1SDA073421R1 ABB E4.2N/MS 4000 3p FHR Switch Disconnector

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

The ABB E4.2N/MS 4000 3p FHR, order code 1SDA073421R1, 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, N performance level and fixed installation for major industrial, infrastructure and commercial switchboards.

The E4.2N/MS is a switch-disconnector rather than an Emax 2 air circuit breaker fitted 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 E4.2N/MS 4000 provides a rated short-time withstand current of 66 kA for 1 s and 36 kA for 3 s. The 1SDA073421R1 is a fixed three-pole version with orientable rear horizontal terminals (FHR), a rated operational voltage up to 690 V AC and IP30 frontal protection, providing a robust solution for high-current switchboard isolation.

Key Advantages

• Very high 4000 A rated uninterrupted current for major low-voltage distribution systems.
• Three-pole configuration for three-phase switching and isolation.
• 66 kA short-time withstand current for 1 s supports demanding high-current switchboards.
• 36 kA short-time withstand current for 3 s supports coordinated distribution-system designs.
• Fixed installation provides a robust permanent switchboard arrangement.
• Orientable 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 E4.2N/MS series.
• 4000 A rated uninterrupted current.
• 3-pole configuration.
• Switch-disconnector function.
• N performance level.
• Fixed mounting version.
• FHR orientable rear horizontal terminals.
• Bolted main-circuit connection.
• Rated operational voltage up to 690 V AC.
• 66 kA rated short-time withstand current for 1 s.
• 36 kA rated short-time withstand current for 3 s.
• IP30 frontal degree of protection.
• Optional voltage release and motor operating mechanism.
• Designed for switching and isolation without an integral Ekip electronic protection trip unit.

High-Current 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 E4.2N/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 66 kA short-time withstand current for 1 s enables the switch disconnector to withstand substantial fault current for the specified duration while the associated protection system clears the fault. Combined with fixed construction and orientable rear horizontal terminals, the 1SDA073421R1 provides a practical solution for high-capacity industrial and infrastructure 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 isolation.