Electronics - Voltage and Current - Discussion
Discussion Forum : Voltage and Current - General Questions (Q.No. 7)
7.
What type of switch is this?
Discussion:
62 comments Page 4 of 7.
Kowsalya said:
1 decade ago
What is push button? I want to explanation of spdt, spst, dpst.
Ragunath said:
1 decade ago
@Kowsalya.
The "push-button" has been utilized in calculators, push-button telephones, kitchen appliances, and various other mechanical and electronic devices, home and commercial.
In industrial and commercial applications, push buttons can be linked together by a mechanical linkage so that the act of pushing one button causes the other button to be released. In this way, a stop button can "force" a start button to be released. This method of linkage is used in simple manual operations in which the machine or process have no electrical circuits for control.
Pushbuttons are often color-coded to associate them with their function so that the operator will not push the wrong button in error. Commonly used colors are red for stopping the machine or process and green for starting the machine or process.
Red pushbuttons can also have large heads (called mushroom heads) for easy operation and to facilitate the stopping of a machine. These pushbuttons are called emergency stop buttons and are mandated by the electrical code in many jurisdictions for increased safety. This large mushroom shape can also be found in buttons for use with operators who need to wear gloves for their work and could not actuate a regular flush-mounted push button. As an aid for operators and users in industrial or commercial applications, a pilot light is commonly added to draw the attention of the user and to provide feedback if the button is pushed. Typically this light is included into the center of the pushbutton and a lens replaces the pushbutton hard center disk. The source of the energy to illuminate the light is not directly tied to the contacts on the back of the pushbutton but to the action the pushbutton controls. In this way a start button when pushed will cause the process or machine operation to be started and a secondary contact designed into the operation or process will close to turn on the pilot light and signify the action of pushing the button caused the resultant process or action to start.
The "push-button" has been utilized in calculators, push-button telephones, kitchen appliances, and various other mechanical and electronic devices, home and commercial.
In industrial and commercial applications, push buttons can be linked together by a mechanical linkage so that the act of pushing one button causes the other button to be released. In this way, a stop button can "force" a start button to be released. This method of linkage is used in simple manual operations in which the machine or process have no electrical circuits for control.
Pushbuttons are often color-coded to associate them with their function so that the operator will not push the wrong button in error. Commonly used colors are red for stopping the machine or process and green for starting the machine or process.
Red pushbuttons can also have large heads (called mushroom heads) for easy operation and to facilitate the stopping of a machine. These pushbuttons are called emergency stop buttons and are mandated by the electrical code in many jurisdictions for increased safety. This large mushroom shape can also be found in buttons for use with operators who need to wear gloves for their work and could not actuate a regular flush-mounted push button. As an aid for operators and users in industrial or commercial applications, a pilot light is commonly added to draw the attention of the user and to provide feedback if the button is pushed. Typically this light is included into the center of the pushbutton and a lens replaces the pushbutton hard center disk. The source of the energy to illuminate the light is not directly tied to the contacts on the back of the pushbutton but to the action the pushbutton controls. In this way a start button when pushed will cause the process or machine operation to be started and a secondary contact designed into the operation or process will close to turn on the pilot light and signify the action of pushing the button caused the resultant process or action to start.
Ragunath said:
1 decade ago
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.
DPST Double pole, single throw Double pole Double pole Equivalent to two SPST switches controlled by a single mechanism
SPDT Single pole, double throw Two-way Three-way A simple changeover switch: C (COM, Common) is connected to L1 or to L2.
DPST Double pole, single throw Double pole Double pole Equivalent to two SPST switches controlled by a single mechanism
Sundareswaran said:
1 decade ago
What is the symbol of both among option?
Muhammad Bilal Attari said:
1 decade ago
SPDT Is Correct Answer.
SPDT Stand For:
S = Single.
P = Pole.
D = Double.
T = Through.
SPDT Stand For:
S = Single.
P = Pole.
D = Double.
T = Through.
Usman said:
1 decade ago
What is switch open or closed?
Santosh said:
1 decade ago
@Usman : you can take a example of a relay where three terminals are there. Com, NO, NC. When common connects with NO it is open switch.
And when com connects with NC it is closed switch.
And when com connects with NC it is closed switch.
Priya said:
1 decade ago
Answer is SPDT.
The basic theory is the moving contact of the switch is known as "Pole" & non-moving contact is known as "throw". So, from symbol we come to know that there is a single pole and double throw. Hence it is SPDT.
The basic theory is the moving contact of the switch is known as "Pole" & non-moving contact is known as "throw". So, from symbol we come to know that there is a single pole and double throw. Hence it is SPDT.
Kranthi said:
1 decade ago
Push button means momentary contact.
Akshat said:
1 decade ago
What is the difference between single pole and double pole?
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