Cisco Switch Selector
Most probably this equipment is electrical equipment like fan, TV etc. To flow current from a circuit it must require a close path loop. If switch is OFF, that means circuit is open and current cannot flow through the conductor and equipment is de-energise OFF state. To make it energise, we have to turn ON switch, it makes a complete circuit and close path. So, current can flow through the equipment and it can turn ON. In control system engineering, switches play an important role.
There are mainly two types of switches- mechanical switch and electrical switch. Mechanical switches require physical or manual contact with switch for operation. Electrical switches not require physical or manual contact, 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 throughs. Poles means the number of input circuit power circuit available to the switch.
Throws means the number of output circuit number of path in which current can flow available to the switch. In mechanical switch, two metal plates are touch each other to complete circuit for the current to flow and separate each other to open circuit for the current to interrupt. So, name of this switch is single pole single throw. This switch is simplest example of switch. Generally, this switch used in single loop, means circuit requires to control only one close path. Symbol of single pole single throw switch is as shown in figure-1a.
This switch is connected in series with the equipment, source or elements as shown in figure-1b. By using this switch, we can supply current or signal to two loops as shown in figure Sometimes this switch is known as selector switch. This switch is very similar to two SPST switches. Both switches are connected with single liver so, both switches operate at a single time. These switches used when we want to control two circuit for same time as shown in figure-3b.
Operation of this switch is similar to the two separate SPDT switches operate at a same time. In this switch, two terminal of input pole are connected with one set two of output throw-1 in position-1 of switch. If we change the position of switch, it will connect this input with second set of output terminal-2 as shown in figure-4b. Here as shown in example, let us assume that, in position-1 if motor is rotating in clockwise direction, if we change to position-2 motor will rotate in anti-clockwise direction.
Generally, this type of switch is used for change-over in circuit with common input terminal. Electrical switches are nothing but it is a semiconductor device. These switches are more useful because of their low cost, small size and reliability.Switches are an important part of most electronic circuits. Switches are mechanical devices with two or more leads or terminals that are internally connected to metal contacts which can be opened or closed by the person operating the switch. When the switch is in the On position, the contacts are brought together to complete the circuit so that current can flow.
When the contacts are together, the switch is closed. When the contacts are apart, the switch is open and current cannot flow. One way to categorize switches is by the movement a person uses to open or close the contacts. There are many different switch designs. The most common are. Slide switch: A slide switch has a knob that you can slide back and forth to open or close the contacts.
Toggle switch: A toggle switch has a lever that you flip up or down to open or close the contacts. Common household light switches are examples of toggle switches.
Rotary switch: A rotary switch has a knob that you turn to open and close the contacts. The switch in the base of many tabletop lamps is an example of a rotary switch. Rocker switch: A rocker switch has a seesaw action. You press one side of the switch down to close the contacts, and press the other side down to open the contacts.
Control Wiring - Switch Types | Toggle, Push Button, Selector Switch, Etc.
Knife switch: A knife switch is the kind of switch Igor throws in a Frankenstein movie to reanimate the creature. In a knife switch, the contacts are exposed for everyone to see. Pushbutton switch: A pushbutton switch is a switch that has a knob that you push to open or close the contacts. In some pushbutton switches, you push the switch once to open the contacts and then push again to close the contacts.
In other words, each time you push the switch, the contacts alternate between opened and closed. Other pushbutton switches are momentary contact switcheswhere contacts change from their default state only when the button is pressed and held down. The two types of momentary contact switches are. Normally open NO : In a normally open switch, the default state of the contacts is open. When you push the button, the contacts are closed.
When you release the button, the contacts open again. Thus, current flows only when you press and hold the button. Normally closed NC : In a normally closed switch, the default state of the contacts is closed. Thus, current flows until you press the button. When you press the button, the contacts are opened and current does not flow.
When you release the button, the contacts close again and current resumes. Types of Switches in Electronic Circuits.
About the Book Author Doug Lowe still has the electronics experimenter's kit his dad gave him when he was Quickly identify the right Cisco switch for your needs, whether you're looking for a new switch or upgrading an old one in your enterprise LAN or data center.
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Get resiliency, security, and more. Catalyst Series Switches are widely deployed campus backbone switches. They are optimized for Multigigabit Ethernet services to help you protect your network investment.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 of the device. A switch can perform two functions, namely fully ON by closing its contacts or fully OFF by opening its contacts. When the contacts of a switch are open, no power will be consumed by the load as shown in below figure. In some applications multi way switching is employed like building wiringin such cases two or more switches are interconnected to control an electrical load from more than one location.
Mechanical switches must be activated physically, by moving, pressing, releasing, or touching its contacts. Electronic switches do not require any physical contact in order to control a circuit. Mechanical switches can be classified into different types based on several factors such as method of actuation manual, limit and process switchesnumber of contacts single contact and multi contact switchesnumber of poles and throws SPST, DPDT, SPDT, etc.
