1SDA056785R1 ABB E4S4000 PR121/P-LSI 4000 A 3-Pole Fixed Air Circuit Breaker

Why Choose the ABB E4S4000 PR121/P-LSI Air Circuit Breaker?

The ABB 1SDA056785R1 is a high-performance SACE Emax E4S air circuit breaker designed for switching and protection in high-current low-voltage electrical distribution systems. Identified as E4S4000 PR121/P-LSI, this three-pole fixed circuit breaker combines a 4000 A rated current with ABB's PR121/P-LSI electronic overcurrent release for dependable circuit protection.

As part of the ABB SACE Emax / New Emax range, the E4S4000 is engineered for demanding industrial, commercial and infrastructure power distribution applications. The S short-circuit performance level provides an ultimate short-circuit breaking capacity of 75 kA at 400 V AC, with the same 75 kA rating maintained across the specified 220–690 V AC range. Its fixed construction and rear horizontal terminals provide a robust arrangement for permanent installation within low-voltage switchboards.

The integrated PR121/P-LSI electronic trip unit provides long-time overload (L), short-time short-circuit (S) and instantaneous short-circuit (I) protection. With a rated operational voltage of 690 V AC, three-pole configuration and 4000 A rated uninterrupted current, the 1SDA056785R1 is ideal for main incoming, feeder and distribution protection duties in substantial low-voltage installations.

Key Advantages

• High-capacity 4000 A air circuit breaker for demanding low-voltage power distribution.
• Three-pole configuration designed for three-phase electrical systems.
• PR121/P-LSI electronic trip unit provides long-time, short-time and instantaneous overcurrent protection.
• 75 kA Icu at 400 V AC ultimate short-circuit breaking capacity.
• 75 kA Ics at 400 V AC service short-circuit breaking capacity.
• Fixed construction with rear horizontal terminals for permanent switchboard installation.
• Rated for operation at up to 690 V AC.
• Fitted with four auxiliary change-over contacts and open/closed circuit breaker position indication.

Key Features

• ABB SACE Emax E4S series.
• 4000 A rated operational and uninterrupted current.
• Three-pole circuit breaker configuration.
• PR121/P-LSI electronic overcurrent release.
• Long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection.
• 690 V AC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 75 kA Icu and Ics at 400 V AC.
• 75 kA short-time withstand current for 1 s and 3 s.
• Fixed circuit breaker design with rear horizontal terminals.
• 15,000-operation mechanical endurance.
• Fitted with four auxiliary change-over contacts.
• Integrated open/closed circuit breaker position indication.

Reliable Protection for High-Current Power Distribution

Air circuit breakers such as the ABB E4S4000 provide switching and protection for high-current low-voltage distribution systems. The circuit breaker interrupts abnormal current conditions to help protect cables, busbars, switchgear and connected equipment against damage caused by overloads and short circuits.

The PR121/P-LSI electronic release provides long-time overload, short-time delayed and instantaneous short-circuit protection, with adjustable protection thresholds to suit the electrical installation. Combined with the E4S's 75 kA breaking performance and robust fixed construction, this makes the 1SDA056785R1 suitable for major distribution boards, switchboards and industrial installations where dependable and selective electrical protection is required.

Typical Applications

• Main incoming circuit protection in high-current low-voltage switchboards.
• Industrial power distribution systems.
• Transformer and generator secondary distribution systems.
• Protection of high-current distribution feeders and busbar systems.
• Large commercial and infrastructure electrical installations.
• Manufacturing plants and process facilities.
• High-current switchgear and electrical distribution assemblies.