... switching angle (Q开关的) 开关角 switching arc 开关电弧；切换电弧 switching boundary 开关边界 ...
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如果切换电流太高，造成的温度升高和接触电弧将会劣化继电器并缩短接触寿命。
If the switched current is too high, the resulting temperature increase and contact arcing will degrade the relay and shorten the contact life.
电弧：高压切换产生的RFI(射频干扰)可能会干扰高速逻辑电路。
Arcing: The RFI (radio frequency interference) generated by high voltage switching may disrupt high speed logic circuits.
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