VEM4 Mechanical and electrical contactor interlocking device 1SBN030111R1000

Mechanical and electrical interlock for ABB contactors

The VEM4 interlock is a safety device designed to work with ABB AF series contactors (AF09…AF16 / AF26 ... AF38). Its main task is to prevent the simultaneous switching on of two contactors, which increases the safety and reliability of the installation. The interlock combines mechanical and electrical functions, providing comprehensive protection.

Construction and application

The VEM4 interlock consists of a mechanical interlock unit VM4 and an electrical interlock VE4, which work together. Installation is carried out between the contactors, and the electrical connection is made via A2-A2 terminals. The use of the VEM4 interlock is particularly important in reversing circuits, where it is necessary to exclude the possibility of a short circuit resulting from the simultaneous switching on of contactors in opposite directions.

Functionality and benefits

• Short-circuit protection: The interlock prevents accidental or unauthorized simultaneous switching on of contactors, protecting the installation from damage caused by a short circuit.
• Compatibility with various contactor models: The VEM4 interlock is compatible with a wide range of ABB AF series contactors, providing flexibility in design and installation modernization.
• Mechanical and electrical integration: The combination of mechanical and electrical interlocks provides a double layer of protection, increasing system reliability.
• Easy installation: The interlock has been designed with simplicity of installation and connection in mind, which translates into saving time and installation costs.
• Built-in auxiliary contacts: The interlock is equipped with two NC (normally closed) auxiliary contacts, which can be used to signal the status of the interlock or for other control purposes.
• Wiring cost savings: The use of the VEM4 kit allows for reducing wiring costs thanks to the integrated solution of mechanical and electrical interlock.

The VEM4 interlock is an integral part of safety systems in industrial and building installations, ensuring safe and reliable operation of equipment. This is particularly important in applications requiring high availability and minimizing the risk of failure.