Connection system for protection boards of a distribution system and rack incorporating said system

Solid state power controller (SSPC) board (protection board 13a) for secondary electrical power distribution in aircraft. The board is connecting the primary power supply (power line 20) to a powered device (device 8a). The board is provided with connector modules for input and output connections (1 and 2 respectively in fig 5, see also input 1a and output 2a) and a service connection 3. The service connection is connected to a motherboard. An additional modular connector (not shown) has power slots (7a), is partly attached to rack 22 and is interposed between the input connector (1a) and the power supply (power line 20, wiring area 21). To establish an input connection, the power tracks (1) of the input connector (1a) are inserted in the power slots (7a) of the additional modular connector. As the power supply can be common to multiple boards (13a, b) terminal block 19 and busbars 19a,19b branch out the electrical power intended for the boards. A centring pin on the protection board can be used for connector alignment.