1SDA055877R1 ABB E2N 1250 PR122/P-LSIG 1250A 3-Pole Withdrawable Air Circuit Breaker Moving Part

Why Choose the ABB 1SDA055877R1 E2N 1250 Air Circuit Breaker?

The ABB 1SDA055877R1 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 PR122/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 PR122/P-LSIG release provides long-time, short-time, instantaneous and earth-fault protection functions, enabling effective response to overloads, short circuits and earth faults while supporting coordinated protection schemes.

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, while the withdrawable construction supports convenient inspection, maintenance and replacement 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 PR122/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.

Key Features

• ABB SACE Emax E2N 1250 circuit breaker moving part.
• 1250 A rated uninterrupted current.
• Three-pole circuit breaker configuration.
• Withdrawable (W) version.
• PR122/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 circuit conditions and initiates breaker operation when configured protection thresholds are exceeded, helping protect switchgear, conductors and connected electrical equipment against damaging overload, short-circuit and earth-fault currents.

The PR122/P-LSIG release gives this E2N 1250 comprehensive long-time, short-time, instantaneous and earth-fault protection capabilities 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 demanding 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.