The heart of the alarm interface/isolation bay design consisting of diode sets, relays, terminal strips and lamps which are housed in a framework intended to be located in the power board line.

A printed board on which one or more printed board assemblies may be assembled and connected.

Also called a Back Plane. A relatively large Printed Circuit Board on which modules, connectors, subassemblies or other Printed Circuit Boards are mounted and interconnections made by means of traces on the board.

the main circuit board for a computer

The main printed circuit board in an electronic device, particularly a computer, which contains sockets that accept additional boards ("daughter-boards"). In a PC, the motherboard contains the bus, the microprocessor and chips used for controlling any built-in peripherals.