1SDA055609R1 ABB E1B 800 PR121/P-LSI 800 A 4-Pole Air Circuit Breaker

Why Choose the ABB E1B 800 PR121/P-LSI Air Circuit Breaker?

The ABB E1B 800 PR121/P-LSI, order code 1SDA055609R1, is a robust SACE Emax air circuit breaker designed for protection and switching in low-voltage power distribution systems. This four-pole fixed circuit breaker combines an 800 A rated current with the electronic PR121/P-LSI overcurrent release for long-time overload, short-time short-circuit and instantaneous short-circuit protection.

Part of the proven ABB SACE Emax E1 series, the E1B 800 is designed for industrial switchboards, power distribution assemblies and infrastructure installations requiring reliable high-current circuit protection. Its LSI electronic protection functions provide adjustable response to overload and short-circuit conditions, supporting effective protection coordination throughout the electrical distribution system.

This configuration is a four-pole fixed circuit breaker with rear flat horizontal terminals. It has a rated uninterrupted current of 800 A, a rated operational voltage of 690 V AC and a rated ultimate short-circuit breaking capacity of 42 kA at 400/415 V AC.

Key Advantages

• High-capacity 800 A SACE Emax air circuit breaker for low-voltage power distribution.
• PR121/P-LSI electronic trip unit provides long-time, short-time and instantaneous protection.
• Four-pole configuration enables switching and protection of three phases and neutral.
• 42 kA short-circuit breaking capacity at 400/415 V AC.
• Fixed construction provides dependable permanent installation in switchboards.
• Rear flat horizontal terminals facilitate connection to switchboard busbars.

Key Features

• ABB SACE Emax E1B series.
• 800 A rated uninterrupted current.
• Four-pole configuration.
• Fixed circuit-breaker execution.
• PR121/P-LSI electronic overcurrent release.
• Long-time overload, short-time short-circuit and instantaneous short-circuit protection.
• 42 kA Icu at 400/415 V AC.
• 690 V AC rated operational voltage.
• 1,000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• Rear flat horizontal terminal connections.
• Four auxiliary change-over contacts for circuit-breaker status signalling.

Reliable LSI Protection for Low-Voltage Distribution

Air circuit breakers such as the ABB SACE Emax E1B provide switching, isolation and overcurrent protection for high-current low-voltage distribution circuits. The PR121/P-LSI electronic release provides long-time overload protection together with short-time and instantaneous short-circuit protection, helping safeguard cables, busbars and downstream equipment against damaging fault currents.

The four-pole fixed configuration is particularly suitable for distribution systems requiring simultaneous switching of three phases and neutral. Rear horizontal terminals provide a practical interface for busbar connections, while the fitted auxiliary contacts allow circuit-breaker open and closed status to be incorporated into monitoring, signalling and control systems.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Four-wire three-phase electrical networks.
• Commercial and infrastructure electrical installations.
• Transformer and generator distribution circuits.
• Manufacturing and process plant switchgear.