1SBN030100R1000

The ABB VM5-1 Mechanical Interlock Unit is a contactor accessory designed to mechanically interlock two compatible contactors. Installed between the contactors, it blocks one contactor from closing while the other remains closed. This helps prevent simultaneous operation in switching arrangements that require the contactors to operate one at a time.

Identified by ABB part number 1SBN030100R1000, the VM5-1 is listed for compatible A9–A40 contactors. ABB’s catalogue specifies its use with horizontally mounted contactors. The required rail or mounting plate is not supplied with the unit, so confirm the installation method and contactor combination before purchase.

The VM5-1 provides mechanical interlocking. Any electrical interlocking or other circuit protection required for the application should be selected separately according to the system design. Ahmedabad Electric Corporation offers ABB switchgear and automation products and can assist with product availability and compatibility checks.