1SDA057247R1 ABB E1B-A 1200 PR121/P-LSIG 1200 A 3-Pole Air Circuit Breaker

Why Choose the ABB E1B-A 1200 PR121/P-LSIG 1200 A Air Circuit Breaker?

The ABB E1B-A 1200 PR121/P-LSIG, order code 1SDA057247R1, is a SACE Emax E1B-A air circuit breaker designed for protection, switching and isolation in low-voltage power distribution systems. Rated at 1200 A, this three-pole breaker combines ABB's E1B-A platform with a PR121/P-LSIG electronic overcurrent release.

As part of the ABB SACE Emax family, the breaker is intended for industrial switchboards, power distribution systems and infrastructure applications requiring comprehensive electronic overcurrent protection. The PR121/P-LSIG release provides long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection.

With its 1200 A rating and three-pole configuration, the E1B-A 1200 is suitable for important incoming and feeder circuits where dependable protection and selective fault clearing are required. The addition of earth-fault protection makes the LSIG configuration particularly useful for distribution systems requiring protection against ground-fault currents as well as phase overcurrents.

Key Advantages

• 1200 A rated current for substantial low-voltage power distribution circuits.
• PR121/P-LSIG electronic overcurrent release for comprehensive circuit protection.
• LSIG protection functions cover overload, short-time and instantaneous short-circuit faults plus earth faults.
• Three-pole configuration for three-phase low-voltage distribution systems.
• Short-time protection supports selective coordination with downstream protective devices.
• Integrated earth-fault protection helps protect distribution systems against ground-fault conditions.
• ABB SACE Emax construction provides dependable switching and isolation for important circuits.
• Suitable for incoming, feeder, transformer secondary and industrial distribution duties.

Key Features

• ABB SACE Emax E1B-A series.
• 1200 A rated current.
• Three-pole configuration.
• PR121/P-LSIG electronic overcurrent release.
• Long-time overload protection (L).
• Short-time short-circuit protection (S).
• Instantaneous short-circuit protection (I).
• Earth-fault protection (G).
• Electronic trip technology for accurate high-current circuit protection.
• Designed for low-voltage industrial and infrastructure power distribution.

Comprehensive LSIG Protection for Power Distribution

Air circuit breakers such as the ABB SACE Emax E1 provide switching, isolation and fault protection for low-voltage electrical distribution systems. The E1B-A platform and 1200 A current rating make this configuration suitable for important incoming and feeder circuits in industrial, commercial and infrastructure switchboards.

The PR121/P-LSIG electronic release combines long-time overload, short-time short-circuit, instantaneous short-circuit and earth-fault protection. This combination supports selective protection strategies while helping protect conductors, busbars, transformers and connected equipment against both phase overcurrents and earth-fault conditions.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial incoming and feeder circuits.
• Manufacturing and process plant electrical systems.
• Commercial building power distribution.
• Transformer secondary distribution circuits.
• Distribution systems requiring earth-fault protection.
• Infrastructure and critical low-voltage power systems.