Jump to page content

Keyboard glossary

1A
Single Pole Single Throw Normally Open
1B
Single Pole Single Throw Normally Closed
2A
Double Pole Single Throw Normally Open
A/W
(On PCBs from Alps USA and Hi-Tek) Artwork (confirmed from a keyboard where it was written out in full)
DPDT
Double Pole Double Throw
DPST
Double Pole Single Throw
Form A
Single Pole Single Throw Normally Open (also written 1A, especially by Cherry) or simply Normally Open
Form B
Single Pole Single Throw Normally Closed (also written 1B, especially by Cherry) or simply Normally Closed
NC
Normally Closed
NO
Normally Open
PWB
(On PCBs from Alps USA and Hi-Tek) Likely “Printed Wiring Board”
SPDT
Single Pole Double Throw
SPST
Single Pole Single Throw