Power Transfer Switches

TNT Standby Power is independently owned – making us agile, our power Transfer Switches is finding solutions. Whether your concern is business, farm, or personal you need dependability and TNT Standby Power is committed to work with you to find the right solutions that will give you this peace of mind. An easy-to-use mechanical slide interlock ensures that only one source is powering the emergency circuits, and prevents duplication of energy sourcing.

No required extension cords means less mess and fuss on installation and during use, providing a high level of safety and comfort. Contractor-friendly features make installations quick and easy, which saves time and money. 24-hour technical support, 7 days a week means backup power protection has minimal to no downtime. All products come with competitive warranty protection, which saves money on repairs. Green Automatic Transfer Switches EGSU Series Eaton’s Green ATS intelligently balances the electrical load in your home. Featuring a truly active load-management system, it maximizes the power output of your generator, reducing ongoing fuel consumption, emissions, and installation costs. EGSX Standard Automatic Transfer Switches Eaton’s EGSX ATS provides a safe and efficient means of transferring power.

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Featuring load-shedding capabilities and a installation friendly relay interface, EGSX Series offers the most reliable solution for your basic backup power needs. Manual Transfer Switches Used with standby and portable generators, Eaton’s manual transfer switches provide circuit breakers to monitor and allow switching of power to the generator, when utility power fails. This exit includes all air-cooled generators, liquid-cooled generators, portable generators and all generator specific accessories. Enter the characters you see below Sorry, we just need to make sure you’re not a robot. Over 50 Years of Power Generation Expertise. Sizing Tools, Product Information, Case Studies and More. Upgradeable Transfer Switch goes beyond what other manual transfer switches can do.

It makes upgrading from a portable generator to automatic standby power simple and affordable. Our service-entrance rated transfer switches include a 200 Amp utility main. Designed to mount on the outside of a house or building next to the utility meter, it connects to the load center indoors via subfeed lugs. Instead of connecting just a few circuits, this transfer switch allows you to feed generator power to your entire load center and manually turn off selected loads up to the capacity of the generator. Service Entrance Rated in USA only. Select-circuit transfer switches allow you to choose 6 to 16 select household circuits to power during an outage. If your needs change and later you choose to power more, your installer can easily expand the transfer switch by just adding more circuit breakers.

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Model 6376 enclosure designed for surface mount only. Ideal for switching a service or subpanel from utility to generator power. These economical, code-compliant, single-load transfer switches provide a safe way to feed generator power to a home, office, garage or farm building where the entire circuitry in a main panel or subpanel must be powered by a generator during a power outage. Compact, all-steel design isolates the generator from the utility with manual switching action. Our 15 Amp, single-circuit manual transfer switch allows you to safely deliver power to a furnace during a power outage.

It’s ideal for use with smaller generators. When the power goes out, simply plug a standard grounded extension cord into the power outlet on your generator and into the built-in plug on the transfer switch. UL Listed for US and Canada. This 30 Amp transfer switch can be mounted next to the existing load center to power a single circuit such as a water heater, well pump or small air conditioner during a power outage. Its NEMA 3R corrosion resistant aluminum enclosure has a hinged cover for added protection from the elements.

Teledyne Relays offers a comprehensive product line designed to meet a broad range of applications for RF, microwave, wireless, high-speed digital, instrumentation, semiconductor test, heating and lighting, motor control, commercial aviation, military and space applications. Specifically designed for large healthcare and mission-critical applications,with built-in metering,communications and advanced diagnostics. Provides highly reliable and flexible source switching for essential healthcare equipment and business critical applications, including make-before break switching. Rugged construction and flexible configurations for large commercial and industrial applications. Provides reliable, easy-to-operate source switching for small frame commercial and light industrial standby power applications. Built for light industrial and commercial critical applications requiring the dependability and ease of operation found in a power contactor switch.

You are being redirected Javascript is required. Please enable javascript before you are allowed to see this page. Over 50 Years of Power Generation Expertise. Sizing Tools, Product Information, Case Studies and More. Our RPC Series units feature a formidable array of security and authentication features, plus alarm and monitoring functions to track conditions at remote sites. 48V DC power switches and dry contact alarm input solutions.

All company and product names or logos mentioned herein are trademarks of their respective companies. Your shopping cart is currently empty. Jump to navigation Jump to search “Toggle button” redirects here. For the GUI widget, see Cycle button. This article needs additional citations for verification. By analogy with the devices that select one or more possible paths for electric currents, devices that route information in a computer network are also called “switches” – these are usually more complicated than simple electromechanical toggles or pushbutton devices, and operate without direct human interaction. Top, left to right: circuit breaker, mercury switch, wafer switch, DIP switch, surface mount switch, reed switch.

