1SDA056383R1 ABB E3H 1250 PR123/P-LSIG 1250A 4P Fixed Air Circuit Breaker

Why Choose the ABB E3H 1250 PR123/P-LSIG 1250A 4P Fixed Air Circuit Breaker?

The ABB 1SDA056383R1 is a high-performance SACE Emax E3H air circuit breaker designed for switching and protection in demanding low-voltage power distribution systems. Rated at 1250 A, this four-pole fixed circuit breaker incorporates ABB's advanced PR123/P-LSIG R1250 electronic overcurrent release, providing comprehensive protection for industrial, commercial and infrastructure electrical networks.

Part of the ABB SACE Emax E3 series, the E3H 1250 combines substantial current-handling capability with the high short-circuit performance associated with the E3H frame. The breaker is designed for low-voltage distribution applications requiring dependable interruption of high prospective fault currents and sophisticated electronic protection.

The PR123/P-LSIG release provides long-time overload (L), short-time short-circuit (S), instantaneous short-circuit (I) and earth-fault (G) protection. This version features a four-pole fixed configuration with rear horizontal terminals and is supplied with four auxiliary contacts plus circuit-breaker open/closed position indication for integration into compatible low-voltage switchboards.

Key Advantages

• 1250 A SACE Emax air circuit breaker for demanding low-voltage power distribution.
• E3H high-performance frame designed for installations with substantial prospective fault currents.
• Advanced PR123/P-LSIG electronic trip unit with overload, short-circuit and earth-fault protection.
• Four-pole configuration for comprehensive switching and protection.
• PR123/P release supports sophisticated protection and coordination requirements.
• Fixed construction provides a robust permanent switchboard installation.
• Rear horizontal terminals provide a practical arrangement for switchboard busbar connections.
• Four auxiliary contacts and open/closed position indication support monitoring and control integration.

Key Features

• ABB SACE Emax E3H 1250 air circuit breaker.
• 1250 A rated current.
• Four-pole configuration.
• PR123/P-LSIG R1250 electronic overcurrent release.
• LSIG protection: long-time, short-time, instantaneous and earth-fault functions.
• Designed for demanding low-voltage AC power distribution.
• Fixed circuit-breaker construction.
• Rear horizontal terminal arrangement.
• Four auxiliary circuit-breaker contacts.
• Open/closed circuit-breaker position indication.
• Suitable for high-current main and feeder protection.

Advanced LSIG Protection for High-Current Distribution

Air circuit breakers such as the ABB E3H 1250 provide switching, isolation and automatic protection for important low-voltage distribution circuits. The electronic overcurrent release monitors electrical conditions and commands the breaker to open when configured overload, short-circuit or earth-fault thresholds are reached, helping protect conductors, busbars, switchgear and connected equipment.

The PR123/P-LSIG release combines long-time, short-time, instantaneous and earth-fault protection functions for comprehensive protection and coordination within sophisticated electrical networks. Combined with the E3H frame's high-performance design and the breaker's fixed rear-horizontal-terminal arrangement, the 1SDA056383R1 is particularly suited to permanent switchboard installations requiring advanced electronic protection at 1250 A.

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-fed low-voltage distribution boards.
• Generator and standby power switchboards.
• Critical installations requiring comprehensive LSIG electronic protection.