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Best Automatic Transfer Switch Manufacturers of 2022

Looking for the best ATS manufacturers, you can rely on? In this post, we’ve compiled a list of the Best Automatic Transfer Switch companies from across the world, along with some of their premium transfer switches, for your business. The different ATS product kinds and how they work are discussed in great detail in this reference. Continue to read!
Automatic transfer switches are a reliable resource for sending meaningful load connections.
There is a transfer of power between the primary power source and the backup power source. Data centers, businesses, and other facilities that need to operate continuously employ alternative energy sources. They utilize it for generators or backup utilities when the primary source is unavailable.
Best Automatic Transfer Switch Manufacturers of 2022

Automatic Transfer Switch Market Overview

With the help of an automatic transfer switch, the electrical load can be switched between two power sources automatically. When a utility line goes down, it is utilized in industrial, commercial, and residential buildings to transition from utility lines to backup power generators. Market growth for automatic transfer switches is anticipated to increase by USD 248.77 mn between 2021 and 2026. Additionally, according to Technavio, the market’s growth momentum will pick up at a CAGR of 6.75% throughout the projection period.

List of Automatic Transfer Switch Manufacturers in 2022

Here are top Automatic Transfer Switch Manufacturers that can be relied on:

ABB Automatic Transfer Switch

ABB offers automatic transfer switches such as ZTX T-series and ZTS T-series switches, as well as TruONE ATS. Intuitive transfer switch producer for docks, data centers, airports, and industrial facilities. Available in a current range of 160 to 1,600 A. Double throw, a mechanically interlocked contactor mechanism, electrical operation, and mechanical holding are among the features. There are also manual transfer switches available. Services include lifecycle management, engineering, consulting, installation, upkeep, replacement, and training. Serves the pulp and paper, aluminium, cement, automotive, chemical, data center, marine, metal, food, beverage, mining, power generation or distribution, automation, printing, water, wind, and solar industries.

Homepage: https://global.abb/group/en
About: https://global.abb/group/en/about
Products: https://new.abb.com/offerings
ATS: https://new.abb.com/low-voltage/products/switches/automatic-transfer-switches

Product Features
Company NameFound YearCountryCEO
1988Zürich, SwitzerlandBjorn Rosengren

Scott's ATS

Scott’s Emergency Lighting & Power Generation, Inc. is a supplier of transfer switches for public buildings, hospitals, manufacturing companies, universities, municipalities, retail establishments, and homes. Additionally, services for battery testing and charging, field service troubleshooting, diagnostics, repair, and preventative maintenance are offered.

Homepage: https://www.selpg.com/
Services: https://www.selpg.com/services
Generators: https://www.selpg.com/generators
Inverters: https://www.selpg.com/inverters

Product Features
Company NameFound YearCountryCEO
Scott’s Emergency Lighting & Power Generation, Inc.1971Bensalem, PennsylvaniaWayne Scott, Jr

Solar Biz ATS

Solar Biz Inc. is a distributor of dual, manual, and automatic generator transfer switches. Includes options for ground box terminals and neutral busbars. Distributing equipment for renewable energy sources, such as solar panels, inverters, power centers, solar charge controllers, batteries, monitors, system controllers, enclosures, circuit protectors, generators, hydro and wind products, water pumps and filters, barbecues, heaters, and other appliances. Applications both on and off the grid can use the products.

Homepage: https://www.thesolarbiz.com/
About: https://www.thesolarbiz.com/about-us/our-story.html
Products: https://www.thesolarbiz.com/our-products/solar-panel.html
Cummins Automatic Transfer Switch: https://www.thesolarbiz.com/cummins-ra100-se-100a-3r-automatic-transfer-switch.html

Product Features
Company NameFound YearCountryCEO
Solar Biz Inc.1969Silver City, New MexicoTom Duffy

TVW Automatic Transfer Switch

TVW Electrical Supplies is a supplier of automatic transfer switches. When the utility power fails, automated transfer switches are utilized to switch the power automatically to the generator. With standby and portable generators, automatic transfer switches are used.

Homepage: https://www.tvwdecatur.com/
About: https://www.tvwdecatur.com/about-us/
Products: https://www.tvwdecatur.com/electrical-products/
Contact: https://www.tvwdecatur.com/contact-us/

Product Features
Company NameFound YearCountryCEO
TVW Electrical Supplies1986North AlabamaKent Lawrence


CAMSO is a producer of automatic transfer switches. Their automatic power transfer switches offer high arc-quenching performance, dependable mechanical interlock, and fast transfer rates. They provide the PC-level W Series, which includes the W2 and WN3 models. A two-stage automatic transfer switch is the W-2. The button immediately switches power from one source to another after receiving a switching signal, passing through an OFF position in the middle. The current range is 20A–500A.
Homepage: https://www.camsco.com.tw/
About: https://www.camsco.com.tw/aboutus.htm
Automatic Transfer Switches: https://www.camsco.com.tw/automatic-transfer-switch.htm

