① chosen according to the working voltage electrical voltage selection, the rated voltage of the circuit where the system should be consistent with the nominal voltage, which allows the maximum operating voltage Umax where the loop should not be less than the maximum operating voltage Uy, namely Umax ≥ Uy.
② Press Working voltage electrical current selection should not be less than the rated current In the loop at all possible ways to run continuous operating current Ig, namely In ≥ Ig.
Power : 220V
To ensure high-voltage electrical Under normal operation, maintenance, short-circuit and over-voltage conditions secure, high-voltage electrical conditions are selected according to the following:
① normal operating conditions including voltage, current, frequency, mechanical load and other options;
② Press the short-circuit conditions, including short-time withstand current and peak withstand current, closing and breaking current and other options;
③ Press environmental conditions including temperature, humidity, altitude, earthquakes and other options;
④ Press the capacity to withstand over-voltage insulation level and other options, including;
⑤ according to the different characteristics of various types of high-voltage electrical switching operations, including performance, protection features fuse with, transformer load and accurate grading and other options.
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