1SDA073430R1 ABB E1.2N/MS 250 4p F F Switch-Disconnector

Why Choose the ABB E1.2N/MS 250 4p F F Switch-Disconnector?

The ABB E1.2N/MS 250 4p F F, order code 1SDA073430R1, is a SACE Emax 2 fixed air switch-disconnector designed for reliable switching and isolation in low-voltage electrical distribution systems. This E1.2N/MS version combines a 250 A rated uninterrupted current with a four-pole configuration for applications requiring simultaneous switching of all four conductors.

As an Emax 2 /MS switch-disconnector, the E1.2N/MS 250 is intended primarily for switching and isolation duties rather than the electronic overcurrent protection provided by Ekip-equipped Emax 2 circuit breakers. This makes it suitable for installations where fault and overload protection is coordinated elsewhere and a robust main isolation device is required.

This model uses fixed construction with front terminals and is designed for Emax 2 applications up to 690 V AC. Its E1.2N/MS performance level provides a rated short-time withstand current of 50 kA for 1 s, supporting dependable operation in industrial, commercial and infrastructure distribution assemblies.

Key Advantages

• 250 A rated uninterrupted current for low-voltage power-distribution applications.
• E1.2N/MS switch-disconnector configuration for dependable switching and circuit isolation.
• Four-pole construction supports simultaneous switching of three phases and neutral.
• Fixed installation provides a straightforward permanent switchboard solution.
• Front terminals simplify connection within compatible switchgear assemblies.
• 50 kA short-time withstand current for 1 s provides robust fault-current withstand capability.
• Designed for Emax 2 fixed switch-disconnector applications up to 690 V AC.

Key Features

• ABB SACE Emax 2 E1.2N/MS series.
• 250 A rated uninterrupted current.
• 4-pole configuration.
• Fixed installation.
• Front terminals.
• Switch-disconnector functionality for switching and isolation.
• 50 kA rated short-time withstand current for 1 s.
• Designed for fixed applications up to 690 V AC.
• Suitable for use as a main switch in compatible low-voltage distribution systems.
• Part of the modular ABB Emax 2 platform.

Reliable 250 A Four-Pole Switching and Isolation

The ABB SACE Emax 2 E1.2N/MS provides controlled switching and isolation for low-voltage electrical circuits. Its four-pole arrangement enables all four conductors to be switched by a single device, while its switch-disconnector design provides a dedicated isolation point where overcurrent and fault protection is coordinated through other suitable protective devices in the electrical system.

With a 250 A rated uninterrupted current and 50 kA for 1 s short-time withstand capability, the E1.2N/MS 250 combines the compact E1.2 frame with robust electrical performance. Fixed installation and front terminals make it particularly suitable for permanent low-voltage switchboard assemblies where straightforward connection and dependable isolation are required.

Typical Applications

• Main switching and isolation in low-voltage distribution boards.
• Four-pole three-phase and neutral distribution systems.
• Industrial power-distribution switchboards.
• Commercial and infrastructure electrical installations.
• Transformer secondary distribution assemblies.
• Switchgear where circuit protection is provided by coordinated protective devices elsewhere in the system.