1SDA056391R1 ABB E3H1250 PR123/P-LSIG 1250 A 3-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB 1SDA056391R1 E3H1250 Air Circuit Breaker?

The ABB 1SDA056391R1 is a high-performance SACE Emax E3H air circuit breaker (ACB) moving part designed for protection and switching in demanding low-voltage electrical distribution systems. As part of the ABB New Emax E3 series, this three-pole withdrawable circuit breaker combines a 1250 A rated current with the advanced PR123/P-LSIG electronic overcurrent release for comprehensive protection of industrial, commercial and infrastructure power installations.

The E3H1250 is equipped with ABB's PR123/P-LSIG R1250 electronic trip unit, providing long-time, short-time, instantaneous and ground-fault protection. This LSIG configuration provides comprehensive electronic protection against overloads, short circuits and earth faults, making the breaker particularly suitable for critical distribution systems requiring advanced protection and selective fault management.

With a 1250 A rated uninterrupted current, three-pole withdrawable moving-part construction and an ultimate short-circuit breaking capacity of 100 kA at 415 V AC, the 1SDA056391R1 is engineered for switchboards with substantial prospective fault currents. Its withdrawable configuration allows the moving part to be removed from the corresponding fixed cradle for inspection, servicing or replacement.

Key Advantages

• High-performance ABB SACE Emax E3H air circuit breaker moving part for demanding low-voltage distribution.
• 1250 A rated uninterrupted current for high-current industrial, commercial and infrastructure applications.
• PR123/P-LSIG electronic overcurrent release for advanced circuit protection.
• LSIG functionality provides long-time, short-time, instantaneous and ground-fault protection.
• Ultimate short-circuit breaking capacity of 100 kA at 415 V AC for high-fault-level installations.
• Withdrawable moving-part design supports convenient inspection, servicing and replacement.
• E3H high short-circuit performance class supports demanding main distribution applications.
• Four auxiliary contacts with open/closed position indication support circuit-breaker monitoring and control.

Key Features

• ABB SACE Emax E3H1250 series air circuit breaker.
• 1250 A rated uninterrupted current.
• Three-pole configuration.
• Withdrawable moving-part version.
• PR123/P-LSIG R1250 electronic overcurrent release.
• LSIG protection covering long-time, short-time, instantaneous and ground-fault protection.
• Rated operational voltage up to 690 V AC.
• Ultimate short-circuit breaking capacity of 100 kA at 415 V AC.
• Ultimate short-circuit breaking capacity of 85 kA at 660–690 V AC.
• Rated short-time withstand current of 75 kA for 1 s.
• Four auxiliary contacts for circuit-breaker status signalling.
• Circuit-breaker open/closed position indication.

Advanced Protection for High-Current Power Distribution

Air circuit breakers such as the ABB E3H1250 provide switching and protection for high-current low-voltage distribution systems. By detecting overload, short-circuit and ground-fault conditions, the electronic protection system enables the breaker to interrupt potentially damaging fault currents and helps protect busbars, cables, transformers and connected electrical equipment.

The integrated PR123/P-LSIG electronic trip unit provides long-time, short-time, instantaneous and ground-fault protection for comprehensive fault management. Combined with the E3H breaker's 1250 A current rating, 100 kA short-circuit performance at 415 V AC and withdrawable construction, the 1SDA056391R1 is particularly suited to main distribution circuits requiring sophisticated protection, high fault-clearing capability and maintainable switchgear.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plants.
• Commercial and large-building electrical distribution.
• Main incomer and high-current feeder protection.
• Generator and transformer distribution circuits.
• Installations requiring ground-fault protection.
• Power control centres and withdrawable switchgear assemblies.
• Infrastructure and utility installations with high prospective fault currents.