1440546 is a Phoenix Contact female plug, part of the MSTB 2,5 series. It is a double-level terminal block, designed to make it easier to connect wiring and system components. The terminal block has several features, such as an SSI interface, push-in spring connection technology, an integrated lock, and a wide range of accessories for easy modularity. This terminal block is UL listed and CSA approved, making it suitable for use in a range of commercial and industrial applications.