The IC3600QSPA103B502B is a type of printed circuit board or PCB created for the Mark I-II series by General Electric or GE. This device is known as a potentiometer relay circuit board. The Mark I and Mark II were the first two (2) series made for the Mark series designed for gas turbine control. The Mark I and Mark II debuted in 1969 and 1973. These series and the others in the Mark line have been used in many different industries all around the world ever since.
The IC3600QSPA103B502B is a large printed circuit card/board or PCB with a variety of electronic components. Occupying much of the PCB is a collection of four (4) large rectangular components which are known as relays or contactors. These relays are mostly made of gold metal and contain grey plastic parts on either end. A large white label with black print is fixed to the top of each relay. Featured on this label are the part numbers CR-120G40B06FC and 68A997277C03. The voltage of the relays, which is twenty-eight (28) volts DC, is printed on the labels along with General Electric’s name and symbol. A collection of wires in red, yellow, and blue may be found connecting the relays to a long line of metal prongs. These prongs cover the entirety of the right edge of the IC3600QSPA103B502B. These are labeled with the numbers one (1) to fifty-one (51). Arranged at the top of the IC3600QSPA103B502B is a collection of resistors that are solid red or blue. Four (4) small diodes are lined up in a short row to the right of the resistors.