1SDA055625R1 ABB E1B 800 PR121/P-LSI 800A 4-Pole Air Circuit Breaker

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

The ABB E1B 800 PR121/P-LSI, order code 1SDA055625R1, is a high-performance 800 A four-pole air circuit breaker moving part designed for protection and switching in low-voltage electrical distribution systems. As part of the established ABB SACE Emax series, it combines robust circuit-breaking performance with a PR121/P-LSI electronic overcurrent release for dependable protection of industrial power networks.

This E1B circuit breaker is supplied in a withdrawable moving-part configuration, allowing the breaker to be disconnected and removed from its compatible fixed part for inspection, servicing or replacement. The PR121/P-LSI electronic trip unit provides long-time, short-time and instantaneous protection functions, helping protect electrical installations against sustained overloads and short-circuit faults.

With a rated uninterrupted current of 800 A, four-pole construction and a rated ultimate short-circuit breaking capacity of 42 kA at up to 690 V AC, the E1B 800 is engineered for demanding industrial distribution applications. Its withdrawable construction and auxiliary signalling capability make it particularly suitable for switchboards where maintainability, operational continuity and reliable circuit protection are important.

Key Advantages

• Robust 800 A air circuit breaker for low-voltage power distribution.
• Four-pole configuration suitable for switching and protecting three-phase systems with neutral.
• PR121/P-LSI electronic trip unit provides comprehensive overcurrent protection.
• LSI protection functions cover long-time overload, short-time and instantaneous short-circuit conditions.
• 42 kA rated ultimate short-circuit breaking capacity across the specified AC operating-voltage range.
• Withdrawable moving-part design simplifies inspection, servicing and replacement.
• Four auxiliary contacts support circuit-breaker status signalling.
• ABB SACE Emax construction provides dependable performance in demanding industrial switchgear.

Key Features

• ABB SACE Emax E1B series.
• 800 A rated uninterrupted current.
• Four-pole configuration.
• PR121/P-LSI electronic overcurrent release.
• Long-time (L) overload protection.
• Short-time (S) short-circuit protection.
• Instantaneous (I) short-circuit protection.
• 42 kA Icu rated ultimate short-circuit breaking capacity.
• 42 kA Ics rated service short-circuit breaking capacity.
• 42 kA Icw for 1 s short-time withstand current.
• 12 kV rated impulse withstand voltage.
• 1,000 V rated insulation voltage.
• Withdrawable circuit-breaker moving part.
• Four auxiliary contacts for open/closed position signalling.

Reliable Protection for Low-Voltage Distribution Systems

Air circuit breakers such as the ABB SACE Emax E1B protect high-current electrical distribution systems by interrupting abnormal current conditions before cables, switchgear and connected equipment can be damaged. The E1B performance level provides a 42 kA ultimate breaking capacity throughout its specified low-voltage AC range, making this breaker suitable for substantial industrial fault levels.

The PR121/P-LSI electronic release combines long-time overload, short-time short-circuit and instantaneous short-circuit protection in one trip unit. Its adjustable protection thresholds enable coordination with the wider electrical installation, while the withdrawable construction facilitates maintenance and replacement within compatible SACE Emax switchgear assemblies.

Typical Applications

• Industrial low-voltage distribution switchboards.
• Main incoming and distribution circuit protection.
• Four-pole three-phase and neutral distribution systems.
• Manufacturing plants and production facilities.
• Commercial and infrastructure electrical distribution systems.
• Motor control centres and industrial power systems.
• Generator and transformer distribution installations.
• Power distribution panels requiring withdrawable circuit breakers.