Abstract: Apparatus and method are provided for releasably connecting to a base or assembly a box or the like such as an electrical module. Opposite mutually parallel sides of the box are each provided with a pair of projections having distal heads wider than their exposed shafts. The base or assembly is provided with a pair of parallel plates or angle irons sufficiently separated to accommodate the box and each provided with a pair of openings positioned and configured to receive and retain one of the projections. Preferably, each such opening has a right angle bend. For mounting, the box is placed on the base or assembly between the two plates or angle brackets such that each of the projections enters one of the openings. A right angle bend in the opening permits the opening to releasably retain that projection. At least one of the openings on each side is provided with a latch and a bail configured to releasably engage such a projection when the projection is disposed in the opening.