Specifications

S.P.S.T, (Single Pole/Single Throw)
A two terminal switch which opens or closes one circuit.
S.P.D.T. (Single Pole/Double Throw)
A three terminal switch that controls two single-wire circuits. Permits
only one circuit to be energized at a time
D.P.S.T. (Double Pole/Single Throw)
A four terminal switch that controls one double wire circuit or two
single wire circuits.
D.P.D.T. (Double Pole/Double Throw)
A six terminal switch that controls two double wire circuits
permitting only one circuit to be energized at a time, or four
single wire circuits permitting only two circuits to be energized
at a time.
ELECTRICAL TERMS
AMPERE Electrical unit indicating rate of flow of electricity through
a circuit.
CIRCUIT Path taken by electrical current flowing through conductor
from one terminal source of supply to another.
CURRENT The movement of electrons through a conductor measured
in amperes.
DOUBLE POL£ A switch that operates simultaneously in two separate
electric circuits.
DOUBLE THROW A switch that alternately completes a circuit at
either end of its extreme positions.
DOUBLE POLE/SINGLE THROW D.P.S.T -A switch that
has four terminals and is used to connect or disconnect two pairs of
terminals simultaneously.
DOUBLE POLE DOUBLE/THROW D.P.D.T A switch that has six
terminals and is used to connect one pair of terminals to either of the other
two pairs.
INDUCTIVE LOAD Initial amps needed to engage a circuit and/or a
load which allows a momentary flow of current when a circuit is open.
{Devices that create inductive loads are typically motor coils and
solenoids.)
LAMP LOAD Light bulb current expressed in amps at a rated voltage.
MONENTARY Momentary action is obtained by holding switch in
position with pressure. Upon release the switch returns to the previous
position.
REVERSING Reversing action is obtained by reversing the polarity of
a switch with jumper wires or blades to change the rotation of a motor.
Typical applications are winches, plows, radio antennas and fuel selector
valves.
SINGLE POLE A switch that opens, closes, or changes connection in a
single conductor of an electrical circuit to a common contact.
SINGLE THROW A switch that opens, closes or completes a circuit at
only one of the extreme positions of its actuator.
SINGLE POLE/SINGLE THROW S.P.S.T. - A two terminal switch
which opens or closes one circuit.
SINGLE POLE/DOUBLE THROW S.P.D.T. - A three terminal
switch for connecting one terminal to either of two other terminals.
VOLT The unit that measures the potential difference in electrical force
or "pressure" between two points on a circuit.
WATT The unit of power that indicates the rate at which a device
converts electric current to another form of energy, either heat or motion.
23
Two Positions On-Off
(common) (common) (common)
LOAD
RET
(COMMON) SOURCE
ON - OFF (ON) - OFF
ON - ( OFF)
(ON) = MOMENTARY (OFF) = MOMENTARY
Two Position On-On
(Common)
(Common)
(Common)
ON - ON
Three Position On-off-On
ON - OFF - ON (ON) - OFF - (ON)
(ON) = MONEMTARY
LOAD #1
RET #1
(COMMON) SOURCE
Two Positions On-Off
One double wire circuit
Two Positions On-Off
Two single wire circuits.
LOAD #1
LOAD #2
LOAD #2
RET #2
RET #2
RET #2
(COMMON) SOURCE #1
(COMMON) SOURCE #2
LOAD
(COMMON) RET
(COMMON) SOURCE
(COMMON)
ON - OFF ON - OFF
(ON) - OFF (ON) - OFF
(ON) = MOMENTARY
LOAD #1
LOAD #2
LOAD #4
LOAD #3
RET #1
(COMMON) SOURCE #2
(COMMON) SOURCE #1
RET #3
RET #4
RET #2
(COMMON)
SERVICE TIP
 Replacement switch must have the same or higher rating as
original switch.
 Unplug circuit or turn off power at electrical panel.
 Re
move wires from old switch one-at-a-time and attach to
new switch in same manner, or follow wiring diagram.
 F
or Screw Terminals - Twist stranded wire together. Loop
wire clockwise around screw . Tighten securely.
 For Blade Terminals - Use Female push-on terminals. Crimp
tightly on stranded wire. Make sure you have a snug fit.
 Turn on power
LOAD #2
LOAD #1
(COMMON) SOURCE
(COMMON) RET
THREE POSITION On-Off-On
(Common)
(Common)
ON- OFF- ON
ON- OFF- ON
(Common) (Common)
(ON)- OFF- ON (ON)-OFF-OM (ON)- OFF- (ON) (ON)-OFF-(ON)
(ON) = MOMENTARY
(Common)
(Common)
TWO POSITION
On-On
(Common) (Common)
ON - ON ON - ON