1SDA073544R1 ABB E4.2N/MS 4000 4p WMP Switch Disconnector

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

The ABB E4.2N/MS 4000 4p WMP, order code 1SDA073544R1, is a high-current four-pole withdrawable air switch disconnector from the ABB SACE Emax 2 range. Built on the E4.2 frame with N performance level, it provides a substantial 4000 A rated uninterrupted current for demanding industrial, commercial and infrastructure low-voltage distribution systems.

The E4.2N/MS provides a rated short-time withstand current of 66 kA, giving the switch disconnector robust withstand capability for high-current power distribution applications. As an /MS switch-disconnector configuration, it is intended for switching and isolation duties, with appropriately coordinated protective equipment elsewhere in the installation providing automatic overload and short-circuit protection.

This version is supplied as the withdrawable moving part (WMP) in a four-pole configuration. With a maximum rated operational voltage of 690 V AC, 4000 A AC-21 and AC-23 ratings at 400 V, and a withdrawable architecture, the 1SDA073544R1 combines high-current performance with convenient switchboard serviceability.

Key Advantages

• High-capacity 4000 A rated uninterrupted current for major low-voltage distribution systems.
• 66 kA rated short-time withstand current for demanding electrical installations.
• Four-pole construction for comprehensive switching and isolation duties.
• Withdrawable moving-part design supports inspection, maintenance and equipment servicing.
• 690 V AC maximum rated operational voltage for industrial low-voltage networks.
• 4000 A AC-21 and AC-23 ratings at 400 V for demanding switching duties.
• IP30 front-side protection for the installed device.
• Part of the proven ABB SACE Emax 2 platform for high-current power distribution.

Key Features

• ABB SACE Emax 2 E4.2N/MS air switch disconnector.
• 4000 A rated uninterrupted current (Iu).
• Four-pole configuration.
• 66 kA rated short-time withstand current (Icw).
• 690 V AC maximum rated operational voltage (Ue).
• 1000 V AC rated insulation voltage (Ui).
• 4000 A rated permanent current at AC-21, 400 V.
• 4000 A rated permanent current at AC-23, 400 V.
• Withdrawable moving part (WMP) configuration.
• Bolt-connected main circuit interface.
• IP30 front-side degree of protection.
• Main switch function supported.
• Interlockable construction for controlled switchboard operation.
• Optional motor drive and voltage release supported.

Reliable Withdrawable Isolation for High-Current Distribution

ABB SACE Emax 2 /MS switch disconnectors provide controlled switching and electrical isolation within low-voltage power distribution systems. The E4.2N/MS configuration is designed as a main switching device and combines the Emax 2 mechanical platform with the electrical characteristics required for high-current switch-disconnector applications.

The withdrawable architecture allows the E4.2N/MS moving part to be used with the corresponding fixed portion of an Emax 2 withdrawable assembly, supporting inspection, servicing and equipment replacement. Combined with its 4000 A continuous-current rating and 66 kA short-time withstand capability, the 1SDA073544R1 is particularly suited to major switchboards where high current capacity, robust withstand performance and serviceable isolation are required.

Typical Applications

• Main low-voltage distribution switchboards.
• Large industrial power distribution systems.
• High-current incoming and outgoing isolation duties.
• Transformer secondary distribution systems.
• Generator and standby power installations.
• Data centres and critical infrastructure.
• Manufacturing and process plant switchgear.
• Withdrawable high-current distribution assemblies.