Based on the number of poles and throws, switches are classified into following types. The pole represents the number of individual power circuits that can be switched. Most of the switches are designed have one, two or three poles and are designated as single pole, double pole and triple pole. The number of throws represents the number of states to which current can pass through the switch. Most of the switches are designed to have either one or two throws which are designated as single throw and double throw switches.
The electronic switches are generally called as solid state switches because there are no physical moving parts and hence absence of physical contacts. Most of the appliances are controlled by semiconductor switches such as motor drives and HVAC equipments. There are different types of solid state switches are available in today market with different sizes and ratings. A transistor either allows the current to pass or it blocks the current as similar to working of normal switch.
In switching circuits, transistor operates in cut-off mode for OFF or current blocking condition and in saturation mode for ON condition. The active region of the transistor is not used for switching applications.
When a small current flows though the base terminal supplied by a driving circuit connected between the base and emitterit causes to turns ON the collector-emitter path.
And it is turned OFF when the base current is removed and base voltage is reduced to a slight negative value. Even though it utilizes small base current, it is capable to carry much higher currents through the collector- emitter path. A diode can perform switching operations between its high and low state impedance states.Light switches date back to when John Henry Holmes invented the quick-break mechanism.
Even today, the quick break mechanism is used in some electric light switches. InWilliam J. Newton developed the quick-break mechanism and devised the first toggle light switch. The toggle light switch has since evolved and led to a few light switches according to the need and demand of the society. Some of the most recent innovations include the touch-sensitive switches, intelligent lamps that can be operated through a mobile app, remote-controlled light switches, and a light switch that can be controlled by a wave of the hand.
Related: Types of Lights. When you think about light switches, the first thing that likely comes to mind is a toggle switch.
Toggle light switches are the common light switch that just about everyone has in their homes. You flip the toggle switch up to turn your lights on and then flip it back down to turn them off. If you want to install lighting in a new room, then using a toggle light switch is probably going to be your preferred option.
There are some other switches that will offer better features than a standard toggle switch, but this will work nicely for any general lighting purposes. There are some toggle light switches that will come with special features, though. This one here is actually capable of interfacing with your smartphone.
You can set up timers to turn the light on at a specific time and can even simply activate it without having to get up from your seat. It even has full integration with Alexa, making it a truly convenient option. If you want something less technological, then you can purchase a standard toggle light switch instead. You will be able to find the normal toggle light switches at just about any hardware store that you can think of.
Push button light switches are probably the second most common light switch that you can make use of. They are really simple switches that will work excellently in your home. Sometimes they are wired to both the lighting and some type of an exhaust fan.
There are some variations among these push-button light switches, too. Some of them are designed so that when you press the button, it will stay recessed until you press it again. There are also models that have you press the button and it will return to a normal position. Which type of press button light switch you prefer will really come down to personal preference. Some people prefer the switches that stay recessed because it gives them a visual cue of what position or mode the light is currently in.
It can help you to realize that you need to change a bulb or fix some type of wiring issue. The push button light switch being shown off here is a nice and simple single-button model. It does have the convenient feature of having a blue LED light installed inside. It makes things really simple, so this is definitely a good light switch to buy. Click for price. Proximity light switches are very useful to set up in your home when you want to cut down on wasting energy.
These switches can turn a light on in your house when you are in a room. When no people are in the room any longer, the light switch will shut things off. Environmental concerns are on the minds of many people in modern times. Being able to cut down on energy consumption is a very appealing prospect.
You might wind up saving some minor amount of money on your monthly energy bills if you make use of this type of light switch. Unless you are a very wasteful person when it comes to energy, it is unlikely that you will see a substantial difference. Admittedly, this type of light switch is only going to appeal to certain people.An electrical switch is any device used to interrupt the flow of electrons in a circuit. Switches are essentially binary devices: they are either completely on "closed" or completely off "open".
There are many different types of switches, and we will explore some of these types in this chapter. Though it may seem strange to cover this elementary electrical topic at such a late stage in this book series, I do so because the chapters that follow explore an older realm of digital technology based on mechanical switch contacts rather than solid-state gate circuits, and a thorough understanding of switch types is necessary for the undertaking.
Learning the function of switch-based circuits at the same time that you learn about solid-state logic gates makes both topics easier to grasp, and sets the stage for an enhanced learning experience in Boolean algebra, the mathematics behind digital logic circuits.
The simplest type of switch is called a contact block where two electrical conductors are brought in contact with each other by the motion of an actuating mechanism.
Other switches are more complex, containing electronic circuits able to turn on or off depending on some physical stimulus such as light or magnetic field sensed. In any case, the final output of any switch will be at least a pair of wire-connection terminals that will either be connected together by the switch's internal contact mechanism "closed"or not connected together "open".
Toggle switches are actuated by a lever angled in one of two or more positions.
