1SDA056282R1 ABB E3S2500PR121/P-LSIG 2500A 4-Pole Air Circuit Breaker

Why Choose the ABB E3S2500PR121/P-LSIG 2500A Air Circuit Breaker?

The ABB E3S2500PR121/P-LSIG is a high-performance 2500 A four-pole air circuit breaker designed for reliable switching and comprehensive overcurrent protection in demanding low-voltage power distribution systems. Part of the established ABB SACE Emax New Emax series, this E3S breaker combines high short-circuit performance with the PR121/P-LSIG electronic overcurrent release.

The PR121/P-LSIG trip unit provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. These LSIG functions help protect cables, busbars, switchboards and connected electrical equipment against sustained overloads, severe short-circuit currents and earth faults, making the breaker suitable for critical industrial and commercial distribution networks.

With a rated uninterrupted current of 2500 A, a four-pole fixed configuration and rear horizontal terminals, ABB order code 1SDA056282R1 is designed for integration into high-current low-voltage switchboards. The breaker incorporates a PR121/P-LSIG R2500 overcurrent release, four auxiliary contacts and circuit-breaker open/closed position indication for monitoring and control integration.

Key Advantages

• High-capacity 2500 A air circuit breaker for demanding low-voltage distribution.
• Four-pole fixed configuration suitable for three-phase four-wire power systems.
• Advanced PR121/P-LSIG R2500 electronic overcurrent release.
• LSIG functions provide long-time, short-time, instantaneous and earth-fault protection.
• 75 kA ultimate and service short-circuit breaking capacity across the specified operational-voltage range up to 690 V AC.
• Rear horizontal terminals provide a practical arrangement for high-current switchboard busbar connections.
• Four auxiliary contacts and open/closed position indication support monitoring and control systems.

Key Features

• ABB SACE Emax E3S series.
• 2500 A rated uninterrupted current.
• Four-pole circuit-breaker configuration.
• Fixed execution.
• Rear horizontal terminals (HR).
• PR121/P-LSIG electronic trip unit.
• R2500 overcurrent release.
• Long-time overload protection (L).
• Short-time short-circuit protection (S).
• Instantaneous short-circuit protection (I).
• Integrated earth-fault protection (G).

Comprehensive Protection for High-Current Power Distribution

Air circuit breakers such as the ABB E3S2500 provide switching and overcurrent protection for high-current low-voltage distribution circuits. The electronic trip release monitors circuit conditions and initiates breaker operation when configured protection thresholds are exceeded, helping protect cables, busbars, switchboards and connected electrical equipment against damaging overload, short-circuit and earth-fault currents.

The PR121/P-LSIG release combines four essential protection functions within a single electronic trip system. Together with the E3S frame's 75 kA short-circuit breaking capacity, 2500 A current rating, four-pole configuration and fixed rear-horizontal-terminal construction, this breaker is well suited to critical main distribution and high-current feeder applications requiring integrated earth-fault protection.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Three-phase four-wire distribution networks.
• Manufacturing and process facilities.
• Commercial and infrastructure electrical installations.
• Incoming mains and high-current feeder protection.
• Transformer secondary distribution systems.
• Circuits requiring integrated earth-fault protection.
• Fixed ABB SACE Emax switchgear assemblies.