Intermittent duty cycle is repeated short-time working means contactor closing and opening times are too short to make contacts in the working system to reach thermal equilibrium. mcb circuit breaker Obviously the main factors affecting the life time of such contacts is the cumulative number of operations. The main parameters describing intermittent duty cycle is powered sustained rate and operating frequency, power continued to rate the standard value of 15%, 25%, 40%, 60% of four, the operating frequency is divided into eight (1,3,12 , 120,300,600,1200) electric energy meter, each level figures mean that the number of hourly operating frequency of the contactor rated. Typically operating frequency of 100 times / h or more devices are heavy duty equipment, machine tools typical equipment (vehicles, drilling, milling, grinding), lifting equipment, mill equipment, centrifuges, coking industry, coke oven car is heavy intermittent periodic duty tasks. Operating frequency Inverter Power Supply over 600 times / h belongs to special equipment heavy duty equipment, such equipment is mainly some devices similar to my company unloading port lifting equipment and machine rolling on.
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