1SDA058946R1 ABB E1N/MS 1250 1250A 4-Pole Withdrawable Switch-Disconnector Moving Part

Why Choose the ABB E1N/MS 1250 4-Pole Withdrawable Switch-Disconnector?

The ABB E1N/MS 1250 is a robust 1250 A four-pole switch-disconnector moving part designed for dependable switching and isolation in low-voltage electrical distribution systems. Part of the proven ABB SACE Emax E1 series, this N-performance device combines substantial current-carrying capability with a withdrawable construction for flexible integration into industrial, commercial and infrastructure switchgear.

ABB Emax switch-disconnectors identified by the /MS designation are derived from the corresponding Emax circuit breakers and retain their overall dimensions and accessory compatibility while omitting the electronic overcurrent trip unit. The E1N/MS is suitable for AC-23A utilisation category applications in accordance with IEC 60947-3, including switching of motor loads and other highly inductive loads.

The 1SDA058946R1 configuration is rated at 1250 A and features a four-pole withdrawable moving part (W MP). With a rated operational voltage of 690 V AC, a 50 kA one-second short-time withstand current and a 105 kA peak short-circuit making capacity, it provides reliable isolation for demanding low-voltage distribution systems.

Key Advantages

• Proven ABB SACE Emax E1N/MS switch-disconnector platform.
• 1250 A rated uninterrupted current for substantial distribution loads.
• Four-pole configuration for simultaneous switching and isolation of four conductors.
• Withdrawable moving-part design supports convenient inspection, maintenance and replacement.
• High 50 kA short-time withstand current for 1 s.
• 105 kA peak short-circuit making capacity.
• Rated for operation at up to 690 V AC.
• AC-23A utilisation category supports demanding inductive-load switching applications.

Key Features

• ABB SACE Emax E1N/MS 1250 switch-disconnector moving part.
• 1250 A rated uninterrupted current.
• Four-pole construction.
• Withdrawable (W) moving part (MP) configuration.
• N short-circuit performance level.
• 690 V AC / 250 V DC rated operational voltage.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• 50 kA for 1 s rated short-time withstand current.
• 36 kA for 3 s rated short-time withstand current.
• 105 kA peak rated short-circuit making capacity.
• Designed for compatible SACE Emax withdrawable fixed parts.

Reliable Withdrawable Switching and Isolation

The ABB E1N/MS 1250 provides a dependable means of making, carrying and isolating high-current circuits without an integrated electronic overcurrent trip unit. Its 50 kA one-second short-time withstand rating and 105 kA peak making capacity support use in substantial distribution systems when suitable protective equipment is coordinated elsewhere in the installation.

As a withdrawable moving part, the E1N/MS 1250 can be separated from its corresponding fixed part for inspection, servicing or replacement. This architecture combines the established SACE Emax mechanical platform with improved maintainability, making the 1SDA058946R1 well suited to switchboards where dependable isolation and service accessibility are important.

Typical Applications

• Main low-voltage distribution switchboards.
• Industrial power distribution systems.
• Main and feeder switching applications.
• Four-pole electrical isolation.
• Motor and highly inductive load switching under AC-23A duty.
• Manufacturing and process plants.
• Commercial and infrastructure electrical installations.
• Withdrawable switchgear and power distribution centres.