1SDA056337R1 ABB E3H 800 PR121/P-LSI 800A 3P Fixed Air Circuit Breaker

Why Choose the ABB E3H 800 PR121/P-LSI 800A 3P Fixed Air Circuit Breaker?

The ABB 1SDA056337R1 is a high-performance SACE Emax E3H air circuit breaker designed for switching and protection in demanding low-voltage power distribution systems. Rated at 800 A, this three-pole fixed circuit breaker incorporates an ABB PR121/P-LSI R800 electronic overcurrent release, providing long-time, short-time and instantaneous overcurrent protection.

Part of the ABB SACE Emax E3 series, the E3H 800 combines an 800 A continuous current rating with high short-circuit interruption capability. At 400 V AC it provides a rated ultimate short-circuit breaking capacity of 100 kA and a rated service short-circuit breaking capacity of 85 kA, making it suitable for installations with substantial prospective fault currents.

The PR121/P-LSI release provides long-time overload (L), short-time short-circuit (S) and instantaneous short-circuit (I) protection, supporting selective and coordinated protection of distribution circuits. This version uses a three-pole fixed configuration with rear horizontal terminals and is supplied with four auxiliary contacts plus circuit-breaker open/closed position indication for switchboard integration.

Key Advantages

• 800 A SACE Emax air circuit breaker for demanding low-voltage distribution.
• E3H high-breaking-capacity performance for systems with high prospective fault currents.
• PR121/P-LSI electronic trip unit provides long-time, short-time and instantaneous protection.
• 100 kA ultimate short-circuit breaking capacity at 400 V AC.
• 85 kA service short-circuit breaking capacity at 400 V AC.
• 75 kA short-time withstand current for 1 s supports selective protection strategies.
• Fixed construction with rear horizontal terminals for permanent switchboard installation.
• Four auxiliary contacts and open/closed indication support monitoring and control.

Key Features

• ABB SACE Emax E3H 800 air circuit breaker.
• 800 A rated uninterrupted current.
• Three-pole configuration.
• PR121/P-LSI R800 electronic overcurrent release.
• LSI protection: long-time, short-time and instantaneous functions.
• 690 V AC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 100 kA Icu at 400 V AC.
• 85 kA Ics at 400 V AC.
• 75 kA Icw for 1 s and 65 kA for 3 s.
• Fixed installation with rear horizontal terminal connections.

Selective LSI Protection for High-Fault-Level Distribution

Air circuit breakers such as the ABB E3H 800 provide switching, isolation and automatic protection for important low-voltage distribution circuits. The electronic release monitors circuit current and commands the breaker to open when configured overload or short-circuit thresholds are exceeded, helping protect conductors, busbars, switchgear and connected equipment.

The PR121/P-LSI release adds short-time protection to the long-time and instantaneous functions, enabling improved protection coordination where selective tripping is required. Combined with the E3H breaker's 100 kA Icu at 400 V AC, substantial short-time withstand capability and fixed rear-horizontal connection arrangement, the 1SDA056337R1 is well suited to demanding permanent switchboard installations.

Typical Applications

• Main incoming protection in low-voltage switchboards.
• Industrial power distribution systems.
• High-fault-level 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.
• Distribution systems requiring coordinated LSI protection.