1SDA056865R1 ABB E4H4000 PR121/P-LSI 4000A 3-Pole Withdrawable Air Circuit Breaker Moving Part

Why Choose the ABB E4H4000 PR121/P-LSI 4000A Air Circuit Breaker Moving Part?

The ABB E4H4000 PR121/P-LSI, order code 1SDA056865R1, is a high-performance SACE Emax moving part for a withdrawable air circuit breaker designed for switching and protection in demanding high-current low-voltage electrical distribution systems. Part of the ABB SACE Emax E4H series, this three-pole configuration combines a 4000 A rated uninterrupted current with the PR121/P-LSI R4000 electronic overcurrent release.

The PR121/P-LSI electronic trip unit provides long-time overload, short-time short-circuit and instantaneous short-circuit protection. These LSI functions help safeguard switchboards, busbars, feeders, cables and connected equipment against damaging overcurrent conditions while supporting coordinated protection in major industrial and infrastructure distribution networks.

Designed as the moving portion of a three-pole withdrawable E4H circuit breaker, the 1SDA056865R1 is intended for use with the corresponding ABB SACE Emax fixed part installed in the switchboard. The E4H platform provides an ultimate short-circuit breaking capacity of 100 kA at 400 V AC and 85 kA at 690 V AC, while the withdrawable architecture supports efficient inspection, servicing and replacement.

Key Advantages

• Genuine ABB SACE Emax E4H moving part for withdrawable circuit-breaker assemblies.
• 4000 A rated uninterrupted current for high-capacity low-voltage distribution.
• Three-pole construction for three-phase electrical systems.
• PR121/P-LSI R4000 electronic overcurrent release.
• LSI functions provide long-time, short-time and instantaneous overcurrent protection.
• 100 kA ultimate and service short-circuit breaking capacity at 400 V AC.
• Withdrawable architecture supports efficient inspection, maintenance and circuit-breaker replacement.

Key Features

• ABB SACE Emax E4H series.
• 4000 A rated uninterrupted current.
• Three-pole construction.
• Withdrawable moving-part execution.
• PR121/P-LSI R4000 electronic trip unit.
• Long-time (L) overload protection.
• Short-time (S) short-circuit protection.
• Instantaneous (I) short-circuit protection.
• 690 V AC rated operational voltage.
• Four auxiliary contacts with circuit-breaker open/closed position indication.

High-Performance Protection for Power Distribution

ABB SACE Emax E4H air circuit breakers provide switching, isolation and electronic overcurrent protection for high-current low-voltage distribution systems. The E4H performance level delivers high short-circuit interruption capability, helping protect major switchboards, busbars, feeders and connected electrical equipment in installations with substantial prospective fault currents.

The PR121/P-LSI electronic release combines long-time overload protection with short-time and instantaneous short-circuit functions. Together with the E4H4000 platform's 4000 A rating, three-pole configuration and withdrawable architecture, it provides a dependable and maintainable protection solution for critical industrial, commercial and infrastructure distribution systems.

Typical Applications

• Main incoming protection in high-capacity low-voltage switchboards.
• Industrial power distribution systems.
• Transformer secondary protection.
• High-current feeder protection.
• Manufacturing and process plants.
• Utility and infrastructure distribution systems.
• Large commercial and critical electrical installations.
• Three-phase withdrawable switchgear requiring high short-circuit performance.