1SDA055704R1 ABB E1N 800 PR121/P-LI 800A 4P Fixed Air Circuit Breaker

Why Choose the ABB E1N 800 PR121/P-LI 800A 4P Fixed Air Circuit Breaker?

The ABB E1N 800 PR121/P-LI, order code 1SDA055704R1, is a high-performance four-pole air circuit breaker (ACB) designed for protection and switching in low-voltage electrical distribution systems. As part of the established ABB SACE Emax E1 series, this breaker combines an 800 A rated current with the electronic PR121/P-LI protection release for dependable overload and short-circuit protection.

Designed in a fixed configuration, the E1N 800 provides robust circuit protection for industrial switchboards, power distribution panels and infrastructure installations. The N performance level provides a rated ultimate short-circuit breaking capacity of 50 kA at up to 690 V AC, while the four-pole construction enables simultaneous switching and protection across three phases and neutral.

This version is supplied with horizontal rear terminals and the PR121/P-LI electronic trip unit with an 800 A rating plug. Its LI protection functions provide long-time protection against overloads and instantaneous protection against high-level short circuits, making the breaker suitable for demanding low-voltage power distribution applications.

Key Advantages

• Heavy-duty ABB SACE Emax air circuit breaker for low-voltage power distribution.
• 800 A rated current for high-current industrial installations.
• Four-pole configuration for switching and protecting three phases and neutral.
• PR121/P-LI electronic protection release provides overload and instantaneous short-circuit protection.
• 50 kA ultimate and service short-circuit breaking capacity across a wide AC voltage range.
• Fixed breaker construction with horizontal rear terminals for switchboard installation.
• High electrical and mechanical endurance for dependable long-term service.

Key Features

• ABB SACE Emax E1N series.
• 800 A rated uninterrupted current.
• 4-pole air circuit breaker.
• PR121/P-LI electronic trip unit.
• Long-time (L) and instantaneous (I) protection functions.
• 690 V AC rated operational voltage.
• 50 kA rated ultimate short-circuit breaking capacity (Icu).
• 50 kA rated service short-circuit breaking capacity (Ics).
• 12 kV rated impulse withstand voltage.
• Fixed mounting configuration with horizontal rear terminals.

Reliable Protection for Low-Voltage Distribution Systems

Air circuit breakers such as the ABB E1N 800 provide switching, isolation and automatic protection for high-current low-voltage circuits. When abnormal current conditions occur, the electronic trip unit monitors the circuit and commands the breaker to interrupt the supply before excessive overload or short-circuit current can damage downstream equipment.

The PR121/P-LI release combines long-time overload protection with instantaneous short-circuit protection. Together with the E1N breaker’s high interruption capability and robust mechanical design, this makes the assembly well suited to main and feeder protection duties in industrial and commercial power distribution systems.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Main incoming and feeder circuit protection.
• Manufacturing and process plants.
• Commercial and infrastructure electrical installations.
• Generator and transformer distribution systems.
• Electrical control and power distribution panels.