1SDA057575R1 ABB E3H-A 1200 PR122/P-LSI 1200 A 3-Pole Fixed Air Circuit Breaker

Why Choose the ABB E3H-A 1200 PR122/P-LSI 1SDA057575R1 Air Circuit Breaker?

The ABB 1SDA057575R1 is a high-performance SACE Emax E3H-A air circuit breaker designed for reliable switching and protection in demanding low-voltage electrical distribution systems. As part of the ABB New Emax series, this three-pole fixed circuit breaker combines a 1200 A rated current with the PR122/P-LSI electronic overcurrent release for industrial, commercial and infrastructure power distribution applications.

The breaker is equipped with an ABB PR122/P-LSI R1200 electronic trip unit, providing long-time, short-time and instantaneous overcurrent protection. The LSI configuration supports coordinated protection against sustained overloads and short-circuit faults, while the breaker has an instantaneous current setting of 18000 A.

Configured as a three-pole fixed circuit breaker with rear flat horizontal terminals, the E3H-A 1SDA057575R1 is rated for operation at up to 600 V and provides a rated service short-circuit breaking capacity of 85 kA at 240 V AC, 480 V AC and 600 V AC. It is supplied with four auxiliary contacts and open/closed position indication for integration into compatible switchgear control and signalling systems.

Key Advantages

• Heavy-duty ABB SACE Emax E3H-A air circuit breaker for low-voltage power distribution.
• 1200 A rated current for high-current electrical installations.
• PR122/P-LSI R1200 electronic trip unit for comprehensive electronic overcurrent protection.
• LSI functions provide long-time, short-time and instantaneous protection.
• 85 kA rated service short-circuit breaking capacity at 240 V AC, 480 V AC and 600 V AC.
• Three-pole fixed configuration with rear flat horizontal terminals for switchboard integration.
• Four auxiliary contacts and open/closed position indication support signalling and control.

Key Features

• ABB SACE Emax E3H-A series.
• 1200 A rated current.
• Three-pole air circuit breaker.
• PR122/P-LSI R1200 electronic overcurrent release.
• 18000 A instantaneous current setting.
• Long-time overload protection.
• Short-time short-circuit protection.
• Instantaneous short-circuit protection.
• Fixed circuit-breaker configuration.
• Rear flat horizontal terminals.
• Four auxiliary contacts.
• Open/closed circuit-breaker position indication.
• UL 1066 standard.

High Breaking Capacity with Advanced LSI Protection

The ABB SACE Emax E3H-A is engineered for power distribution systems requiring high short-circuit performance. With a rated service short-circuit breaking capacity of 85 kA across 240 V AC, 480 V AC and 600 V AC applications, the 1SDA057575R1 provides robust protection for installations where substantial prospective fault currents may be present.

Its PR122/P-LSI electronic trip unit combines long-time overload, short-time short-circuit and instantaneous short-circuit protection. The short-time function supports selective coordination in appropriately designed distribution systems, helping downstream protective devices clear relevant faults before an upstream breaker operates and improving continuity across the wider installation.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical distribution.
• Manufacturing and process plant switchgear.
• Transformer and generator distribution circuits.
• High-current three-phase AC installations.
• Systems with high prospective short-circuit currents.
• Distribution networks requiring coordinated LSI overcurrent protection.