Product Features
Company NameFound YearCountryCEO
CAMSO Electric Co Ltd.1979TaiwanPierre Marcouiller

Emergency Transfer Switch

Suppliers of automatic transfer switches and ATS controls, including programmable microcomputer control panels (PMCP) and mini-controllers, are designed, manufactured, and installed. Low voltage (directly between 120 and 600 volts) and medium voltage (2K to 15 kV) features of the PMCP include:
– Accurate RMS 3-phase voltage sensing
– Programmable transfer schemes
– Soft loads with control inputs
– Delayed transitions with programmable centre-off delays
– Load addition/shed
– Load disconnect
The microcontroller manages breaker pair transfer systems and solenoid-operated automated transfer switches.
Homepage: https://etccontrols.com/
About: https://etccontrols.com/emergency-transfercontrols-about-/
Services: https://etccontrols.com/services/emergencytransfercontrols-transfer-controls/
Automatic Transfer Switches: https://etccontrols.com/services/emergencytransfercontrols-transfer-controls/

Product Features
Company NameFound YearCountryCEO
Gustavo Preston Company1881Massachusetts, United StatesDavid Pellegrini

Controlled Power Automatic Transfer Switch

Wholesaler of liquid- and air-cooled generators’ two-pole automatic transfer switches, both new and old. With a power supply of 120/240 V and 50/60 Hz, 50 A, 100 A, and 200 A currents are available for NEMA 1 & 3R switches.
Homepage: https://www.controlledpwr.com/
About: https://www.controlledpwr.com/our-company/who-we-are/
Contact: https://www.controlledpwr.com/contact-us/

Product Features
Company NameFound YearCountryCEO
Controlled Power Company1971Troy, M+ichigan Nick Pascoe

Eaton ATS

Eaton is a manufacturer of automatic transfer switches for switching loads and electrical distribution systems from one power source to another. Additional services like advising, training, assembly and storage are also offered. The specification calls for continuous current ratings of up to 5,000 A at 600 V. serves the oil and gas, mining, food and beverage, healthcare, and aerospace industries.
Homepage: https://www.eaton.com/us/en-us.html
About: https://www.eaton.com/us/en-us/company/about-us.html
Services: https://www.eaton.com/us/en-us/services.html

Product Features
Company NameFound YearCountryCEO
Eaton1897Bloomfield, New Jersey, United StatesCraig Arnold

Global Power Supply ATS

Global Power Supply supplies automatic transfer switches that are dependable, strong, versatile, and small for moving vital loads and electrical distribution systems from one power source to another. Automatic transfer switches from 30A to 5000A in various sizes are offered by GPS. It contains distinctive features that make it simple to install, integrate, and use. suitable for a wide range of industrial and commercial situations, from emergency standby applications to critical power processes. GPS provides options for open transition, closed transition, and bypass isolation.
Homepage: https://www.globalpwr.com/
About: https://www.globalpwr.com/about-gps/
Solutions: https://www.globalpwr.com/industrial-power-solutions/
Automatic Transfer Switches: https://www.globalpwr.com/industrial-power-solutions/automatic-transfer-switch-ats/

Product Features
Company NameFound YearCountryCEO
 Global Power Supply LLC.2004Santa Barbara, CaliforniaTrent Robbins

PTS APAC Private Limited ATS

PTS APAC Private Limited is a Singapore technology business that produces a comprehensive range of transfer switches under the domestic brand “PTS” that are intended to transfer electrical loads seamlessly between the alternative power sources in your need.
Power transfer switches can be inspected, tested, and maintained without cutting the power. In less than 100 milliseconds, the PTS series of Closed Transition Transfer Switches provide closed transition overlapping of sources. Its capacity to transfer in a closed transition mode while both sources are inside predetermined bounds is what makes it so successful.
Homepage: https://www.ptsapac.com/
About: https://www.ptsapac.com/about-us/
Products: https://www.ptsapac.com/our-products/
Automatic Transfer Switches: https://www.ptsapac.com/our-products/pts-low-voltage-lv-automatic-transfer-switches/ts-iaccl-automatic/

Product Features
Company NameFound YearCountryCEO
PTS APAC Private Limited2020SingaporeKuan Heng Lim(George)

Chint Shield Automatic Transfer Switch

Chint Shield provides a comprehensive low-voltage electrical solution for residential, commercial, and industrial applications. Many of the items are designed, made, and assembled in the UK. Chint Shield has built a strong commercial and technical team through consistent investment in excellent personnel, enabling it to serve the needs of its expanding customer base from its position just south of Manchester.

