Motor disconnects are more than simple on-off devices to satisfy lockout-tagout requirements. They have become an integral part of the motor control circuit as disconnects increasingly offer control functions, such as auxiliary contact interface, added selector switches and push buttons.

Motor disconnects are more than simple on-off devices. They increasingly offer additional control functions, such as test-off-run switches. Motor disconnects can also pack multiple devices into one enclosure, saving space and cost while allowing you to address different application requirements. Here's a quick visual overview of what today's motor disconnects can offer.

Motor disconnects are more than simple on-off devices. They increasingly offer additional control functions, such as test-off-run switches. Motor disconnects can also pack multiple devices into one enclosure, saving space and cost while allowing you to address different application requirements. Here's a quick visual overview of what today's motor disconnects can offer.  

In the right applications, variable frequency drives (VFD) will improve the control and reduce the energy costs of your AC motor-driven equipment. To install a VFD safely, however, you may need to reconsider the type of motor disconnect you use. The traditional knife-blade style of disconnect, while compliant with the National Electrical Code (NEC), is not the best choice for modern VFD applications. The reasons why are both physical and electrical.