1SDA073438R1 ABB E1.2N/MS 1250 4p F F Switch Disconnector

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

The ABB E1.2N/MS 1250 4p F F, order code 1SDA073438R1, is a high-performance four-pole air switch disconnector from the ABB Emax 2 family, designed to provide reliable isolation and switching of low-voltage electrical circuits. Derived from ABB Emax 2 air circuit breaker technology, the E1.2N/MS combines robust construction with dependable isolation performance for industrial and commercial power distribution systems.

The E1.2N/MS is designed as a switch disconnector in accordance with IEC 60947-3. Unlike an automatic circuit breaker, the /MS version does not incorporate a protection trip unit; instead, it provides switching and isolation functionality, with an open-contact isolation distance designed to safely separate downstream equipment from the electrical supply.

With a rated uninterrupted current of 1250 A, four-pole configuration and short-time withstand current of 50 kA for 1 s, this fixed Emax 2 switch disconnector is suitable for demanding low-voltage distribution applications. Its 690 V AC rated operational voltage and AC-23A utilisation category make it suitable for switching circuits and loads in industrial installations.

Key Advantages

• High-performance 1250 A air switch disconnector for low-voltage distribution.
• Four-pole configuration for switching and isolation of multi-pole circuits.
• 50 kA short-time withstand current for 1 s for demanding installations.
• Fixed-mounted Emax 2 construction for permanent switchboard installation.
• Designed for isolation in accordance with IEC 60947-3.
• Shares the proven mechanical platform and accessory ecosystem of ABB Emax 2 equipment.

Key Features

• ABB Emax 2 E1.2N/MS series.
• 1250 A rated uninterrupted current.
• 4-pole configuration.
• 690 V AC rated operational voltage.
• 1000 V AC rated insulation voltage.
• 50 kA Icw for 1 s.
• 30 kA Icw for 3 s.
• AC-23A utilisation category.
• Fixed switchboard installation.
• Switch-disconnector design without an automatic protection trip unit.

Reliable Switching and Isolation for Power Distribution

ABB Emax 2 /MS switch disconnectors are designed to provide dependable switching and isolation in low-voltage power distribution systems. When the device is open, the separation of the main contacts provides the isolation required to electrically separate downstream circuits and equipment for operational control and maintenance procedures.

Based on the Emax 2 platform, the E1.2N/MS offers the mechanical robustness and installation flexibility expected from ABB low-voltage power distribution equipment. Its high current capacity and short-time withstand performance make it particularly well suited to main distribution boards, industrial switchboards and other installations requiring reliable high-current isolation.

Typical Applications

• Low-voltage main distribution switchboards.
• Industrial power distribution systems.
• Commercial and infrastructure electrical installations.
• Power isolation and sectionalising circuits.
• Motor control and industrial distribution assemblies.
• OEM switchgear and panel-building applications.