1SDA058947R1 ABB E2N/MS 1250 1250A 3-Pole Fixed Horizontal Rear Switch-Disconnector

Why Choose the ABB E2N/MS 1250 3-Pole Fixed Switch-Disconnector?

The ABB E2N/MS 1250 is a robust 1250 A three-pole fixed switch-disconnector designed for dependable switching and isolation in low-voltage electrical distribution systems. Part of the proven ABB SACE Emax E2 series, this N-performance device combines high current-carrying capability with a fixed construction and horizontal rear terminals for straightforward integration into industrial, commercial and infrastructure switchboards.

ABB Emax switch-disconnectors identified by the /MS designation are derived from the corresponding Emax circuit breakers, retaining their overall dimensions and accessory compatibility while omitting the overcurrent trip unit. The E2N/MS can be used according to AC-23A utilisation category in accordance with IEC 60947-3, making it suitable for switching motor loads and other highly inductive loads as well as general isolation duties.

The 1SDA058947R1 configuration is rated at 1250 A and features a three-pole fixed construction with horizontal rear terminals. With a rated operational voltage of up to 690 V AC, a 55 kA one-second short-time withstand current and a 121 kA peak short-circuit making capacity, it provides robust switching and isolation performance for demanding low-voltage power-distribution systems.

Key Advantages

• Proven ABB SACE Emax E2N/MS switch-disconnector platform.
• 1250 A rated uninterrupted current for substantial distribution loads.
• Three-pole configuration for three-phase switching and isolation.
• Fixed construction provides robust permanent switchboard integration.
• Horizontal rear terminals support convenient busbar connection.
• High 55 kA short-time withstand current for 1 s.
• 121 kA peak short-circuit making capacity.
• AC-23A utilisation category supports demanding inductive-load switching applications.

Key Features

• ABB SACE Emax E2N/MS 1250 switch-disconnector.
• 1250 A rated uninterrupted current.
• Three-pole construction.
• Fixed (F) installation version.
• Horizontal rear (HR) terminals.
• N performance level.
• 690 V AC / 250 V DC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 55 kA for 1 s rated short-time withstand current.
• 42 kA for 3 s rated short-time withstand current.
• 121 kA peak rated short-circuit making capacity.

Reliable High-Current Switching and Isolation

The ABB E2N/MS 1250 provides a dependable means of making, carrying and isolating three-phase electrical circuits without an integrated electronic overcurrent trip unit. Its 55 kA one-second short-time withstand rating, 42 kA three-second withstand rating and 121 kA peak making capacity support use in substantial low-voltage distribution systems when suitable protective equipment is coordinated elsewhere in the installation.

The fixed construction and horizontal rear terminals make the 1SDA058947R1 particularly suitable for permanent switchboard installations with rear busbar connections. Combined with its 1250 A current rating, AC-23A switching capability and established SACE Emax architecture, the E2N/MS 1250 provides a robust solution for industrial and commercial power-distribution applications requiring reliable switching and isolation.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power-distribution systems.
• Main incomer and feeder switching applications.
• Three-phase electrical isolation.
• Motor and highly inductive load switching under AC-23A duty.
• Manufacturing and process plants.
• Commercial and infrastructure electrical installations.
• Fixed switchgear and power-distribution assemblies.