Modular multilevel electronic cabinet

A modular electronic cabinet having a plurality of cabinet sections located one atop the other, each said cabinet section comprising:

• a substantially enclosed main chamber including a front wall, a back wall, a pair of side walls, and top and bottom walls;
• a chimney defined by said back wall and a second wall located outside said chamber and spaced from said back wall;
• at least one control circuit module including a plurality of circuit components and a plurality of heat fins, said circuit components including at least one heat-producing element which is thermally coupled to said heat fins, each of said control circuit modules being coupled to said back wall at a respective location on said back wall with said circuit components located inside said chamber and said heat fins located inside said chimney;
• an air intake opening formed in said front wall and an air exhaust opening formed in said back wall, the relative location of said air intake opening, said air exhaust opening and said circuit components being such that cool air enters said chamber through said air intake opening, passes over said circuit components and exits said chamber through said air exhaust opening by natural convection as the air in said chamber is heated by said at least one heat-producing element;
• said chimney having a chimney air intake opening located below said heat fins and a chimney exhaust opening located above said heat fins so as to permit cooling air to flow through said chimney due to natural convection once said heat fins are heated by said at least one heat-producing element;
• at least one circuit breaker located in said chamber in front of said control circuit module and adjacent said front wall;
• and
• a circuit breaker bracket enclosing said at least one circuit breaker.

An electronic cabinet, comprising:

• a main chamber including a front wall and a back wall;
• at least one control circuit module including a plurality o circuit components and a plurality of heat fins, said circuit components including at least one heat-producing element which is thermally coupled to said heat fins, each of said circuit control modules being coupled to said back wall at a respective location on said back wall with said circuit components located inside said chamber and said heat fins located outside said chamber and to the rear of said back wall;
• an air intake opening formed in said front wall and an air exhaust opening formed in said back wall, the relative location of said air intake opening, said air exhaust opening and said circuit components being such that cool air enters said chamber through said air intake opening, passes over said circuit components and exits said chamber through said air exhaust opening by natural connection as the air in said chamber is heated by said at least one heat-producing element, said air exhaust opening being located above said heat fins so that air heated by said heat fins will rise past said air exhaust opening and cause additional air flow through said chamber;
• further including a plurality of sets of circuit breakers, said sets being equal in number to the number of said control circuit modules, each said set of circuit breakers being located in said chamber in front of and adjacent to a respective one of said control circuit modules such that each control circuit module has a respective set of circuit breakers associated therewith.