1SDA056272R1 ABB E3S 2500 PR121/P-LI 2500A 3P Fixed Air Circuit Breaker

Why Choose the ABB E3S 2500 PR121/P-LI 2500A 3P Fixed Air Circuit Breaker?

The ABB 1SDA056272R1 is a high-performance SACE Emax E3S air circuit breaker designed for switching and protection in high-current low-voltage power distribution systems. Rated at 2500 A, this three-pole fixed circuit breaker incorporates an ABB PR121/P-LI electronic overcurrent release, providing dependable overload and instantaneous short-circuit protection for industrial and infrastructure electrical networks.

Part of the proven ABB SACE Emax E3 series, the E3S 2500 combines substantial current capacity with strong short-circuit performance. The S performance level provides a rated ultimate short-circuit breaking capacity of 75 kA at 415 V AC and a rated short-time withstand current of 75 kA for 1 s, supporting demanding main distribution and feeder applications.

This version uses a three-pole fixed configuration with horizontal rear terminals, providing a robust permanent installation within low-voltage switchboards. The breaker is equipped with four auxiliary contacts and open/closed position indication, while the PR121/P-LI release provides long-time overload (L) and instantaneous short-circuit (I) protection.

Key Advantages

• High-current 2500 A air circuit breaker for demanding power distribution systems.
• Three-pole fixed configuration for permanent switchboard installations.
• PR121/P-LI electronic trip unit provides overload and instantaneous short-circuit protection.
• 75 kA ultimate short-circuit breaking capacity at 415 V AC.
• 75 kA short-time withstand current for 1 s.
• Horizontal rear terminals support practical switchboard busbar connections.
• Four auxiliary contacts and open/closed position indication support monitoring and control.

Key Features

• ABB SACE Emax E3S 2500 air circuit breaker.
• 2500 A rated uninterrupted current.
• Three-pole configuration.
• PR121/P-LI electronic overcurrent release.
• LI protection functions: long-time overload and instantaneous short-circuit protection.
• 690 V AC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 75 kA rated ultimate short-circuit breaking capacity at 415 V AC.
• 75 kA rated service short-circuit breaking capacity at 415 V AC.
• 75 kA short-time withstand current for 1 s.
• Fixed construction with horizontal rear terminals.

Reliable LI Protection for High-Current Distribution

Air circuit breakers such as the ABB E3S 2500 provide switching, isolation and automatic circuit protection within high-current low-voltage distribution systems. The electronic release monitors circuit current and operates the breaker when configured protection thresholds are exceeded, helping protect switchgear, conductors and connected equipment against damaging electrical faults.

The PR121/P-LI release combines long-time overload protection with instantaneous short-circuit protection for straightforward and dependable circuit protection. Together with the E3S breaker's high short-circuit capability and fixed horizontal rear-terminal arrangement, the 1SDA056272R1 is well suited to permanent switchboard installations requiring reliable high-current protection.

Typical Applications

• Main incoming protection in low-voltage switchboards.
• Industrial power distribution systems.
• High-current feeder and distribution circuits.
• Manufacturing and process plant electrical systems.
• Commercial and infrastructure power distribution.
• Transformer and generator distribution switchboards.
• Fixed switchgear installations requiring high short-circuit performance.