1SDA057441R1 ABB E3S-A 1200 PR121/P-LSIG 1200 A 3-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB 1SDA057441R1 E3S-A 1200 Air Circuit Breaker?

The ABB 1SDA057441R1 is a SACE Emax E3S-A air circuit breaker moving part designed for switching and protection in demanding low-voltage electrical distribution systems. Identified as E3S-A 1200 PR121/P-LSIG In=1200A 3p W MP, this three-pole withdrawable breaker combines a 1200 A rated current with the ABB PR121/P-LSIG electronic overcurrent release.

As part of the ABB SACE Emax / New Emax range, the E3S-A platform is designed for industrial, commercial and infrastructure power distribution. The withdrawable moving-part construction is intended for use with the appropriate fixed part, providing a practical architecture for switchgear installations where inspection, servicing and operational flexibility are important.

The PR121/P-LSIG electronic trip unit provides long-time, short-time, instantaneous and earth-fault protection. This configuration uses an R1200 overcurrent release with an 18,000 A instantaneous release reference and is fitted with four auxiliary contacts plus circuit-breaker open/closed position indication.

Key Advantages

• ABB SACE Emax E3S-A construction for demanding low-voltage power distribution.
• 1200 A rated current for industrial, commercial and infrastructure circuits.
• PR121/P-LSIG electronic overcurrent release for comprehensive circuit protection.
• LSIG functionality provides long-time, short-time, instantaneous and earth-fault protection.
• Three-pole withdrawable configuration supports maintainable switchgear installations.
• R1200 overcurrent release matched to the 1200 A rated current.
• Four auxiliary contacts support signalling and control functions.
• Open/closed position indication supports circuit-breaker status monitoring.

Key Features

• ABB SACE Emax E3S-A series.
• 1200 A rated current.
• Three-pole configuration.
• Withdrawable (W) moving part (MP).
• PR121/P-LSIG electronic trip unit.
• R1200 overcurrent release.
• Long-time overload protection.
• Short-time short-circuit protection.
• Instantaneous short-circuit protection.
• Earth-fault protection.
• 18,000 A instantaneous release reference.
• Four auxiliary contacts.
• Circuit-breaker open/closed position indication.
• UL configuration.

Comprehensive LSIG Protection for Power Distribution

Air circuit breakers such as the ABB SACE Emax E3S-A provide switching, isolation and overcurrent protection for low-voltage electrical distribution systems. Electronic trip technology monitors circuit conditions and enables the breaker to interrupt the supply when configured protection thresholds are exceeded, helping safeguard conductors, switchgear and downstream electrical equipment.

The PR121/P-LSIG release combines long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. Together with the withdrawable E3S-A architecture, the 1SDA057441R1 is well suited to distribution systems requiring comprehensive electronic protection and convenient access for switchgear inspection and maintenance.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial incoming and feeder circuits.
• Manufacturing and process facilities.
• Commercial building electrical distribution.
• Infrastructure power systems.
• Transformer secondary distribution circuits.
• Generator distribution and power-management systems.
• High-current distribution feeders.
• Withdrawable switchgear requiring electronic LSIG protection.