the surface of the printed circuit board to facilitate connection with and to protect the printed circuit board components in an exemplary embodiment of the invention a resistor circuit 33 with resistors 39 46 aligned in array format has each resistor extending upwards from the printed circuit board rating and option selection is accomplished by removing selected resistors 39 46 that connect with the microprocessor by means of rail electrical connections with pins 38 that extend from the microprocessor on the opposite side of the printed circuit board fig4 as described hereinbefore the resistor circuit 33 connects with the microprocessor 30 by means of the databus 25 fig1 such that the presence of selected ones of the resistors 39 46 is determined by the microprocessor allowing the circuits associated with the selected resistors to become activated customization of electronic trip unit 10 is achieved by removing selected ones of the resistors 39 46 fig3 using a transfer table 49 driven by a gear 50 and a drive train 51 under command of a controller 52 one such arrangement is a type grmtr servo motor obtained from pitman co the printed circuit board 34 is arranged edgewise on the top of the transfer table with the resistor array parallel with the travel direction of the transfer table as indicated a stepper motor 55 is programmed for removing specific one s of the resistors 39 46 depending upon the selected rating or functions the arbor 53 operatively connects with the stepper motor and terminates at the opposite end in a formed tool as indicated at 54 the removal of selected one s of the resistors is best understood by now referring to fig4 wherein the printed circuit board 34 fig2 is shown positioned on the.