1SDA056372R1 ABB E3H1250 PR122/P-LSI 1250A 3-Pole Fixed Air Circuit Breaker

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

The ABB E3H1250 PR122/P-LSI, order code 1SDA056372R1, is a high-performance SACE Emax air circuit breaker (ACB) designed for switching and protection in demanding low-voltage electrical distribution systems. As part of the ABB SACE Emax E3 series, this three-pole fixed circuit breaker combines a 1250 A rated current with the PR122/P-LSI R1250 electronic overcurrent release.

The PR122/P-LSI trip unit provides long-time overload, short-time short-circuit and instantaneous short-circuit protection. This LSI configuration supports selective coordination and dependable protection against sustained overloads and short-circuit faults, making the breaker suitable for industrial, commercial and infrastructure power distribution applications.

With a 1250 A rated current, three-pole configuration, fixed construction and rear horizontal terminals, the E3H1250 is designed for permanent integration into low-voltage switchboards. Its E3H high-performance configuration provides substantial short-circuit interruption capability for electrical networks with demanding prospective fault levels.

Key Advantages

• High-performance ABB SACE Emax E3H air circuit breaker for demanding low-voltage distribution systems.
• 1250 A rated current for high-current electrical distribution applications.
• Three-pole configuration for three-phase electrical systems.
• Advanced PR122/P-LSI R1250 electronic overcurrent release.
• Long-time, short-time and instantaneous overcurrent protection.
• E3H high-breaking-capacity performance level for networks with substantial prospective fault currents.
• Fixed construction for permanent switchboard integration.
• Rear horizontal terminals provide a practical connection arrangement for switchboard busbar systems.

Key Features

• ABB SACE Emax E3H1250 air circuit breaker.
• 1250 A rated current.
• Three-pole (3P) configuration.
• PR122/P-LSI electronic overcurrent release.
• R1250 release rating.
• Long-time overload protection (L).
• Short-time short-circuit protection (S).
• Instantaneous short-circuit protection (I).
• Fixed (F) installation.
• Rear horizontal (HR) terminals.
• Four auxiliary contacts.
• Circuit-breaker open/closed position indication.
• Designed for demanding industrial and commercial low-voltage power distribution.

High-Performance Circuit Protection for Low-Voltage Power Distribution

Air circuit breakers such as the ABB SACE Emax E3H1250 provide switching, isolation and overcurrent protection for important low-voltage distribution circuits. The electronic trip unit monitors current conditions and initiates circuit-breaker operation when configured protection thresholds are exceeded, helping protect cables, switchgear and connected electrical equipment against damaging overloads and short circuits.

The PR122/P-LSI release provides three complementary levels of overcurrent protection. Long-time protection responds to sustained overloads, short-time protection supports selective fault clearing and coordination with downstream protective devices, while instantaneous protection provides rapid interruption of severe short-circuit currents. Combined with the E3H breaker's high short-circuit performance, the 1SDA056372R1 is well suited to demanding power distribution networks.

Typical Applications

• Main low-voltage electrical distribution switchboards.
• Industrial power distribution systems.
• Transformer and generator distribution systems.
• Commercial and infrastructure electrical installations.
• Manufacturing and process facilities.
• Incomer and high-capacity feeder protection.