1SDA073406R1 ABB E2.2N/MS 1250 3p FHR Switch-Disconnector 1250 A

Why Choose the ABB E2.2N/MS 1250 3p FHR Switch-Disconnector?

The ABB E2.2N/MS 1250 3p FHR, order code 1SDA073406R1, is a high-performance three-pole switch-disconnector from the ABB SACE Emax 2 range, designed for switching and isolation duties in low-voltage power distribution systems. With a rated uninterrupted current of 1250 A, it combines the E2.2 frame with the N/MS performance level for industrial, commercial and infrastructure applications.

Unlike an Emax 2 circuit breaker fitted with an electronic protection release, the E2.2N/MS is a switch-disconnector configuration intended primarily for controlled switching and electrical isolation. It is particularly suitable where overcurrent and short-circuit protection is provided by other coordinated protective devices while a robust high-current disconnection point is required within the switchboard.

This version is supplied in a fixed three-pole configuration with rear horizontal terminals. It is rated for operation up to 690 V AC and provides a rated short-time withstand current of 66 kA for 1 s and 50 kA for 3 s, supporting demanding low-voltage distribution applications with high prospective fault currents.

Key Advantages

• High-current 1250 A three-pole switch-disconnector for low-voltage power distribution.
• Part of the proven ABB SACE Emax 2 E2.2 platform.
• 66 kA short-time withstand current for 1 s for demanding electrical networks.
• Rated for operation up to 690 V AC.
• Fixed construction provides a robust solution for permanent switchboard installations.
• Rear horizontal terminals support practical integration into compatible distribution assemblies.

Key Features

• ABB SACE Emax 2 E2.2 platform.
• 1250 A rated uninterrupted current.
• Three-pole configuration.
• N/MS performance level.
• Switch-disconnector configuration for switching and isolation duties.
• 690 V AC rated operational voltage.
• 1000 V AC rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 66 kA Icw for 1 s.
• 50 kA Icw for 3 s.
• Fixed installation version.
• Rear flat horizontal main terminals.
• Optional motor operator and voltage release capability.
• Interlockable construction for switchgear applications.

High-Current Switching and Isolation for Power Distribution

Switch-disconnectors provide controlled switching and electrical isolation within low-voltage distribution systems. In an Emax 2 MS configuration, the device provides the switching and isolation functions of the Emax 2 platform without the electronic overcurrent protection release normally associated with an air circuit breaker, allowing protection to be coordinated through other devices in the installation.

The E2.2N/MS 1250 combines a 1250 A continuous current rating with a 66 kA short-time withstand capability for 1 s and operation up to 690 V AC. Its fixed construction and rear horizontal terminals make it well suited to main switchboards and high-current distribution assemblies requiring a dependable three-pole switching and isolation device.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• High-current switching and isolation applications.
• Commercial and infrastructure electrical installations.
• Transformer and generator distribution systems.
• Switchgear assemblies where overcurrent protection is provided by separate protective devices.
• Incoming and outgoing distribution circuits requiring a fixed isolation device.