The most familiar form of switch is a manually operated electromechanical device with one or more sets of electrical contacts, which are connected to external circuits. A switch may be directly manipulated by a human as a control signal to a system, such as a computer keyboard button, or to control power flow in a circuit, such as a light switch. Automatically operated switches can be used to control the motions of machines, for example, to indicate that a garage door has reached its full open position or that a machine tool is in a position to accept another workpiece. An ideal switch would have no voltage drop when closed, and would have no limits on voltage or current rating. It would have zero rise time and fall time during state changes, and would change state without “bouncing” between on and off positions. The ideal switch is often used in circuit analysis as it greatly simplifies the system of equations to be solved, but this can lead to a less accurate solution. Theoretical treatment of the effects of non-ideal properties is required in the design of large networks of switches, as for example used in telephone exchanges.

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A toggle switch in the “on” position. Sometimes the contacts are plated with noble metals. They may be designed to wipe against each other to clean off any contamination. Nonmetallic conductors, such as conductive plastic, are sometimes used. Here the switch is shown in the open position. In electronics, switches are classified according to the arrangement of their contacts. A pair of contacts is said to be “closed” when current can flow from one to the other.

When the contacts are separated by an insulating air gap, they are said to be “open”, and no current can flow between them at normal voltages. The terms pole and throw are also used to describe switch contact variations. The number of “poles” is the number of electrically separate switches which are controlled by a single physical actuator. For example, a “2-pole” switch has two separate, parallel sets of contacts that open and close in unison via the same mechanism. The number of “throws” is the number of separate wiring path choices other than “open” that the switch can adopt for each pole. A switch with both types of contact is called a changeover switch or double-throw switch.

A simple on-off switch: The two terminals are either connected together or disconnected from each other. An example is a light switch. An example is a pushbutton switch. SPTT for switches with a stable off position in the centre and SPDT for those without.

Equivalent to two SPST switches controlled by a single mechanism. Equivalent to two SPDT switches controlled by a single mechanism. Some suppliers use DPCO for switches with a stable center position and DPDT for those without. DPCO switch with a center position can be “off” in the center, not connected to either L1 or L2, or “on”, connected to both L1 and L2 at the same time.

The positions of such switches are commonly referenced as “on-off-on” and “on-on-on” respectively. DPDT switch internally wired for polarity-reversal applications: only four rather than six wires are brought outside the switch housing. In the rest of this article the terms SPST, SPDT and intermediate will be used to avoid the ambiguity. Snapshot of switch bounce on an oscilloscope.

The switch bounces between on and off several times before settling. Switch and relay contacts are usually made of springy metals. When the contacts strike together, their momentum and elasticity act together to cause them to bounce apart one or more times before making steady contact. The result is a rapidly pulsed electric current instead of a clean transition from zero to full current.

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The effects of contact bounce can be eliminated by use of mercury-wetted contacts, but these are now infrequently used because of the hazard of mercury release. Alternatively, contact circuit voltages can be low-pass filtered to reduce or eliminate multiple pulses from appearing. By analogy, the term “debounce” has arisen in the software development industry to describe rate-limiting or throttling the frequency of a method’s execution. When the power being switched is sufficiently large, the electron flow across opening switch contacts is sufficient to ionize the air molecules across the tiny gap between the contacts as the switch is opened, forming a gas plasma, also known as an electric arc. Where the voltage is sufficiently high, an arc can also form as the switch is closed and the contacts approach.

If the voltage potential is sufficient to exceed the breakdown voltage of the air separating the contacts, an arc forms which is sustained until the switch closes completely and the switch surfaces make contact. In either case, the standard method for minimizing arc formation and preventing contact damage is to use a fast-moving switch mechanism, typically using a spring-operated tipping-point mechanism to assure quick motion of switch contacts, regardless of the speed at which the switch control is operated by the user. As the power being switched increases, other methods are used to minimize or prevent arc formation. A plasma is hot and will rise due to convection air currents.

The arc can be quenched with a series of non-conductive blades spanning the distance between switch contacts, and as the arc rises, its length increases as it forms ridges rising into the spaces between the blades, until the arc is too long to stay sustained and is extinguished. For example, the switch contacts may operate in a vacuum, immersed in mineral oil, or in sulfur hexafluoride. Manufacturers may rate switches with lower voltage or current rating when used in DC circuits. When a switch is designed to switch significant power, the transitional state of the switch as well as the ability to withstand continuous operating currents must be considered. For this reason, power switches intended to interrupt a load current have spring mechanisms to make sure the transition between on and off is as short as possible regardless of the speed at which the user moves the rocker.

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Power switches usually come in two types. Dual-action switches incorporate both of these features. Switches for inductive loads must be rated to handle these cases. A switch designed for an incandescent lamp load can withstand this inrush current.

