1SDA056388R1 ABB E3H1250 PR122/P-LSI 1250A 3P Withdrawable Air Circuit Breaker

Why Choose the ABB E3H1250 PR122/P-LSI 1250A 3P Withdrawable Air Circuit Breaker?

The ABB E3H1250 PR122/P-LSI, order code 1SDA056388R1, is a high-performance SACE Emax air circuit breaker moving part designed for protection and switching in demanding low-voltage electrical distribution systems. This E3H breaker has a rated current of 1250 A, a three-pole configuration and ABB's electronic PR122/P-LSI overcurrent release.

Designed as the moving portion of a withdrawable circuit-breaker installation, the E3H1250 enables convenient isolation, inspection and servicing within compatible SACE Emax switchgear. Its H short-circuit performance level provides a rated ultimate short-circuit breaking capacity of 100 kA at 400 V AC and 85 kA at 690 V AC.

The PR122/P-LSI R1250 electronic release provides long-time overload, short-time short-circuit and instantaneous short-circuit protection. Combined with its 1250 A rating, three-pole architecture, 690 V AC rated operational voltage and withdrawable construction, the 1SDA056388R1 is well suited to main incomers, feeders and critical industrial power distribution circuits.

Key Advantages

• High-performance 1250 A SACE Emax air circuit breaker moving part.
• Three-pole configuration for three-phase low-voltage distribution systems.
• PR122/P-LSI electronic overcurrent release provides long-time, short-time and instantaneous protection.
• Withdrawable construction supports convenient isolation, inspection and switchboard maintenance.
• High H-level short-circuit performance with 100 kA Icu at 400 V AC.
• Four auxiliary contacts and open/closed position indication support switchboard monitoring and control.

Key Features

• ABB SACE Emax E3H air circuit breaker moving part.
• 1250 A rated uninterrupted current.
• Three-pole configuration.
• PR122/P-LSI R1250 electronic overcurrent release.
• LSI protection functions for long-time, short-time and instantaneous overcurrent protection.
• H short-circuit performance level.
• Rated ultimate short-circuit breaking capacity of 100 kA at 400 V AC.
• Rated ultimate short-circuit breaking capacity of 85 kA at 690 V AC.
• Rated service short-circuit breaking capacity of 85 kA at 400 V AC and 690 V AC.
• Withdrawable moving-part construction for compatible SACE Emax switchgear.
• Rated operational voltage of 690 V AC.
• Four auxiliary contacts with circuit-breaker open/closed position indication.

Reliable High-Current Protection for Low-Voltage Distribution

Air circuit breakers such as the ABB SACE Emax E3H1250 protect electrical distribution systems against damaging overload and short-circuit conditions. The PR122/P-LSI electronic release combines long-time, short-time and instantaneous protection functions, enabling coordinated protection against sustained overloads and different levels of short-circuit fault.

The withdrawable moving-part design is particularly valuable in industrial switchboards where serviceability and operational flexibility are important. The breaker can be isolated from its compatible fixed part for inspection or maintenance, while its 1250 A rating, three-pole architecture and H-level short-circuit performance provide dependable protection for demanding three-phase distribution systems.

Typical Applications

• Main incoming protection for industrial low-voltage switchboards.
• High-current three-phase feeder and distribution circuit protection.
• Manufacturing plants and process facilities.
• Commercial and infrastructure power distribution systems.
• Motor control centres and large electrical distribution assemblies.
• Withdrawable switchgear requiring high short-circuit performance and serviceability.