The Timing Relay (OEM Part No. 3217929906) is an electrical spare part compatible with Epiroc underground mining equipment, including M4C, Simba H1354 and SIMBA H1254 models. Manufactured with electronic components and plastic housing, it functions as a time delay control and circuit switching component in the machine electrical system. The timing relay provides accurate timing control, supports electrical sequence management, and helps maintain stable equipment performance. Designed for demanding mining environments, this replacement electrical component offers reliable operation, excellent durability, and long service life for underground drilling equipment maintenance and repair.