1SDA073422R1 ABB E4.2H/MS 4000 3p FHR Switch Disconnector

Why Choose the ABB E4.2H/MS 4000 3p FHR Switch Disconnector?

The ABB E4.2H/MS 4000 3p FHR, order code 1SDA073422R1, is a high-current fixed SACE Emax 2 switch disconnector designed for dependable switching and isolation in demanding low-voltage power-distribution systems. Based on ABB's E4.2 frame, this three-pole unit combines a substantial 4000 A rated uninterrupted current, H performance level and fixed construction for major industrial, infrastructure and commercial switchboards.

The E4.2H/MS is a switch-disconnector rather than an Emax 2 air circuit breaker equipped with an Ekip electronic protection release. Its primary role is switching and isolation within a suitably protected electrical system, allowing high-current feeders, busbar sections and other distribution circuits to be disconnected while associated protective devices provide the required overcurrent and short-circuit protection.

The H-performance E4.2/MS configuration provides a rated short-time withstand current of 85 kA for 1 s. The 1SDA073422R1 is a fixed three-pole version with rear horizontal terminals (FHR), a rated operational voltage of 690 V AC and IP30 frontal protection, providing a robust isolation solution for high-capacity low-voltage switchboards.

Key Advantages

• Very high 4000 A rated uninterrupted current for major low-voltage distribution systems.
• Three-pole configuration for three-phase switching and isolation.
• H performance level provides enhanced short-time current withstand capability.
• 85 kA short-time withstand current for 1 s supports demanding high-fault-level switchboards.
• Fixed installation provides a robust permanent switchboard arrangement.
• Rear horizontal terminals support practical integration with high-current switchboard busbars.
• Suitable for operation at up to 690 V AC.

Key Features

• ABB SACE Emax 2 E4.2H/MS series.
• 4000 A rated uninterrupted current.
• 3-pole configuration.
• Switch-disconnector function.
• H performance level.
• Fixed mounting version.
• Rear horizontal main-circuit terminals.
• Bolted main-circuit connection.
• Rated operational voltage: 690 V AC.
• 85 kA rated short-time withstand current for 1 s.
• IP30 frontal degree of protection.
• Suitable for use as a main switch.
• Optional motor operating mechanism and voltage release.
• Designed for switching and isolation without an integral Ekip electronic protection trip unit.

High-Performance Switching and Isolation for Major Distribution Systems

Switch disconnectors provide a defined means of switching and isolating electrical circuits while operating alongside dedicated protective devices within the distribution system. The ABB E4.2H/MS 4000 combines a substantial 4000 A continuous-current rating with the robust SACE Emax 2 architecture, making it suitable for major switchboard positions where dependable high-current isolation is required without an integral electronic overcurrent trip unit.

Its H performance level provides an 85 kA short-time withstand current for 1 s, enabling the switch disconnector to withstand substantial fault current for the specified duration while the associated protective system operates. Combined with fixed construction and rear horizontal terminals, the 1SDA073422R1 provides a practical solution for high-capacity industrial, infrastructure and critical-power distribution assemblies.

Typical Applications

• Main and sectional isolation in high-current low-voltage switchboards.
• Industrial power-distribution systems.
• Transformer secondary distribution assemblies.
• Manufacturing and process-industry switchboards.
• Commercial and infrastructure electrical distribution.
• Utility and critical-power distribution systems.
• Generator and auxiliary power-distribution switchboards.
• Three-phase feeders requiring fixed 4000 A switching and high short-time withstand capability.