The voltage ir on core adopts semienclosed insert model . the current element adopts two - stage compensation to have wide load property . the whole plasticenclosed voltage coil . can withstand instantaneous large voltage impulse . the double jewels bearing or the magnetic - propelled bearing can ensure long lifetime . the bipolar aluminium nickel cobalt damping magnet steels have high coercivity , stable magmetic property . the electric function is in accordance with iec521 international standard
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