Modular connectors are provided that have a modular receptacle connector assembly matable with a modular plug connector assembly for connecting AC or DC power connectors and electrical signals including board-to-board and wire-to-board connection. Provided is a “pass through” modular component to facilitate connection and disconnection of only the power supply for service without disconnecting the entire system. The wire connector also may load to the main housing thus obviating the need for a panel mount. Also provided is a one-unit modular connector system with either a coplanar or a right-angle design. Furthermore, multiple AC and/or DC power supplies can be provided that utilize minimum board space.