1SDA057249R1 ABB E1B-A 1200 PR121/P-LSIG 1200 A 3-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB 1SDA057249R1 E1B-A 1200 Air Circuit Breaker?

The ABB 1SDA057249R1 is a high-performance SACE Emax E1B-A air circuit breaker moving part designed for switching and protection in demanding low-voltage electrical distribution systems. Identified as E1B-A 1200 PR121/P-LSIG In=1200A 3p W MP, this three-pole withdrawable configuration combines a 1200 A rated current with an ABB PR121/P-LSIG electronic overcurrent release.

As part of the ABB SACE Emax / New Emax range, the E1B-A platform is engineered for reliable circuit protection in industrial, commercial and infrastructure power systems. Its withdrawable moving-part construction supports switchgear installations where inspection, maintenance and replacement flexibility are important operational requirements.

The PR121/P-LSIG electronic trip unit provides long-time, short-time, instantaneous and earth-fault protection functions. This three-pole withdrawable moving part uses an R1200 overcurrent release and has an instantaneous release reference of 18,000 A, providing comprehensive protection for high-current distribution circuits.

Key Advantages

• Heavy-duty ABB SACE Emax E1B-A air circuit breaker moving part for low-voltage power distribution.
• 1200 A rated current for high-capacity industrial and commercial circuits.
• PR121/P-LSIG electronic overcurrent release provides 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 breaker rating.
• Fitted with four auxiliary contacts for signalling and control.
• Open/closed position indication provides clear circuit-breaker status information.

Key Features

• ABB SACE Emax E1B-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 for compatible low-voltage switchgear applications.

Comprehensive Protection for High-Current Distribution

Air circuit breakers such as the ABB SACE Emax E1B-A provide switching, isolation and overcurrent protection for low-voltage electrical distribution systems. Electronic trip technology monitors circuit conditions and initiates interruption when configured protection thresholds are exceeded, helping protect conductors, equipment and downstream electrical networks.

The PR121/P-LSIG release provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. Combined with the withdrawable SACE Emax architecture, the 1SDA057249R1 provides a practical solution for switchboards where comprehensive protection, operational flexibility and ease of maintenance are key requirements.

Typical Applications

• Low-voltage power distribution switchboards.
• Industrial incoming and feeder circuits.
• Manufacturing and process facilities.
• Commercial building electrical distribution.
• Infrastructure power systems.
• Generator and transformer distribution circuits.
• Critical power distribution installations.
• Withdrawable switchgear requiring comprehensive LSIG protection.