Reference
Switch Types
Switch Types
Type
Terminals Common Function
Features
Single Pole, Single Throw SPST
1P
1T
2
On/Off
• Opens or closes one circuit
1T 2T
Single Pole, Double Throw SPDT
• Controls two single-wire circuits • Commonly used in pairs • Sometimes called three-way switch
1P
3
On/Off/On or On/On
1P
1T 1T
Double Pole, Single Throw DPST
• Controls one double-wire circuit or two single wire circuits • Operates two items simultaneously
4
On/Off
2P
1T 2T 1T 2T
1P
Double Pole, Double Throw DPDT
• Controls two double-wire circuits • Operates two items simultaneously
6
On/Off/On or On/On
2P
• Automatically returns to rest position • Momentary = spring return switch • Also called Normally Closed circuit
Momentary - Normally On
–
On/(Off)
Rest Position ON
Depressed OFF
• Automatically returns to rest position • Momentary = spring return switch • Also called Normally Open circuit
Momentary - Normally Off
–
(On)/Off
Rest Position OFF
Depressed ON
Pg. E51
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