A Printed Circuit Board Assembly. It forms part of a Residual Current Device (RCD) module. The function of the sensing board is to detect a change in current and signal to the main PCB to activate disconnection when a residual current above the threshold (10 or 30 mA) is detected. It includes passive and active electronic components for signal conditioning, voltage regulation, and control triggering. Made from FR4 substrate and is 1.6 mm thick.

GIR 1 and 6 HSEN to Heading 8538 Text to code 8538, 8538 90, 8538 9091.