ABB VEM4 Mechanical and Electrical Interlock for AF Series Contactors

The ABB VEM4 mechanical and electrical interlock is a specialized accessory designed to enhance the safety and functionality of AF09 to AF38 series contactors. By preventing the simultaneous activation of two contactors, this unit provides a reliable solution for motor reversing and changeover applications in industrial electrical systems. The integrated design allows for side-by-side mounting without increasing the overall width of the installation, making it an efficient choice for space-constrained control panels.

Advantages

The VEM4 interlock set offers significant improvements in installation efficiency and operational safety. By combining both mechanical and electrical interlocking in a single unit, it ensures that two contactors cannot be energized at the same time, effectively preventing short circuits. The inclusion of the VE4 electrical block with A2-A2 connection simplifies the wiring process, reducing the required cabling by up to 50% compared to traditional interlocking methods. This streamlined approach not only saves time during assembly but also minimizes the potential for wiring errors, contributing to a more robust and reliable control system.

Suitable for

• Motor reversing applications
• Changeover switching systems
• Industrial automation control panels
• Safety-critical electrical installations

When it may not be suitable

This interlock is specifically engineered for the ABB AF09 to AF38 and AFC09 to AFC38 series contactors. It is not compatible with contactors outside of these specified ranges or from other manufacturers. Furthermore, it should not be used in applications where the electrical connection diagram does not support the A2-A2 configuration required by the VE4 block.

Key specifications

• Compatible with AF09 to AF38 and AFC09 to AFC38 series contactors
• Includes mechanical interlock unit VM4 with two fixing clips
• Includes electrical interlock block VE4
• Width: 25 mm
• Depth: 31.6 mm
• Height: 43 mm

How to use

To install the VEM4, mount the mechanical interlock unit between the two contactors using the provided fixing clips. The VE4 electrical interlock block is then mounted on the front of the contactors. Ensure that the A2-A2 connection is strictly followed according to the electrical diagram to enable the built-in normally closed (N.C.) contacts. Once properly secured, the unit will automatically prevent the simultaneous closing of the contactors, providing the necessary electrical and mechanical protection.

What to consider before purchase

• Verify that your contactor model falls within the AF09 to AF38 or AFC09 to AFC38 range.
• Ensure there is sufficient space for the 25 mm width of the interlock unit.
• Confirm that your control circuit design supports the A2-A2 connection requirement.

Usage recommendations

Always verify that the power supply is disconnected before installing or servicing the interlock unit to ensure operator safety. Regularly inspect the mechanical and electrical connections to maintain optimal performance in your control system.