Abstract: In a power board, network transformers are disposed horizontally to reduce their height, network buses are disposed above the network transformers and a protector breaker and take-off breakers are disposed at the front of the power board in electric chambers and connected to the network buses. This arrangement places the two types of breakers and the electric chambers within the range of height accessible by an operator's hand to permit him to manually handle these breakers, thereby improving ease of handling of the power board.

Abstract: A switchboard assembly comprises a plurality of circuit breaker compartments each having plural-phase power supply side disconnecting parts and load side disconnecting parts disposed thereinside, a plurality of conductor compartments having plural-phase power supply buses disposed thereinside, and a plurality of circuit breakers each having plural-phase circuit breaking parts accommodated in each of the circuit breaker compartments. In the switchboard assembly, the plural-phase circuit breaking parts are disposed in the depthwise direction of the circuit breaker compartments, and each of the conductor compartments is disposed between the opposing ones of the circuit breaker compartments so as to reduce the overall size of the switchboard assembly.

Abstract: In a power board, network transformers are disposed horizontally to reduce their height, network buses are disposed above the network transformers and a protector breaker and take-off breakers are disposed at the front of the power board in electric chambers and connected to the network buses. This arrangement places the two types of breakers and the electric chambers within the range of height accessible by an operators hand to permit him to manually handle these breakers, thereby improving ease of handling of the power board.