Without touching, 2 halves of clutch transmit torque using field generated by opposed multipole permanent magnets. Upon overload, clutch slips to prevent damage to motor or gearbox. Disc-type Model MDC transmits 17-265 lb-in. on 0.125-1.14 in. shafts; cylinder-type Model MSV, 440-8,850 lb-in. on 0.75-2.5 in. shafts.