SK829070-E ABB VH550 Mechanical Interlock

Why Choose the ABB VH550 Mechanical Interlock?

The ABB VH550 is a heavy-duty mechanical interlock unit designed to mechanically interlock two compatible ABB contactors installed in a horizontal arrangement. Supplied under ABB order code SK829070-E, it forms part of ABB’s classic contactor accessory range for industrial controlgear and motor-control applications.

The VH550 provides a mechanical interlocking function that prevents both mechanically linked contactors from being closed simultaneously. This makes it particularly useful in reversing, changeover and other contactor arrangements where positive mechanical prevention of simultaneous operation is required.

Designed for two horizontally mounted contactors, the VH550 is compatible with selected ABB EH and EHDB contactors, including EH370, EH550 and EHDB520–EHDB650 configurations. Its substantial mechanical construction is designed for dependable operation alongside heavy-duty industrial contactors.

Key Advantages

• Heavy-duty mechanical interlock for ABB contactors.
• Prevents two mechanically linked contactors from closing simultaneously.
• Designed for two horizontally mounted contactors.
• Compatible with selected ABB EH and EHDB contactors.
• Suitable for reversing, changeover and interlocked contactor arrangements.
• Robust mechanical construction for demanding industrial control applications.

Key Features

• ABB VH550 mechanical interlock.
• ABB order code SK829070-E.
• Mechanical interlocking of two horizontally mounted contactors.
• Suitable for compatible contactors with AC or DC operating coils.
• Compatible with selected EH370 and EH550 contactor arrangements.
• Compatible with EHDB520–EHDB650 contactor arrangements.
• Purely mechanical interlocking action.
• Designed for industrial motor-control and switching systems.

Reliable Mechanical Interlocking for Industrial Contactors

Mechanical interlocks such as the ABB VH550 are used where two contactors must be prevented from operating simultaneously. The interlock mechanically links the contactors so that closing one contactor inhibits the closing movement of the other, providing a physical interlocking function independent of the electrical control logic.

This arrangement is commonly used in reversing motor starters, changeover systems and other industrial switching circuits. The VH550 is specifically designed for compatible horizontally mounted ABB EH and EHDB contactors, providing a robust solution for heavy-duty controlgear installations.

Typical Applications

• Reversing motor starter assemblies.
• Industrial changeover contactor systems.
• Forward and reverse motor-control circuits.
• Heavy-duty electrical control panels.
• Industrial machinery and automation systems.
• Maintenance and replacement of existing ABB EH and EHDB contactor assemblies.