1SDA073460R1 ABB E4.2N/MS 4000 4p FHR Switch Disconnector

Why Choose the ABB E4.2N/MS 4000 4p FHR Switch Disconnector?

The ABB E4.2N/MS 4000 4p FHR, order code 1SDA073460R1, is a high-current four-pole air switch disconnector from the ABB SACE Emax 2 range, designed for dependable switching and isolation in demanding low-voltage power distribution systems. Based on the E4.2 frame, this /MS version provides a substantial 4000 A rated uninterrupted current for major industrial, commercial and infrastructure electrical installations.

The E4.2N/MS performance level provides a rated short-time withstand current of 66 kA for 1 s, enabling the device to withstand high fault-current conditions while appropriately coordinated protective equipment provides automatic circuit protection. The /MS switch-disconnector configuration is designed to satisfy the isolation requirements of IEC 60947-3.

This model is supplied in a fixed four-pole configuration with horizontal rear terminals (FHR). With a rated operational voltage of 690 V AC, its high current capacity, robust Emax 2 construction and rear-connected arrangement make it particularly suitable for integration into high-power low-voltage switchboards.

Key Advantages

• High-capacity 4000 A four-pole air switch disconnector.
• 66 kA short-time withstand current for 1 s for demanding power distribution systems.
• Four-pole switching enables simultaneous isolation of four conductors.
• 690 V AC rated operational voltage suitable for industrial low-voltage networks.
• Fixed E4.2 construction for permanent switchboard installation.
• Horizontal rear terminals support efficient busbar and conductor connections.
• Part of the proven ABB SACE Emax 2 power distribution platform.

Key Features

• ABB SACE Emax 2 E4.2N/MS switch disconnector.
• 4000 A rated uninterrupted current (Iu).
• Four-pole configuration.
• 66 kA rated short-time withstand current (Icw) for 1 s.
• 690 V AC rated operational voltage.
• Switch-disconnector designed to meet IEC 60947-3 isolation requirements.
• Fixed installation configuration.
• Horizontal rear terminals (FHR).
• Robust E4.2 frame for high-current low-voltage distribution.
• Suitable for main switching and isolation duties in electrical switchboards.

Reliable High-Current Isolation for Power Distribution

ABB Emax 2 /MS switch disconnectors are designed for controlled switching and electrical isolation rather than automatic overcurrent protection. They provide a clear means of isolating sections of a low-voltage installation while dedicated protective equipment within the electrical system provides the required overload and short-circuit protection.

With its 4000 A continuous current rating and 66 kA 1-second short-time withstand capability, the E4.2N/MS is engineered for substantial power distribution loads. Its fixed four-pole design and horizontal rear connections make it particularly suitable for high-current switchboards where robust performance, dependable isolation and efficient busbar integration are required.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power distribution systems.
• High-current incoming and outgoing isolation duties.
• Transformer secondary distribution systems.
• Generator and standby power installations.
• Commercial and infrastructure electrical distribution.
• Manufacturing and process plant switchgear.