“Make”是“form A (normally open) contacts”的缩写，意

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“Break”是“form B (normally closed) contacts”的缩写

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“B”是“form B (normally closed) contacts”的缩写，意

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“A”是“form A (normally open) contacts”的缩写，意思

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“C”是“form C (break-before-make) contacts”的缩写，

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“D”是“form D (make-before-break) contacts”的缩写，

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“E”是“form E (break; make-before-make) contacts”的

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“F”是“form F (polar make; make) contacts”的缩写，意

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“G”是“form G (polar break; break) contacts”的缩写，

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“H”是“form H (break; break) contacts”的缩写，意思是

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