1SDA056392R1 ABB E3H1250 PR121/P-LI 1250 A 4-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB 1SDA056392R1 E3H1250 Air Circuit Breaker?

The ABB 1SDA056392R1 is a high-performance SACE Emax E3H air circuit breaker (ACB) moving part designed for protection and switching in demanding low-voltage electrical distribution systems. As part of the ABB New Emax E3 series, this four-pole withdrawable circuit breaker combines a 1250 A rated current with the PR121/P-LI electronic overcurrent release for dependable protection of industrial, commercial and infrastructure power installations.

The E3H1250 is equipped with ABB's PR121/P-LI R1250 electronic trip unit, providing long-time overload and instantaneous short-circuit protection. This LI configuration provides essential electronic overcurrent protection, while the four-pole construction supports switching across three phase conductors and the neutral conductor in compatible three-phase four-wire distribution systems.

With a 1250 A rated uninterrupted current, four-pole withdrawable moving-part construction and an ultimate short-circuit breaking capacity of 100 kA at 400 V AC, the 1SDA056392R1 is engineered for switchboards with substantial prospective fault currents. Its withdrawable design allows the moving part to be removed from the corresponding fixed cradle for inspection, servicing or replacement.

Key Advantages

• High-performance ABB SACE Emax E3H air circuit breaker moving part for demanding low-voltage distribution.
• 1250 A rated uninterrupted current for high-current industrial, commercial and infrastructure applications.
• PR121/P-LI electronic overcurrent release for long-time overload and instantaneous short-circuit protection.
• Four-pole construction supports three-phase systems requiring neutral switching.
• Ultimate short-circuit breaking capacity of 100 kA at 400 V AC for high-fault-level installations.
• Withdrawable moving-part design supports convenient inspection, servicing and replacement.
• Adjustable instantaneous short-circuit protection supports coordination with the wider distribution system.
• Four auxiliary contacts with open/closed position indication support circuit-breaker monitoring and control.

Key Features

• ABB SACE Emax E3H1250 series air circuit breaker.
• 1250 A rated uninterrupted current.
• Four-pole configuration.
• Withdrawable moving-part version.
• PR121/P-LI R1250 electronic overcurrent release.
• LI protection covering long-time overload and instantaneous short-circuit protection.
• 100 kA ultimate short-circuit breaking capacity at 400 V AC.
• Instantaneous short-circuit protection adjustable from 1875–18750 A.
• Four auxiliary contacts comprising 2 NO and 2 NC contacts.
• Circuit-breaker open/closed position indication.
• Optional motor operating mechanism compatibility.
• IP2X degree of protection.

Reliable Protection for High-Current Power Distribution

Air circuit breakers such as the ABB E3H1250 provide switching and protection for high-current low-voltage distribution systems. The electronic trip unit monitors current conditions and enables the breaker to interrupt overload and short-circuit faults, helping protect busbars, cables, transformers and connected electrical equipment from potentially damaging overcurrents.

The integrated PR121/P-LI electronic trip unit provides long-time overload and instantaneous short-circuit protection. Combined with the E3H breaker's 1250 A current rating, four-pole construction, 100 kA breaking capacity at 400 V AC and withdrawable configuration, the 1SDA056392R1 is particularly suited to main distribution circuits requiring dependable protection, high fault-clearing capability and maintainable switchgear.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plants.
• Commercial and large-building electrical distribution.
• Main incomer and high-current feeder protection.
• Three-phase four-wire electrical distribution systems.
• Generator and transformer distribution circuits.
• Power control centres and withdrawable switchgear assemblies.
• Infrastructure and utility installations with high prospective fault currents.