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Electronics specification and abbreviation
Expansion
of
abbreviation
British
mains
wiring
name
American
electrical
wiring
name
Description
Symbol
SPST
Single pole, single throw
One-way
Two-way
A simple on-off switch: The two terminals are either connected together or disconnected from each other. An example is a light switch.
SPDT
Single pole, double throw
Two-way
Three-way
A simple changeover switch: C (COM, Common) is connected to L1 or to L2.
SPCO
SPTT, c.o.
Single pole changeover
or
Single pole, centre off
or
Single Pole, Triple Throw
Similar to
SPDT
. Some suppliers use
SPCO/SPTT
for switches with a stable off position in the centre and
SPDT
for those without.
DPST
Double pole, single throw
Double pole
Double pole
Equivalent to two
SPST
switches controlled by a single mechanism
DPDT
Double pole, double throw
Equivalent to two
SPDT
switches controlled by a single mechanism.
DPCO
Double pole changeover
or
Double pole, centre off
Equivalent to
DPDT
. Some suppliers use
DPCO
for switches with a stable off position in the centre and
DPDT
for those without.
Intermediate switch
Four-way switch
DPDT
switch internally wired for polarity-reversal applications: only four rather than six wires are brought outside the switch housing.