Electronics

Digital Active High

Digital Active Low

Digital Logic Gates

AND

NAND

OR

NOR

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Pushbutton

Notes

SPST:  Single Pole Single Throw

SPDT:  Single Pole Double Throw

DPST:  Double Pole Single Throw

DPDT:  Double Pole Double Throw

 

Momentary-contact:  Press and hold to turn on, release to turn off.

Maintained-contact:  Press to turn on; press again to turn off.

 

Single Throw

NO (Normally Open):  Contacts are open when the switch is not actuated.

NC (Normally Closed):  Contacts are closed when switch is not actuated.

 

Multiple Throw

BM (Break-before-Make):  The moving contacts break an existing connection before making the new connection -- Nonshorting type.

MB (Make-before-Break):  The moving contacts make a new connection before breaking the existing connection -- Shorting type.

This page is for INFORMATIONAL PURPOSES ONLY.