1SDA056937R1 ABB E4V 4000 PR121/P-LSI 4000A 4-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB E4V 4000 PR121/P-LSI 4000A 4-Pole Withdrawable Air Circuit Breaker?

The ABB E4V 4000 PR121/P-LSI, order code 1SDA056937R1, is a high-capacity SACE Emax air circuit breaker moving part designed for protection and switching in demanding low-voltage electrical distribution systems. Part of the ABB SACE Emax E4 series, this configuration combines a 4000 A rated current, four-pole construction and withdrawable execution with ABB's PR121/P electronic protection technology.

The breaker is equipped with a PR121/P-LSI electronic overcurrent release, providing long-time, short-time and instantaneous protection functions for reliable management of overload and short-circuit conditions. Its E4V performance class is intended for installations requiring robust circuit protection and high current-handling capability in industrial and commercial power distribution.

With a rated current of 4000 A, four-pole configuration and withdrawable moving-part format, the E4V 4000 PR121/P-LSI is suited to main distribution boards, switchboards and other critical low-voltage power systems where maintainability and dependable protection are priorities. This version is also supplied with four auxiliary contacts for open/closed circuit-breaker position indication.

Key Advantages

• High-capacity 4000 A SACE Emax air circuit breaker for major low-voltage distribution systems.
• Four-pole construction enables switching and protection across all four poles.
• PR121/P-LSI electronic trip unit provides long-time, short-time and instantaneous overcurrent protection.
• Withdrawable moving-part execution supports servicing and maintenance in compatible Emax switchgear.
• E4V performance class designed for demanding industrial power-distribution applications.
• Includes four auxiliary contacts for circuit-breaker open/closed position signalling.

Key Features

• ABB SACE Emax E4V series.
• 4000 A rated current.
• Four-pole configuration.
• PR121/P electronic overcurrent release.
• LSI protection functions: long-time, short-time and instantaneous protection.
• Withdrawable moving part for compatible SACE Emax equipment.
• R4000 current-rating configuration.
• Four auxiliary contacts with open/closed position indication.

Reliable Circuit Protection for High-Current Power Distribution

Air circuit breakers such as the ABB SACE Emax E4V protect major low-voltage distribution circuits against abnormal overcurrent conditions while also providing controlled switching and isolation within electrical installations. The withdrawable architecture is particularly useful in switchboards where inspection, servicing and replacement need to be carried out with minimal disruption to the surrounding equipment.

The PR121/P-LSI electronic release monitors the protected circuit and provides long-time protection against sustained overloads, short-time protection for selective coordination and instantaneous protection against severe short circuits. This combination makes the E4V 4000 suitable for critical high-current feeders, incomers and distribution systems where dependable protection and coordination are essential.

Typical Applications

• Main low-voltage electrical distribution switchboards.
• Industrial power distribution and process plants.
• High-current incomer and feeder protection.
• Commercial and infrastructure electrical systems.
• Power distribution centres and main switchgear assemblies.
• Withdrawable circuit-breaker installations requiring electronic LSI protection.