Switch Abbreviations

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N.C.: Normally Closed circuit

 

N.O.: Normally Open circuit

 

MBB: Make Before Break

 

BBM: Break Before Make

 

SPST: Single Pole Single Throw

 

SPDT: Single Pole Double Throw

 

DPST: Double Pole Single Throw

 

DPDT: Double Pole Double Throw

 

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“Pole” indicates the number of circuits that one switch can control for one operation of the switch. “Throw” indicates the number of contact points. NO and NC contac...

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