1SDA056384R1 ABB Emax E3H1250 PR121/P-LI 1250 A 3-Pole Air Circuit Breaker

Why Choose the ABB 1SDA056384R1 Emax E3H1250 Air Circuit Breaker?

The ABB 1SDA056384R1 is a high-performance SACE Emax E3H1250 air circuit breaker moving portion designed for protection and switching in demanding low-voltage electrical distribution systems. Part of the ABB SACE Emax series, this three-pole withdrawable breaker combines a 1250 A rated current with the PR121/P-LI electronic overcurrent release.

Designed for industrial power distribution, switchboards and critical electrical installations, the E3H1250 provides dependable protection against overloads and short circuits. The PR121/P-LI electronic trip unit provides long-time and instantaneous protection functions, helping protect electrical distribution networks and connected equipment against sustained overcurrent and severe short-circuit conditions.

With a rated uninterrupted current of 1250 A, a three-pole configuration and rated operational voltage up to 690 V AC, the 1SDA056384R1 is suited to demanding high-current distribution applications. The E3H performance level provides an ultimate short-circuit breaking capacity of 100 kA at 220–500 V AC and 85 kA at 660–690 V AC, while the withdrawable moving-portion design supports efficient integration, servicing and maintenance within compatible SACE Emax switchgear.

Key Advantages

• Heavy-duty ABB SACE Emax air circuit breaker moving portion for low-voltage power distribution.
• 1250 A rated current for demanding industrial and infrastructure applications.
• Three-pole configuration for three-phase electrical distribution systems.
• PR121/P-LI electronic overcurrent release for dependable circuit protection.
• Long-time and instantaneous protection against overload and short-circuit conditions.
• 100 kA ultimate short-circuit breaking capacity at 220–500 V AC.
• 75 kA short-time withstand current for 1 s for demanding fault conditions.
• Withdrawable moving-portion construction supports convenient inspection, servicing and replacement.

Key Features

• ABB SACE Emax E3H1250 air circuit breaker moving portion.
• 1250 A rated uninterrupted current.
• Three-pole construction.
• PR121/P-LI electronic protection release.
• Long-time and instantaneous overcurrent protection.
• 690 V AC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 100 kA Icu at 220–500 V AC.
• 85 kA Icu at 660–690 V AC.
• 75 kA Icw for 1 s and 65 kA for 3 s.
• Withdrawable moving-portion configuration for compatible SACE Emax switchgear.
• Fitted with four auxiliary contacts and open/closed position indication.

Reliable Protection for High-Current Power Distribution

Air circuit breakers such as the ABB SACE Emax E3H1250 provide switching, isolation and overcurrent protection for high-current low-voltage electrical networks. They are commonly installed as incoming, feeder or distribution protection devices in industrial switchboards where dependable interruption of substantial fault currents is essential.

The PR121/P-LI electronic release provides long-time protection against sustained overloads together with instantaneous protection against severe short-circuit faults. Combined with the E3H breaker’s high short-circuit performance and withdrawable construction, this makes the 1SDA056384R1 well suited to demanding industrial and infrastructure power-distribution installations.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Manufacturing and process plant electrical systems.
• Transformer and generator distribution protection.
• High-current feeder protection.
• Commercial and infrastructure electrical installations.
• Withdrawable switchgear and power distribution assemblies.