1SDA055969R1 ABB E2S1250 PR121/P-LSI 1250A 3-Pole Withdrawable Air Circuit Breaker Moving Part

Why Choose the ABB E2S1250 PR121/P-LSI 1250A 3-Pole Withdrawable Air Circuit Breaker?

The ABB 1SDA055969R1 is a high-performance SACE Emax E2S air circuit breaker (ACB) moving part designed for switching and protection in demanding low-voltage electrical distribution systems. Rated at 1250 A, this three-pole withdrawable circuit breaker moving part is equipped with the PR121/P-LSI R1250 electronic overcurrent release for dependable overload, short-time and instantaneous short-circuit protection.

As part of the ABB SACE Emax / New Emax range, the E2S1250 combines high short-circuit performance with adjustable electronic protection for industrial, commercial and infrastructure power distribution. The PR121/P-LSI release provides long-time, short-time and instantaneous protection functions, supporting selective coordination while helping protect cables, busbars, transformers and connected electrical equipment.

The E2S1250 PR121/P-LSI is a three-pole withdrawable moving part with a rated uninterrupted current of 1250 A and rated operational voltage of 690 V AC. Its S performance level provides an ultimate and service short-circuit breaking capacity of 85 kA at 400 V AC and 65 kA at 690 V AC, making it suitable for demanding distribution systems with high prospective fault currents.

Key Advantages

• High-capacity 1250 A SACE Emax air circuit breaker moving part.
• Three-pole configuration for three-phase electrical distribution systems.
• Electronic PR121/P-LSI R1250 overcurrent release.
• LSI protection provides long-time, short-time and instantaneous protection.
• 85 kA ultimate and service short-circuit breaking capacity at 400 V AC.
• 65 kA ultimate and service short-circuit breaking capacity at 690 V AC.
• Withdrawable moving-part construction supports serviceable and maintainable switchgear installations.
• Four auxiliary contacts with circuit-breaker open/closed position indication.

Key Features

• ABB SACE Emax E2S1250 air circuit breaker moving part.
• 1250 A rated uninterrupted current.
• Three-pole configuration.
• Withdrawable / draw-out construction.
• Moving part (MP) for compatible SACE Emax withdrawable switchgear.
• PR121/P-LSI R1250 electronic overcurrent release.
• Long-time, short-time and instantaneous LSI protection functions.
• 690 V AC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 85 kA Icu/Ics at 400 V AC.
• 65 kA Icu/Ics at 690 V AC.

High-Performance LSI Protection for Draw-Out Power Distribution

Air circuit breakers such as the ABB E2S1250 provide switching, isolation and protection for high-current low-voltage distribution circuits. The three-pole configuration is suited to three-phase systems, while the withdrawable architecture allows the circuit breaker moving part to be disconnected and removed from its corresponding fixed part for inspection, servicing or replacement within appropriately designed switchgear.

The PR121/P-LSI electronic release provides long-time protection against sustained overloads, short-time protection to support selective short-circuit coordination and instantaneous protection against severe fault currents. Combined with the E2S performance level and 85 kA breaking capacity at 400 V AC, these functions support dependable protection in demanding industrial and commercial electrical distribution networks.

Typical Applications

• Industrial low-voltage switchboards and distribution panels.
• Three-phase high-current electrical distribution systems.
• Main incoming circuit protection.
• High-fault-level feeder protection.
• Withdrawable and draw-out switchgear assemblies.
• Busbar and bus-coupler applications.
• Transformer secondary and generator distribution systems.
• Manufacturing, process, commercial and infrastructure installations.