1SDA057439R1 ABB E3S-A 1200 PR121/P-LSIG 1200 A 3-Pole Fixed Air Circuit Breaker

Why Choose the ABB 1SDA057439R1 E3S-A 1200 Air Circuit Breaker?

The ABB 1SDA057439R1 is a high-performance SACE Emax E3S-A air circuit breaker designed for switching and protection in demanding low-voltage electrical distribution systems. Identified as E3S-A 1200 PR121/P-LSIG In=1200A 3p F HR, this three-pole fixed circuit 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 engineered for industrial, commercial and infrastructure power distribution. This version features fixed installation with rear horizontal terminals, providing a robust connection arrangement for integration into compatible low-voltage switchboards and power distribution assemblies.

The PR121/P-LSIG electronic trip unit provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. This configuration incorporates 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

• Heavy-duty ABB SACE Emax E3S-A air circuit breaker for low-voltage power distribution.
• 1200 A rated current for demanding industrial and commercial electrical systems.
• PR121/P-LSIG electronic overcurrent release for comprehensive circuit protection.
• LSIG functionality provides long-time, short-time, instantaneous and earth-fault protection.
• Three-pole fixed configuration for permanent switchboard installations.
• Rear horizontal terminals provide a practical connection arrangement for fixed switchgear.
• R1200 overcurrent release matched to the 1200 A breaker rating.
• Four auxiliary contacts and open/closed indication support circuit-breaker signalling and status monitoring.

Key Features

• ABB SACE Emax E3S-A series.
• 1200 A rated current.
• Three-pole configuration.
• Fixed (F) installation.
• Rear horizontal (HR) terminals.
• 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.
• Designed for UL low-voltage switchgear applications.

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. This comprehensive protection arrangement makes the 1SDA057439R1 suitable for distribution networks where selective fault protection and earth-fault detection are required alongside dependable high-current switching.

Typical Applications

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