1SDA056577R1 ABB E3V 1250 PR121/P-LSI 1250A 3P Withdrawable Air Circuit Breaker

Why Choose the ABB E3V 1250 PR121/P-LSI Air Circuit Breaker?

The ABB E3V 1250 PR121/P-LSI, order code 1SDA056577R1, is a high-performance withdrawable air circuit breaker (ACB) moving part designed for protection and switching in demanding low-voltage electrical distribution systems. As part of the proven ABB SACE Emax E3 series, this three-pole breaker combines a 1250 A rated current with the PR121/P-LSI electronic overcurrent release.

The PR121/P-LSI trip unit provides long-time, short-time and instantaneous overcurrent protection, helping protect electrical installations against overload and short-circuit conditions. The E3V performance level provides high short-circuit capability for industrial switchboards, power distribution assemblies and infrastructure applications where dependable protection and service continuity are essential.

This version is configured as a 3-pole withdrawable breaker moving part (W MP) with a rated operational voltage up to 690 V AC. It is fitted with four change-over auxiliary contacts and circuit-breaker open/closed position indication, while its withdrawable construction supports convenient inspection and maintenance within compatible SACE Emax switchgear.

Key Advantages

• High-performance ABB SACE Emax air circuit breaker moving part for low-voltage distribution.
• 1250 A rated current for substantial industrial and commercial loads.
• PR121/P-LSI electronic protection release for overload and short-circuit protection.
• 3-pole withdrawable moving-part configuration supports serviceable switchboard designs.
• Rated operational voltage up to 690 V AC.
• High short-circuit performance for demanding electrical distribution systems.

Key Features

• ABB SACE Emax E3V air circuit breaker moving part.
• 1250 A rated current.
• 3-pole configuration.
• PR121/P-LSI R1250 electronic overcurrent release.
• LSI protection functions: long-time, short-time and instantaneous.
• Withdrawable (W) moving part (MP) version.
• 690 V AC rated operational voltage.
• 130 kA ultimate short-circuit breaking capacity at 400 V AC.
• 85 kA short-time withstand current for 1 s.
• Fitted with four change-over auxiliary contacts and open/closed position indication.

Reliable Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB E3V provide switching and protection for high-current low-voltage distribution circuits. The PR121/P-LSI electronic release monitors current and provides long-time, short-time and instantaneous protection functions, helping safeguard electrical installations against overloads and short circuits.

The withdrawable SACE Emax design is particularly suited to switchboards where serviceability and operational flexibility are important. The moving breaker section is designed for use with a compatible fixed part, allowing the circuit breaker to be withdrawn for inspection or maintenance while supporting efficient management of industrial power distribution equipment.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plants.
• Commercial and infrastructure electrical installations.
• Generator and transformer distribution systems.
• Power control centres and withdrawable switchgear assemblies.