切换电流是指继电器在开路和闭合触点时能可靠处理的最大电流。
Switched current is the maximum current that can be handled reliably while opening and closing contacts.
当触点闭合时，这些器件则被短路，因此它们的效果只有在开关开路时才能看到。
When the contact is closed, these are shorted, so their effect is only seen when the switch is open.
如果气隙太小，当触点开路时就会形成电弧，并且电流继续流通。
If the gap is too small, an arc may develop when the contacts open and current continues to flow.
如果气隙太小，当触点开路时就会形成电弧，并且电流继续流通。
If the gap is too small, an arc may develop when the contacts open and current continues to flow.
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