1SCA022870R8400 ABB 250 A 4-Pole Side Operated Switch Fuse

Why Choose the ABB OS250BS04N2K Side Operated Switch Fuse?

The ABB OS250BS04N2K, product ID 1SCA022870R8400, is a robust 250 A four-pole side operated switch fuse designed for reliable switching, isolation and fuse protection in industrial and commercial low-voltage electrical systems. As part of the ABB OS Fuse Switches range, it combines dependable load switching with fuse-based overcurrent protection for demanding power distribution applications.

This side operated switch fuse uses the British Standard fuse system and is designed for B1–B3 fuse links. Its four-pole construction incorporates a switched fourth pole with a solid link on the right side, while the operating mechanism is positioned on the left side. A direct-mounted handle provides convenient local operation without requiring a separate door-mounted operating mechanism.

With a rated operational current of 250 A at up to 690 V AC, the OS250BS04N2K provides AC-23A operational power ratings of 145 kW at 400 V, 170 kW at 500 V and 250 kW at 690 V. Its base-mounted construction, 25 mm lug terminals and included direct-mounted handle make it a practical solution for industrial switchboards and distribution assemblies.

Key Advantages

• Heavy-duty 250 A side operated switch fuse for industrial power distribution.
• Four-pole configuration with a switched fourth pole and solid link.
• Left-side operating mechanism for the specified panel arrangement.
• Direct-mounted handle included for convenient local operation.
• Designed for British Standard B1–B3 fuse links.
• Base-mounted design with robust 25 mm lug terminals.
• Combines switching, electrical isolation and fuse protection within a single device.

Key Features

• ABB OS Fuse Switches series.
• 250 A rated operational current.
• Four-pole construction.
• Side operated configuration.
• Operating mechanism positioned on the left side.
• Direct-mounted handle supplied as standard.
• British Standard B1–B3 fuse compatibility.
• Fourth pole positioned on the right side.
• Fourth pole is switched with a solid link.
• Rated for AC-20 to AC-23A duties at up to 690 V AC.
• 145 kW AC-23A rating at 400 V.
• 170 kW AC-23A rating at 500 V.
• 250 kW AC-23A rating at 690 V.
• Top-in/bottom-out or bottom-in/top-out terminal orientation.

Reliable Switching and Fuse Protection

Switch fuses combine manual load switching and electrical isolation with the overcurrent and short-circuit protection provided by correctly selected fuse links. This enables downstream equipment and distribution circuits to be protected while providing a clearly defined means of isolation for operation, servicing and maintenance.

The ABB OS range is designed for industrial switchboards, distribution panels and machinery installations. The OS250BS04N2K combines a 250 A four-pole configuration with a left-side operating mechanism and direct-mounted handle, making it particularly suitable for assemblies requiring local side operation and dependable British Standard fuse protection.

Typical Applications

• Industrial low-voltage distribution boards.
• Electrical switchboards and control panels.
• Four-pole feeder isolation and fuse protection.
• Industrial machinery power supplies.
• Motor and equipment distribution circuits.
• Commercial and industrial power distribution systems.