1SDA056289R1 ABB E3S 2500 PR121/P-LSI 2500 A 3-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB E3S 2500 PR121/P-LSI Air Circuit Breaker?

The ABB E3S 2500 PR121/P-LSI, order code 1SDA056289R1, is a high-performance SACE Emax air circuit breaker moving part designed for switching and protection of high-current low-voltage power distribution systems. Part of the ABB SACE Emax E3 series, this three-pole withdrawable breaker combines a 2500 A rated current with the PR121/P-LSI electronic overcurrent release for dependable protection in demanding industrial and commercial installations.

The PR121/P-LSI R2500 electronic trip unit provides long-time, short-time and instantaneous overcurrent protection. These LSI functions help safeguard electrical networks against overload and short-circuit conditions while supporting selective coordination between protective devices throughout low-voltage distribution systems.

The E3S performance level provides a rated ultimate short-circuit breaking capacity of 75 kA at 415 V AC and a rated short-time withstand current of 75 kA for 1 s. This version is a three-pole withdrawable moving part designed for use with the corresponding E3 fixed part and includes four auxiliary contacts with circuit-breaker open/closed position indication.

Key Advantages

• Heavy-duty 2500 A air circuit breaker moving part for high-current power distribution.
• PR121/P-LSI R2500 electronic overcurrent release for dependable circuit protection.
• LSI functions provide long-time, short-time and instantaneous protection.
• Three-pole withdrawable configuration supports maintainable switchgear installations.
• 75 kA short-circuit breaking capacity at 415 V AC for demanding distribution networks.
• Four auxiliary contacts and open/closed position indication support switchboard monitoring and control.

Key Features

• ABB SACE Emax E3S series.
• 2500 A rated uninterrupted current.
• 690 V AC rated operational voltage.
• PR121/P-LSI R2500 electronic trip unit.
• Long-time, short-time and instantaneous overcurrent protection.
• Three-pole construction.
• Withdrawable moving part (WMP) configuration.
• 75 kA rated ultimate short-circuit breaking capacity at 415 V AC.
• 75 kA rated short-time withstand current for 1 s.
• Four auxiliary contacts with circuit-breaker open/closed position indication.

Withdrawable LSI Protection for Power Distribution

Air circuit breakers such as the ABB E3S protect high-current low-voltage distribution circuits by interrupting the supply when electrical conditions exceed configured protection thresholds. The PR121/P electronic release provides accurate detection of overload and short-circuit conditions, helping safeguard conductors, switchgear and connected equipment.

The withdrawable moving-part design enables the breaker to be inserted into and removed from its corresponding fixed part, supporting isolation, inspection and maintenance of critical switchgear. Combined with the E3S platform and PR121/P-LSI protection, this makes the 1SDA056289R1 particularly suitable for distribution systems where high fault capability and serviceability are important.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plants.
• Commercial and infrastructure electrical installations.
• Transformer-fed low-voltage distribution circuits.
• Withdrawable switchgear and high-current distribution assemblies.