Siemens VBLK4-290355 Variable Depth Linkage Kit

Siemens VBLK4-290355 Variable Depth Linkage Kit is a panel-mounted switch accessory that provides an adjustable, depth-tuning linkage for 400–600 A Siemens switches, enabling consistent actuation across enclosures with different depths. The kit supports enclosure depths from 9.0 inches to 19.0 inches, allowing the operating handle to align correctly with the switch mechanism in installations ranging from shallow to deep panels. It is associated with Siemens VB-series panel-mounted switches (examples include VBFS361 and VBH2 configurations), serving as the linkage between the actuator and the switch to preserve geometry and clearance. The part number 290355 identifies this variable-depth linkage kit in Siemens' accessory lineup, with VBLK4 representing the 400–600 A variant. This accessory emphasizes mechanical compatibility and depth adaptability rather than electrical ratings, making it suitable for retrofit or new-panel installations where precise handle operation must be maintained across varying enclosure depths.