a switch is a device which is designed
to interrupt the current flow in a
circuit in other words it can make or
break an electrical circuit every
electrical and electronics application
uses at least one switch to perform on
and off operation for the device so the
switches are the part of a control
system and without it control operation
cannot be achieved a switch can perform
two functions namely fully on by closing
its contact or fully off by opening its
contacts when the contours of a switcher
closed the switch creates the closed
path for current flow and hence loads
consume the power from source when the
contacts of a switcher open no power
will be consumed by the load there are
mainly two types of switches mechanical
switch and electrical switch mechanical
switches require physical or manual
contact with switch for operation a
trigger switch is not require physical
or manual contract it has ability to
perform operation electrical switches
operate under the action of
semiconductors mechanical switches
further classify into different types of
switches based on number of poles and
throws there are five types one single
pole single throw is PST - single pole
double throw
SPD t3 double pole single throw dps t4
double pole double throw dp/dt
five intermediate switch mechanical
switches can also be categories on the
basis of holding the current state there
are two types latch switch and momentary
switch the lats which holds its state
whether on or off until the new commands
initiated this switch and momentary
switch holds the state only when the
specific comment is presented only let's
switch and momentary switches are eight
types one
push-button switch to limit switch three
pressure switch for fruits which five
temperature switch six travel switch
seven rotary switch eight joystick
switch spst single pole single throw
that spst is a basic on or off switch
that is used to connect or break the
connection between two terminals the
power supply for the low circuit is
given by the switch the application of
spst switches light switched and it is
also called as a towel switch this type
of switch has one input and one output
SPDT single pole double throw the SPDT
switch is a three terminal switch one
terminal is used as input and remaining
two terminals are used as outputs it
joins a mutual terminal to one or the
other two terminals the application of
SPDT switch is mainly involved in a
three-way circuit to turn on or off a
light from two locations like from the
top and bottom for stairway DPA steam
double pole single throw the DP is to
switch consists of two poles that means
it includes two identical switches
located on side by side this switch is
operated by one single toggle which
means that two discrete circuits are
controlled at a time through one push DP
DT double pole double throw this switch
is equal to 2 is PDT switches it means
two separate circuits connecting two
inputs of each circuit to one of two
outputs the switch position controls the
number of wizened from the two contacts
each contact can be routed intermediates
which an intermediate switch is where
three points control the same circuit
this is a very versatile switch and can
be used for most lighting situation but
in reality it is more expensive so you
would normally only use it when needed
that is when you have three switches
controlling one light then the middle
one needs to be and intermediate
push-button switch a push-button switch
to mix
which allows electricity to flow between
its two contacts when held in when the
button is released the circuit is broken
this type of switch is also known as
normally open switch limits which limits
which are used for controlling machinery
as part of a control system as a safety
interlocks or to count object passing a
point a limit switch is an
electromechanical device that consists
of an actuator mechanically linked to a
set of contacts when an object comes
into contact with the actuator the
device operates the contacts to make or
break an electrical connection pressure
switch this type of switch consists of C
shaped I freedom according to pressure
the staff program is indicating pressure
these switches are used to sense
pressure of air water or oil in
industrial application this switch
operates when pressure of a system is
increase or decrease from set point
float switch a force which is a type of
level sensor a device used to detect the
level of liquid within a tank the switch
may be used to control a pump as an
indicator and alarm or to control other
devices temperature switch this type of
switches consists of temperature sensing
device like RTD and their most this
switch operates according to the value
of measured temperature travel switch
this type of switch is commonly used in
household application to on and off
electrical appliance it has a level by
which we can move up or down to on and
off appliance rotary switch this type of
switch is used to connect one line with
one of the many lines knob of multimeter
channel selector range selector metering
device band selector is communication
devices are the examples of this type of
switch this switch is same as single
pole multi throw switch but the
arrangement of this switch is different
joysticks which adjusts which is
actuated by a lever free to move in more
than one exists of motion one or more of
several switch contact mechanisms are
actuated depending on
which way the lever is pushed and
sometimes by how far it is pushed the
circle and dot rotation on the switch
symbol represents the direction of
joystick lever motion required to
actuate the contact joystick hence
wishes are commonly used for crane and
robot control dear sir
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