11 Different Types of Light Switches and Fixtures
The common light switch used in household wiring is an example of a toggle switch. Push-button switches are two-position devices actuated with a button that is pressed and released.
Most push-button switches have an internal spring mechanism returning the button to its "out," or "unpressed," position, for momentary operation. Some push-button switches will latch alternately on or off with every push of the button. Other push-button switches will stay in their "in," or "pressed," position until the button is pulled back out.
This last type of push-button switches usually have a mushroom-shaped button for easy push-pull action. Selector switches are actuated with a rotary knob or lever of some sort to select one of two or more positions.
Like the toggle switch, selector switches can either rest in any of their positions or contain spring-return mechanisms for momentary operation.
A joystick switch is actuated by a lever free to move in more than one axis of motion.
The circle-and-dot notation on the switch symbol represents the direction of joystick lever motion required to actuate the contact. Joystick hand switches are commonly used for crane and robot control. Some switches are specifically designed to be operated by the motion of a machine rather than by the hand of a human operator. As with hand switches, limit switches come in several varieties:.
These limit switches closely resemble rugged toggle or selector hand switches fitted with a lever pushed by the machine part. Often, the levers are tipped with a small roller bearing, preventing the lever from being worn off by repeated contact with the machine part. Proximity switches sense the approach of a metallic machine part either by a magnetic or high-frequency electromagnetic field. Simple proximity switches use a permanent magnet to actuate a sealed switch mechanism whenever the machine part gets close typically 1 inch or less.
More complex proximity switches work like a metal detector, energizing a coil of wire with a high-frequency current, and electronically monitoring the magnitude of that current. If a metallic part not necessarily magnetic gets close enough to the coil, the current will increase, and trip the monitoring circuit. The symbol shown here for the proximity switch is of the electronic variety, as indicated by the diamond-shaped box surrounding the switch.
A non-electronic proximity switch would use the same symbol as the lever-actuated limit switch. Another form of proximity switch is the optical switch, comprised of a light source and photocell. Machine position is detected by either the interruption or reflection of a light beam. Optical switches are also useful in safety applications, where beams of light can be used to detect personnel entry into a dangerous area.
In many industrial processes, it is necessary to monitor various physical quantities with switches. Such switches can be used to sound alarms, indicating that a process variable has exceeded normal parameters, or they can be used to shut down processes or equipment if those variables have reached dangerous or destructive levels. There are many different types of process switches:.Though it may seem strange to cover the elementary topic of electrical switches at such a late stage in this book series, I do so because the chapters that follow explore an older realm of digital technology based on mechanical switch contacts rather than solid-state gate circuits, and a thorough understanding of switch types is necessary for the undertaking.
Learning the function of switch-based circuits at the same time that you learn about solid-state logic gates makes both topics easier to grasp, and sets the stage for an enhanced learning experience in Boolean algebra, the mathematics behind digital logic circuits. An electrical switch is any device used to interrupt the flow of electrons in a circuit. There are many different types of switches, and we will explore some of these types in this chapter. The simplest type of switch is one where two electrical conductors are brought in contact with each other by the motion of an actuating mechanism.
Other switches are more complex, containing electronic circuits able to turn on or off depending on some physical stimulus such as light or magnetic field sensed.
Any switch designed to be operated by a person is generally called a hand switchand they are manufactured in several varieties:. Toggle switches are actuated by a lever angled in one of two or more positions.
The common light switch used in household wiring is an example of a toggle switch. Pushbutton switches are two-position devices actuated with a button that is pressed and released. Some pushbutton switches will latch alternately on or off with every push of the button. This last type of pushbutton switches usually have a mushroom-shaped button for easy push-pull action.
Selector switches are actuated with a rotary knob or lever of some sort to select one of two or more positions. Like the toggle switch, selector switches can either rest in any of their positions or contain spring-return mechanisms for momentary operation. A joystick switch is actuated by a lever free to move in more than one axis 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 notation on the switch symbol represents the direction of joystick lever motion required to actuate the contact. Joystick hand switches are commonly used for crane and robot control.
Some switches are specifically designed to be operated by the motion of a machine rather than by the hand of a human operator. These motion-operated switches are commonly called limit switchesbecause they are often used to limit the motion of a machine by turning off the actuating power to a component if it moves too far. As with hand switches, limit switches come in several varieties:. These limit switches closely resemble rugged toggle or selector hand switches fitted with a lever pushed by the machine part.
Often, the levers are tipped with a small roller bearing, preventing the lever from being worn off by repeated contact with the machine part. Proximity switches sense the approach of a metallic machine part either by a magnetic or high-frequency electromagnetic field. Simple proximity switches use a permanent magnet to actuate a sealed switch mechanism whenever the machine part gets close typically 1 inch or less.[Bangla] About Industrial Switches. Push Switch, Selector Switch, Emergency Switch. By-Amit Paul⚡⚡⚡