An electrical distribution system has a wiring module and a switch module. The wiring module is configured to mount within an electrical box and has a wiring side, a functional side, terminals accessible from the wiring side and breakaways disposed between pairs of the terminals. The switch module is configured to removable install in the wiring module proximate the functional side. The switch module has contacts that configure the switch module as a type comprising one of a single-pole switch, a three-way switch and a four-way switch. The electrical function of wires routed to the wiring module terminals and the gap or link status of the wiring module breakaways determines the wiring module configuration and a corresponding switch module type.