The IsoBlock Q module was designed to isolate the voltage across cable segments of a superconducting magnet, as well as coils, half and full magnets. By placing multiple IsoBlock sensors along the length of a superconducting cable, a time-of-flight technique can be used to locate a quench origin. Also, Isoblock sensors can be placed across larger symmetrical segments of a magnet to detect when the magnet starts quenching from superconducting state.