The driver circuit 11 of the first driver 17 receives power from a line terminal 32 formed on a side wall of the housing of the first driver 17. The driver circuit 11 outputs power to a load out terminal 31 also mounted on a side wall of the housing of the first driver 17. The line terminal 32 and the loadout terminal 31 can both be electrical connectors such as standard electrical connectors used for transmission of power.