1SDA056274R1 ABB E3S2500 PR121/P-LSIG 2500 A 3-Pole Air Circuit Breaker

Why Choose the ABB 1SDA056274R1 E3S2500 Air Circuit Breaker?

The ABB 1SDA056274R1 is a high-performance SACE Emax E3S air circuit breaker (ACB) designed for protection and switching in demanding low-voltage electrical distribution systems. As part of the ABB New Emax E3 series, this three-pole fixed circuit breaker combines a 2500 A rated current with the PR121/P-LSIG electronic overcurrent release for comprehensive protection of industrial, commercial and infrastructure power installations.

The E3S2500 is equipped with ABB's PR121/P-LSIG electronic trip unit, providing long-time, short-time, instantaneous and ground-fault protection. This LSIG configuration enables effective protection against overloads, short circuits and earth faults while supporting selective coordination within complex low-voltage distribution networks.

With a rated current of 2500 A, a three-pole fixed configuration and horizontal rear terminals, the 1SDA056274R1 is engineered for integration into high-current switchboards and power distribution assemblies. The E3S performance level provides a rated ultimate short-circuit breaking capacity of 75 kA at 400–415 V AC, making it suitable for installations with substantial prospective fault currents.

Key Advantages

• High-performance ABB SACE Emax air circuit breaker for low-voltage power distribution.
• 2500 A rated current for high-current industrial and commercial applications.
• PR121/P-LSIG electronic overcurrent release for comprehensive circuit protection.
• LSIG functionality provides long-time, short-time, instantaneous and ground-fault protection.
• 75 kA short-circuit breaking capacity at 400–415 V AC for demanding distribution systems.
• Three-pole fixed construction simplifies integration into switchboards and power distribution assemblies.
• Horizontal rear terminals provide practical busbar and conductor connection within switchgear.
• Four auxiliary contacts and circuit-breaker open/closed position indication support system monitoring.

Key Features

• ABB SACE Emax E3S2500 series air circuit breaker.
• 2500 A rated current.
• Three-pole configuration.
• Fixed circuit-breaker version.
• PR121/P-LSIG electronic overcurrent release.
• LSIG protection covering long-time, short-time, instantaneous and ground-fault protection.
• Rated operational voltage of 690 V AC.
• Rated insulation voltage of 1000 V.
• Rated impulse withstand voltage of 12 kV.
• 75 kA rated ultimate and service short-circuit breaking capacity at 400–415 V AC.
• 75 kA for 1 s rated short-time withstand current.
• Horizontal rear terminals for main circuit connections.

Reliable Protection for High-Current Power Distribution

Air circuit breakers such as the ABB E3S2500 provide switching, isolation and protection for high-current low-voltage distribution systems. By detecting overload, short-circuit and ground-fault conditions, the breaker can interrupt potentially damaging fault currents and help protect electrical infrastructure, connected equipment, busbars and distribution conductors.

The integrated PR121/P-LSIG electronic trip unit provides long-time, short-time, instantaneous and ground-fault protection. Combined with the E3S breaker's 75 kA short-circuit performance and 2500 A current rating, this makes the 1SDA056274R1 particularly suitable for main incomers, high-current feeders and critical distribution circuits requiring comprehensive electronic protection.

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 switchgear assemblies.
• Infrastructure and utility installations.