MERSEN FUSE SHAFT SWITCHFUSE 12X12X325MM SFB325

Why Choose the Mersen SFB325 Switch-Fuse Operating Shaft?

The Mersen SFB325 is a heavy-duty switch-fuse operating shaft designed for compatible Mersen UL 98 fusible disconnect switch assemblies. Featuring a robust 12 × 12 mm square profile and an overall length of 325 mm, it provides the mechanical connection between an enclosure-mounted operating handle and the switch mechanism installed inside the electrical panel.

The SFB325 enables a compatible fusible disconnect switch to be operated safely from outside the enclosure. Its substantial square-section construction provides secure engagement with the external handle and internal switch mechanism, supporting dependable transfer of rotational movement during switching and electrical isolation.

With its extended 325 mm shaft length, the SFB325 is particularly suitable for deep industrial switchboards and control cabinets where the disconnect switch is positioned further from the enclosure door. It is supplied as an individual shaft accessory and must be combined with the appropriate Mersen fusible disconnect switch and operating handle.

Key Advantages

• Purpose-designed operating shaft for Mersen UL 98 fusible disconnect switches.
• 12 × 12 mm square profile for reliable mechanical engagement.
• 325 mm overall length for deep electrical enclosures.
• Enables external operation of an internally mounted switch-fuse.
• Supports compatible enclosure door-interlocking arrangements.
• Heavy-duty construction for demanding industrial switchgear applications.

Key Features

• Mersen switch-fuse operating accessory.
• Square switch operating shaft.
• 12 × 12 mm shaft section.
• 325 mm overall shaft length.
• Designed for selected Mersen UL 98 fusible disconnect switches.
• Connects an external operating handle to the internal switch mechanism.
• Suitable for deep switchboard and control-panel installations.
• Supplied as an individual shaft accessory.

Reliable External Operation for Deep Switchgear Enclosures

The Mersen SFB325 transfers rotational movement from an externally mounted operating handle to a compatible fusible disconnect switch located inside an electrical enclosure. This allows industrial equipment and distribution circuits to be switched or isolated without opening the panel during normal operation.

Its extended 325 mm length accommodates deep enclosures and flexible internal switch positions. When installed with compatible Mersen components, the shaft can also form part of a door-interlocking arrangement that helps restrict access to the enclosure while the disconnect switch remains in the ON position.

Typical Applications

• Deep industrial switchboards.
• UL 98 fusible disconnect switch assemblies.
• Motor control centres.
• Industrial power distribution equipment.
• OEM machinery and process systems.
• Panel-mounted electrical isolation systems.