1SDA057543R1 ABB E3S-A 2500 PR122/P-LSI 2500 A 3-Pole Fixed Air Circuit Breaker

Why Choose the ABB E3S-A 2500 PR122/P-LSI 1SDA057543R1 Air Circuit Breaker?

The ABB 1SDA057543R1 is a high-performance SACE Emax E3S-A air circuit breaker designed for reliable switching and protection in high-current low-voltage electrical distribution systems. As part of the ABB New Emax series, this three-pole fixed breaker combines a 2500 A rated current with the PR122/P-LSI electronic overcurrent release for demanding industrial, commercial and infrastructure power distribution applications.

The breaker is equipped with an ABB PR122/P-LSI R2500 electronic trip unit, providing long-time, short-time and instantaneous overcurrent protection. The LSI configuration enables coordinated protection against sustained overloads and short-circuit faults, while the breaker has an instantaneous current setting of 37500 A.

Configured as a three-pole fixed circuit breaker, the E3S-A 1SDA057543R1 features rear horizontal terminals for integration into compatible low-voltage switchboards. It is also fitted with four auxiliary contacts and open/closed position indication, supporting signalling, monitoring and control within the electrical distribution system.

Key Advantages

• Heavy-duty ABB SACE Emax E3S-A air circuit breaker for low-voltage power distribution.
• 2500 A rated current for demanding high-current electrical installations.
• PR122/P-LSI R2500 electronic trip unit for comprehensive electronic overcurrent protection.
• LSI functions provide long-time, short-time and instantaneous protection.
• 37500 A instantaneous current setting for rapid response to severe short-circuit conditions.
• Three-pole fixed configuration with rear horizontal terminals for integration into compatible switchboards.
• Four auxiliary contacts and open/closed position indication support switchgear signalling and control.

Key Features

• ABB SACE Emax E3S-A series.
• 2500 A rated current.
• Three-pole air circuit breaker.
• PR122/P-LSI R2500 electronic overcurrent release.
• 37500 A instantaneous current setting.
• Long-time overload protection.
• Short-time short-circuit protection.
• Instantaneous short-circuit protection.
• Fixed circuit-breaker configuration.
• Rear horizontal terminals.
• Four auxiliary contacts.
• Open/closed circuit-breaker position indication.
• UL version for compatible low-voltage distribution installations.

Advanced LSI Protection for High-Current Power Distribution

Air circuit breakers such as the ABB SACE Emax E3S-A are designed to switch and protect high-current low-voltage distribution circuits. The PR122/P-LSI electronic trip unit provides long-time overload, short-time short-circuit and instantaneous short-circuit protection, helping safeguard conductors, busbars, switchgear and connected electrical equipment.

The short-time protection function adds flexibility for protection coordination compared with an LI-only release, allowing downstream protective devices time to clear appropriate faults before the upstream breaker operates. Combined with its 2500 A rating, fixed construction and rear horizontal terminals, the 1SDA057543R1 is well suited to demanding main and distribution switchboard applications.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical distribution.
• Manufacturing and process plant switchgear.
• Generator and transformer distribution circuits.
• High-current three-phase AC installations.
• Distribution systems requiring coordinated LSI overcurrent protection.