSIG protection.
• 65 kA breaking capacity at 415 V AC for robust short-circuit protection.
• Fixed installation with rear horizontal terminals for switchboard integration.
• Four auxiliary contacts support circuit-breaker status indication and control systems.

Key Features

• ABB SACE Emax E3N2500 air circuit breaker.
• 2500 A rated uninterrupted current.
• Four-pole (4P) configuration.
• PR121/P-LSIG electronic overcurrent release.
• Long-time overload protection (L).
• Short-time short-circuit protection (S).
• Instantaneous short-circuit protection (I).
• Ground-fault protection (G).
• Fixed (F) installation.
• Rear horizontal (HR) terminals.
• 65 kA rated ultimate short-circuit breaking capacity at 415 V AC.
• 65 kA rated short-time withstand current for 1 second.
• Fitted with four auxiliary contacts and open/closed circuit-breaker position indication.

Reliable Circuit Protection for High-Current Power Distribution

Air circuit breakers such as the ABB SACE Emax E3N2500 provide switching, isolation and overcurrent protection for high-current low-voltage distribution circuits. The electronic trip unit monitors current conditions and initiates circuit-breaker operation when configured protection thresholds are exceeded, helping protect cables, switchgear and connected electrical equipment.

The PR121/P-LSIG release gives the E3N2500 multiple levels of protection for effective coordination within electrical distribution systems. Long-time protection responds to sustained overloads, short-time and instantaneous functions provide protection against short circuits, and the ground-fault function provides additional protection against earth-fault conditions.

Typical Applications

• Main low-voltage electrical distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical installations.
• Manufacturing and process facilities.
• High-current incomer and feeder protection.
• Transformer and generator distribution systems.