Wetting current is the minimum current needing to flow through a mechanical switch while it is operated to break through any film of oxidation that may have been deposited on the switch contacts. A switch normally maintains its set position once operated. A biased switch contains a mechanism that springs it into another position when released by an operator. The momentary push-button switch is a type of biased switch. Any number of switching elements may be stacked in this manner, by using a longer shaft and additional spacing standoffs between each switching element. A rotary switch operates with a twisting motion of the operating handle with at least two positions.

Other positions may have a detent to hold the position when released. A rotary switch may have multiple levels or “decks” in order to allow it to control multiple circuits. One form of rotary switch consists of a spindle or “rotor” that has a contact arm or “spoke” which projects from its surface like a cam. It has an array of terminals, arranged in a circle around the rotor, each of which serves as a contact for the “spoke” through which any one of a number of different electrical circuits can be connected to the rotor. The switch is layered to allow the use of multiple poles, each layer is equivalent to one pole. Other types use a cam mechanism to operate multiple independent sets of contacts.

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Rotary switches were used as channel selectors on television receivers until the early 1970s, as range selectors on electrical metering equipment, as band selectors on multi-band radios and other similar purposes. In industry, rotary switches are used for control of measuring instruments, switchgear, or in control circuits. Bank of toggle switches on a Data General Nova minicomputer front panel. A toggle switch is a class of electrical switches that are manually actuated by a mechanical lever, handle, or rocking mechanism. Toggle switches are available in many different styles and sizes, and are used in numerous applications.

Many are designed to provide the simultaneous actuation of multiple sets of electrical contacts, or the control of large amounts of electric current or mains voltages. The word “toggle” is a reference to a kind of mechanism or joint consisting of two arms, which are almost in line with each other, connected with an elbow-like pivot. However, the phrase “toggle switch” is applied to a switch with a short handle and a positive snap-action, whether it actually contains a toggle mechanism or not. Similarly, a switch where a definitive click is heard, is called a “positive on-off switch”. In some contexts, particularly computing, a toggle switch, or the action of toggling, is understood in the different sense of a mechanical or software switch that alternates between two states each time it is activated, regardless of mechanical construction.

The mercury switch consists of a drop of mercury inside a glass bulb with two or more contacts. The two contacts pass through the glass, and are connected by the mercury when the bulb is tilted to make the mercury roll on to them. This type of switch performs much better than the ball tilt switch, as the liquid metal connection is unaffected by dirt, debris and oxidation, it wets the contacts ensuring a very low resistance bounce-free connection, and movement and vibration do not produce a poor contact. These types can be used for precision works. A high-voltage disconnect switch used in an electrical substation. Such switches are used mostly to isolate circuits, and usually cannot break load current. High-voltage switches are available for the highest transmission voltages, up to 1 million volts.

This switch is gang-operated so that all three phases are interrupted at the same time. Knife switches consist of a flat metal blade, hinged at one end, with an insulating handle for operation, and a fixed contact. When the switch is closed, current flows through the hinged pivot and blade and through the fixed contact. Such switches are usually not enclosed. The knife and contacts are typically formed of copper, steel, or brass, depending on the application.

Knife switches are made in many sizes from miniature switches to large devices used to carry thousands of amperes. In electrical transmission and distribution, gang-operated switches are used in circuits up to the highest voltages. The disadvantages of the knife switch are the slow opening speed and the proximity of the operator to exposed live parts. Metal-enclosed safety disconnect switches are used for isolation of circuits in industrial power distribution. Sometimes spring-loaded auxiliary blades are fitted which momentarily carry the full current during opening, then quickly part to rapidly extinguish the arc. A footswitch is a rugged switch which is operated by foot pressure.

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An example of use is in the control of a machine tool, allowing the operator to have both hands free to manipulate the workpiece. The foot control of an electric guitar is also a footswitch. A DPDT switch has six connections, but since polarity reversal is a very common usage of DPDT switches, some variations of the DPDT switch are internally wired specifically for polarity reversal. These crossover switches only have four terminals rather than six.

Two of the terminals are inputs and two are outputs. When connected to a battery or other DC source, the 4-way switch selects from either normal or reversed polarity. In building wiring, light switches are installed at convenient locations to control lighting and occasionally other circuits. By use of multiple-pole switches, multiway switching control of a lamp can be obtained from two or more places, such as the ends of a corridor or stairwell. A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used.

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The analogue switch uses two MOSFET transistors in a transmission gate arrangement as a switch that works much like a relay, with some advantages and several limitations compared to an electromechanical relay. Many people use metonymy to call a variety of devices “switches” that conceptually connect or disconnect signals and communication paths between electrical devices, analogous to the way mechanical switches connect and disconnect paths for electrons to flow between two conductors. The American Heritage Dictionary, College Edition. RF Switch Archived 2011-04-23 at the Wayback Machine.

Engineer’s Relay Handbook, 5th edition, Chapter 1. Archived from the original on 2017-07-05. Debouncing Javascript Methods” Archived 2013-04-01 at the Wayback Machine. Archived from the original on December 3, 2013.