1SDA056788R1 ABB E4S4000PR122/P-LSI 4000A 3-Pole Air Circuit Breaker

Why Choose the ABB E4S4000PR122/P-LSI 4000A Air Circuit Breaker?

The ABB E4S4000PR122/P-LSI, order code 1SDA056788R1, is a high-performance 4000 A three-pole air circuit breaker designed for reliable switching and protection of demanding low-voltage electrical distribution systems. As part of the proven ABB SACE Emax E4 series, this fixed breaker combines the E4S performance class with the advanced PR122/P electronic overcurrent protection release.

The breaker is equipped with an ABB PR122/P-LSI R4000 electronic overcurrent release, providing long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection. These LSI protection functions support selective coordination and dependable fault protection in industrial switchboards, main distribution assemblies, transformer secondary systems and other high-current electrical installations.

With a rated current of 4000 A, a three-pole fixed configuration and rear horizontal terminals, the E4S4000PR122/P-LSI is engineered for permanent integration into high-capacity low-voltage switchgear. Its E4S platform combines robust short-circuit performance with electronic protection, auxiliary signalling and breaker position indication for demanding power distribution applications.

Key Advantages

• High-capacity 4000 A air circuit breaker for demanding low-voltage power distribution.
• Three-pole fixed configuration for permanent switchboard installation.
• Rear horizontal terminals for integration with compatible switchgear busbar systems.
• Advanced PR122/P-LSI R4000 electronic protection release.
• Long-time, short-time and instantaneous protection supports effective selective coordination.
• High E4S short-circuit performance for industrial and infrastructure power systems.
• Fitted with four auxiliary contacts for signalling and control.
• Integrated open/closed position indication supports breaker status monitoring.
• Part of the established ABB SACE Emax air circuit breaker platform.

Key Features

• ABB SACE Emax E4S 4000 air circuit breaker platform.
• 4000 A rated current.
• Three-pole construction.
• Fixed (F) breaker execution.
• Rear horizontal (HR) terminals.
• PR122/P-LSI R4000 electronic overcurrent release.
• Long-time overload protection.
• Short-time delayed short-circuit protection.
• Instantaneous short-circuit protection.
• Rated operational voltage up to 690 V AC.
• 75 kA ultimate short-circuit breaking capacity at 400/415 V AC.
• 75 kA rated short-time withstand current.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• Four auxiliary contacts and open/closed breaker position indication.

Reliable Protection for High-Current Power Distribution

Air circuit breakers such as the ABB SACE Emax E4 protect low-voltage electrical networks against damaging overcurrents while providing dependable switching and isolation of high-current circuits. Their robust construction, high short-circuit withstand capability and electronic protection technology make them particularly suitable for main incomers, transformer secondaries, large feeders and other critical power distribution circuits.

The PR122/P electronic release monitors circuit current and initiates breaker operation when configured protection thresholds are exceeded. In this LSI configuration, long-time protection responds to sustained overloads, short-time protection enables coordinated response to short-circuit conditions, and instantaneous protection provides rapid interruption of severe faults.

Typical Applications

• Main low-voltage switchboards and power distribution boards.
• Industrial high-current power distribution systems.
• Transformer secondary and main incomer protection.
• Large feeder circuits requiring selective protection.
• Manufacturing and process plant electrical systems.
• Commercial buildings, utilities and infrastructure installations.