1SDA055879R1 ABB E2N 1250 PR123/P-LSIG 1250A 3-Pole Withdrawable Air Circuit Breaker Moving Part

Why Choose the ABB 1SDA055879R1 E2N 1250 Air Circuit Breaker?

The ABB 1SDA055879R1 is a high-performance SACE Emax E2N 1250 withdrawable air circuit breaker moving part designed for protection and switching in demanding low-voltage power distribution systems. This three-pole unit combines a 1250 A rated current with ABB's advanced PR123/P-LSIG electronic overcurrent release, providing comprehensive protection for industrial, commercial and infrastructure electrical installations.

As part of the ABB SACE Emax circuit breaker range, the E2N 1250 is engineered for dependable protection of switchboards, distribution networks, transformers and high-current feeders. The PR123/P-LSIG release provides long-time, short-time, instantaneous and earth-fault protection functions, combining advanced electronic protection with measurement and monitoring capabilities for sophisticated low-voltage distribution systems.

This model is supplied as the moving part of a three-pole withdrawable circuit breaker with a rated uninterrupted current of 1250 A and rated operational voltage of 690 V AC. The E2N performance level provides an ultimate short-circuit breaking capacity of 65 kA at 400 V AC and 55 kA at 690 V AC, while its withdrawable construction supports convenient inspection and maintenance within suitable switchgear assemblies.

Key Advantages

• High-capacity 1250 A air circuit breaker moving part for low-voltage power distribution.
• Three-pole configuration designed for three-phase electrical systems.
• Withdrawable (W) construction supports serviceable switchboard installations.
• Advanced PR123/P-LSIG electronic overcurrent release.
• LSIG functionality provides long-time, short-time, instantaneous and earth-fault protection.
• 65 kA ultimate short-circuit breaking capacity at 400 V AC for demanding distribution applications.

Key Features

• ABB SACE Emax E2N 1250 circuit breaker moving part.
• 1250 A rated uninterrupted current.
• Three-pole circuit breaker configuration.
• Withdrawable (W) version.
• PR123/P-LSIG electronic trip unit.
• Long-time overload protection.
• Short-time and instantaneous short-circuit protection.
• Integrated earth-fault protection.
• 690 V AC rated operational voltage.
• Fitted with four auxiliary contacts and circuit-breaker open/closed position indication.

Reliable Protection for High-Current Power Distribution

Air circuit breakers such as the ABB SACE Emax E2N provide switching, isolation and automatic overcurrent protection for high-current low-voltage distribution circuits. The electronic trip unit monitors electrical conditions and initiates breaker operation when configured protection thresholds are exceeded, helping protect switchgear, conductors and connected equipment against damaging overload, short-circuit and earth-fault currents.

The PR123/P-LSIG release gives this E2N 1250 comprehensive long-time, short-time, instantaneous and earth-fault protection for effective coordination within electrical distribution systems. Combined with its 1250 A rating, three-pole arrangement, withdrawable construction and high short-circuit performance, the breaker is well suited to critical industrial and commercial switchboard installations.

Typical Applications

• Industrial low-voltage switchboards and distribution panels.
• Main incoming circuit protection.
• High-current three-phase distribution feeders.
• Transformer secondary circuit protection.
• Manufacturing plants and process facilities.
• Commercial and infrastructure power distribution systems.