The NSX mounting plate system for busbar simplifies the installation of NSX 100-250 circuit breaker. Power distribution is performed by a busbar. The mounting plate is fitted directly on the busbar, by snap-on-mounting. thus implementing mechanical and electrical connection. The busbar interaxis is 60 mm. This system offers numerous benefits as space saving in cabinets and easy connection. This system also offer fast, safe and reliable electrical and mechanical connection. This system also offer IP20 protection by using busbars and end covers. This system also offer easier maintenance and equipment flexibility and modularity.