Power-bus-bars used to connect PISA-B modules electrically, distribute 24 V supply voltage of PISA-B modules, one fuse module preferred in the middle for better current distribution, permissible current of power-bus-bars is 32 A, fuse modules can be lined up on DIN rail without spacing, power-bus-bars can be plugged in from front of PISA-B module, length of 102 mm suitable to connect two modules, 155 mm suitable to connect three modules, longer rail can be cut to connect more than three modules together.