1SDA056786R1 ABB E4S4000 PR121/P-LSIG 4000 A 3-Pole Fixed Air Circuit Breaker

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

The ABB 1SDA056786R1 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-LSIG, this three-pole fixed circuit breaker combines a 4000 A rated current with ABB's PR121/P-LSIG electronic overcurrent release for comprehensive 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. Its S short-circuit performance level provides an ultimate short-circuit breaking capacity of 75 kA at 400 V AC, while the fixed construction with rear horizontal terminals provides a robust arrangement for permanent installation within low-voltage switchboards.

The integrated PR121/P-LSIG electronic trip unit provides long-time overload (L), short-time short-circuit (S), instantaneous short-circuit (I) and ground-fault (G) protection. With a rated voltage of 690 V AC, three-pole configuration and 4000 A rated uninterrupted current, the 1SDA056786R1 is well suited to 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-LSIG electronic trip unit provides long-time, short-time, instantaneous and ground-fault protection.
• High 75 kA Icu at 400 V AC ultimate short-circuit breaking capacity.
• Integrated ground-fault protection provides additional protection for electrical distribution systems.
• Fixed construction with rear horizontal terminals for permanent switchboard installation.
• Rated for operation at 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 uninterrupted current.
• Three-pole circuit breaker configuration.
• PR121/P-LSIG electronic overcurrent release.
• Long-time overload, short-time delayed short-circuit, instantaneous short-circuit and ground-fault protection.
• 690 V AC rated voltage.
• 75 kA ultimate short-circuit breaking capacity at 400 V AC.
• Adjustable overload setting from 1600–4000 A.
• Adjustable short-time delayed short-circuit release from 4000–40000 A.
• Adjustable instantaneous short-circuit release from 6000–60000 A.
• Fixed circuit breaker design with rear horizontal terminals.
• Fitted with four auxiliary change-over contacts.
• Integrated open/closed circuit breaker position indication.
• Optional motor operating mechanism compatibility.

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, short circuits and ground faults.

The PR121/P-LSIG electronic release provides long-time overload, short-time delayed short-circuit, instantaneous short-circuit and ground-fault protection, with adjustable protection thresholds to suit the electrical installation. Combined with the E4S's high breaking performance and robust fixed construction, this makes the 1SDA056786R1 suitable for major distribution boards, switchboards and industrial installations where comprehensive and dependable 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.