Undervoltage release from the trip coil and control unit; undervoltage release action is divided into two kinds of instantaneous action and delay action; under voltage delay time regular sub 0.5s, 1s, 2s, 3s four. 3s special specifications for the above process until the 15s, through consultation with the factory by the user, the delay accuracy of ± 10%; 1 / 2 delay time, the main circuit power supply voltage is restored to 85% Ue and more, open circuit breakers continue
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