Power and control system arrangement for transport refrigeration unit

A power and control system arrangement for a transport refrigeration unit adapted for use on a refrigerated transport container:

• a forwardly-open box having a rear, top, bottom and side walls;
• a hard-wired electrically passive assembly of a plurality of electrical terminal strips, including high voltage and low voltage terminals thereon, and high voltage and low voltage plug-in receptacles, mounted at said rear wall of said box, and wiring interconnecting said strips and receptacles;
• a unitary, interface module including high voltage and low voltage plugs on its rear face arranged to register with and being received by said high voltage and low voltage receptacles, respectively, said interface module carrying a plurality of electrically operable elements including contactor means and transformer means, and having a forward-facing low voltage plug-in receptacle;
• a front module including low voltage plugs on its rear face arranged to register with and being received by said low voltage receptacle means, said front module carrying a plurality of electrically operable elements associated with control functions of said transport unit;
• a detachable front cover closing the front of said box, said front cover carrying low voltage control switch means mounted on the cover and accessible from the front of said cover;
• wiring means including a detachable plug at at least one end thereof interconnecting said control switch means with said front module;
• means supporting said interface module and said front module in said box;
• means releasably securing said modules in fixed relation in said box;
• said arrangement thereby permitting the separation of said cover and low voltage control switch means, said low voltage front module, and said interface module, from said box and from each other and thus permitting their individual replacement.