1SDA073522R1 ABB E1.2N/MS 1250 4p WMP Switch Disconnector

Why Choose the ABB E1.2N/MS 1250 4p WMP Switch Disconnector?

The ABB E1.2N/MS 1250 4p WMP, order code 1SDA073522R1, is a four-pole withdrawable air switch disconnector from the ABB SACE Emax 2 range, designed for dependable switching and electrical isolation in low-voltage power distribution systems. Built on the compact E1.2 frame with N performance level, this /MS configuration provides a 1250 A rated uninterrupted current for industrial, commercial and infrastructure switchboards.

The E1.2N/MS combines its continuous-current capacity with a rated short-time withstand current of 50 kA for 1 s and 30 kA for 3 s. This gives the device robust withstand performance for demanding distribution systems while appropriately coordinated protective equipment elsewhere in the installation provides automatic overload and short-circuit protection.

This model is supplied as the withdrawable moving part (WMP) in a four-pole configuration. With a rated operational voltage of 690 V AC, AC-21 and AC-23 current ratings of 1250 A at 400 V, and a serviceable withdrawable architecture, the 1SDA073522R1 is a versatile solution for modern low-voltage switchboards.

Key Advantages

• 1250 A rated uninterrupted current for substantial low-voltage distribution loads.
• 50 kA short-time withstand current for 1 s for demanding switchboard applications.
• 30 kA short-time withstand current for 3 s provides additional withstand capability.
• Four-pole construction supports simultaneous switching and isolation across four conductors.
• Withdrawable moving-part design supports inspection, servicing and equipment replacement.
• 690 V AC rated operational voltage for industrial low-voltage networks.
• 1250 A AC-21 and AC-23 ratings at 400 V for demanding switching duties.
• Compact E1.2 frame combines high current capacity with space-efficient switchboard integration.

Key Features

• ABB SACE Emax 2 E1.2N/MS air switch disconnector.
• 1250 A rated uninterrupted current (Iu).
• Four-pole configuration.
• 50 kA rated short-time withstand current (Icw) for 1 s.
• 30 kA rated short-time withstand current (Icw) for 3 s.
• 690 V AC rated operational voltage (Ue).
• 1250 A rated permanent current at AC-21, 400 V.
• 1250 A rated permanent current at AC-23, 400 V.
• Withdrawable moving part (WMP) configuration.
• Bolt-connected main circuit interface.
• IP30 front-side protection.
• Interlockable construction for controlled switchboard operation.
• Optional motor drive and voltage release supported by the Emax 2 platform.

Reliable Withdrawable Isolation for Low-Voltage Distribution

ABB SACE Emax 2 /MS switch disconnectors are engineered for controlled switching and electrical isolation in low-voltage distribution systems. Unlike an automatic circuit breaker equipped with a protection trip unit, the /MS configuration performs the switching and isolation function while suitably coordinated protective equipment elsewhere in the installation provides the required automatic fault protection.

The withdrawable construction allows the E1.2N/MS moving part to be separated from the corresponding fixed portion of the switchboard, supporting inspection, maintenance and replacement. Combined with its 1250 A continuous-current rating and 50 kA 1-second short-time withstand capability, the 1SDA073522R1 provides dependable high-current isolation in a compact and serviceable Emax 2 architecture.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical distribution.
• Incoming and outgoing switching and isolation duties.
• Transformer secondary distribution systems.
• Generator and standby power installations.
• Manufacturing and process plant switchgear.
• Withdrawable switchboard assemblies requiring serviceable four-pole isolation.