Modular electrical power system

A power receptacle adapted to be secured to a power rail, the power receptacle comprising:

• a front face with a three pronged electrical socket;
• a structural arm including three electrical contacts, the structural arm including an inner face and an outer face, with two of the three electrical contacts disposed on one of the inner and outer face, and the other one of the three electrical contact disposed on the other one of the inner and outer face, each of the three electrical contacts electrically coupled to the electrical socket, the structural arm configured to, when the power receptacle is engaged with the power rail, slot into a channel of the power rail;
• and
• at least one protrusion configured to move between extended and retracted positions, and when in the extended position configured to structurally engage with the power rail.

A modular ground fault circuit interrupter (GFCI) module that is adapted to be connected to a power rail that supplies power to one or more electrical sockets, the modular GFCI module comprising:

• a housing that includes a front face and a second face that is transverse to the front face, the housing including circuitry for a ground fault circuit interrupter;
• at least one button disposed in the front face of the housing;
• and
• three terminals that are each configured to be electrically coupled to a corresponding electrical conductor of a power rail, wherein the three terminals are disposed along the second face of the housing.