Abstract: This control board has buses stored in a bus chamber extending in the vertical direction with respect to a floor surface inside a housing and power is supplied to stored devices from the buses. The control board includes an inlet which is provided on the bus chamber and through which cooling air is taken in, a device inlet provided on the stored devices and opposed to a bus chamber outlet provided on the bus chamber, a device outlet provided on the front side of the stored devices, and a door portion outlet provided on a door on the front side and opposed to the device outlet.

Abstract: This control board has buses stored in a bus chamber extending in the vertical direction with respect to a floor surface inside a housing and power is supplied to stored devices from the buses. The control board includes an inlet which is provided on the bus chamber and through which cooling air is taken in, a device inlet provided on the stored devices and opposed to a bus chamber outlet provided on the bus chamber, a device outlet provided on the front side of the stored devices, and a door portion outlet provided on a door on the front side and opposed to the device outlet.

Abstract: There is adopted a shape in which the portions, at the central side of a distribution board, of left and right unit bases on which respective breakers are mounted can be arranged in a staggered manner, so that there is realized a structure in which units can be horizontally arranged while the units share a central vertical bus-line. Alternatively, two insertion-type breakers are horizontally arranged on one and the same unit base and wiring is performed from a contactor provided on the unit base to the primary-side terminal of each of the breakers, so that the left and right breakers share the central vertical bus-line.

Abstract: There is adopted a shape in which the portions, at the central side of a distribution board, of left and right unit bases on which respective breakers are mounted can be arranged in a staggered manner, so that there is realized a structure in which units can be horizontally arranged while the units share a central vertical bus-line. Alternatively, two insertion-type breakers are horizontally arranged on one and the same unit base and wiring is performed from a contactor provided on the unit base to the primary-side terminal of each of the breakers, so that the left and right breakers share the central vertical bus-line.