motors as a prime mover the 3-phase ac motor in particular the squirrel-cage ... motors and in conjunction with overload relays to protect motors in the event of ... and verifiable normal switching duty ac-3 for squirrel-cage motors operating ... in the iec utilization categories e.g ac-3ac-4 the iec 60 947 standard states ... the iec utilization categories ac-3 and ac-4 are most often encountered in ... full running speed mixers elevators compressors agitators escalators pumps centrifuges ... motor current utilization category 100 ac-3 operating characteristics typical ... machines extreme switching duty ac-4 for squirrel-cage motors electrical ... motor current utilization category 100 ac-4 determination of the maximum number of ... hour type s/h 9000 6000 5000 4000 3000 ac-1 2 2 2 2 2 2 2 2 2 ac-3 1 1 1 1 1 1 1 1 ...
