Offered in 20, 30, 60, and 100 A units, Square D MD50 pin-and-sleeve interlocked switch receptacle prevents process interruption by cutting power to motor if necessary while not affecting main circuit. UL 508-listed product employs IEC 60309-compliant technology that helps increase safety on plant floor by preventing mating of plug and power receptacle with different voltage and ampere ratings. Mechanical interlock forces operator to insert plug before power can be turned on.