Homepage: https://chint.co.uk/
About: https://chint.co.uk/about-us/
Services: https://chint.co.uk/product-category/energy-distribution/#
Automatic Transfer Switch: https://chint.co.uk/product-category/industrial-controls/automatic-transfer-switches/

Product Features
Company NameFound YearCountryCEO
Chint Shield2004United KingdomGraham Chadwick

Asco Power Technologies ATS

Asco Power Technologies offers a variety of ATS solutions that make it simple to move loads between utility and backup power sources in order to increase power availability. ASCO ATS are UL 1008 rated and made to work with almost any generator. Find a device to support applications from commercial businesses to mission-critical facilities by browsing on their ATS offerings.

Asco Power Technologies Homepage: https://www.ascopower.com/us/en/
About Asco Power Technologies: https://www.ascopower.com/us/en/about-us/
Products: https://www.ascopower.com/us/en/products/
Automatic Transfer Switches: https://www.ascopower.com/us/en/product-subcategory/89094-automatic-transfer-switches/

Product Features
Company NameFound YearCountryCEO
Asco Power Technologies1888Brantford, CanadaMichael Quinn

What is an Automatic Transfer Switch?

An automatic transfer switch (ATS) is a device that, when it detects a malfunction or outage in the primary source, switches the power supply from the primary source to a backup source automatically. When a primary power system fails, the ATS activates a standby power source, such as an uninterruptible power supply. To keep electric equipment running until grid power is restored, an ATS can also start up longer-term backup power solutions, such as local diesel generators.

Working Principle of an Automatic Transfer Switch

The control logic predominates in the automated transfer switch, an intelligent power switching device that acts independently. Automated conversion’s basic goal is continuous power delivery. Its function is to join one of the two power supply to the connected load circuit. ATS also serves as a safeguard against minor power interruptions and interference with your activities. The size of the generator and ATS are selected based on the needs of the building. Intelligent power and backup transfer is made possible by automatic transfer switches, ensuring business continuity. In addition, it helps avoid the expenditures related to environmental dread, such as those related to big industry, commerce, or even fatal hospital failures.

Automatic Transfer Switch Types

Transfer switch systems come in four different varieties, and you can pick the one that best suits your needs. They are all fighting to keep power safe and have the same goal in mind. Each system, though, complies with distinct standards and has a variety of applications. You must thus consult an expert to determine which system is best for your building.

Open transition ATS

Popular in the system is the first-break or open-transition strategy. Dealing with short-term power disruptions is advantageous. They switch between utility and reserve power instead. The one-second wait makes the transfer more secure. It ensures that no one close utilizing a device will have their utility jeopardized. Another type of ATS in this category is the programmable transition switch. Before power is restored, a gap between mains and generator power enables the circuit’s residual voltage to exhaust.

Closed transition ATS

This type of technology can be used in areas where the manufacturer of the goods will not tolerate any kind of disruption. The closed transition ATS’s internal mechanisms will allow for the simultaneous activation of both power sources. As long as you adhere to safety regulations, transitions go well. However, because to the complexity of these systems, it is significantly more expensive than the present transitional solutions.

Soft load transfer switch
The soft load transfer switch is analogous to a closed transition ATS. However, the amount of load it can support can vary depending on the situation. This skill carries an extra fee. However, it gives companies additional choices if they need more backup power.

Bypass isolation ATS

This system is the most complex but has the highest capabilities. It consists of two methods, usually parallel to each other, allowing inspection and maintenance. You can generally see this setting in the most sensitive space. The application includes life support systems, air traffic control, telecommunications, and other priority settings.

ATS Typical Transfer Sequence

1. Regular utility power sources are ineffective.

2. When the electricity from the generator or backup utility feed is stable, and within the permitted voltage and frequency limitations, the transfer switch switches the load to the emergency power source. The transfer procedure can be self-acting or manually triggered, depending on the requirements and preferences of a facility.

3. When utility power is restored, the transfer switch switches the load from the emergency power source to the regular power source. Either manually or automatically initiating the transfer process.

ATS Arrangements

Multiple configurations are possible with both two and three power sources.

Two power sources


The typical transfer switch setup includes a generator for backup power and electric utility service. A familiar name for this system configuration is an emergency standby generator system. Some engine-generator sets may be functioning simultaneously under the appearance of a single generator.


This use case uses two utility sources to give the distribution system redundancy and enable speedy service restoration to the load in the event of an upstream equipment failure. The two sources could be independent of one another, necessitating the provision of two electric services by the public utility provider, or they could come from a single electric service dispersed via redundant pathways inside the facility.


Sometimes, transfer switches switch the primary power between two generator sets, especially in remote sites. In such circumstances, the generator might need to deliver constant electricity around-the-clock. Source power is frequently switched between the generator sets to distribute run-time equally.

Three power sources


Critical facilities usually include provisions for a second generator connection as a redundant emergency backup that can be used during bad weather or when the first generator is undergoing planned maintenance when establishing an emergency standby generator system.

As seen, the first generator is occasionally installed permanently on the property, whilst the second generator is a portable roll-up unit that is only used as necessary.


With this design, the redundancy provided by a dual utility setup is supplemented with an emergency standby generator supply. As shown, the generator can be allocated for use by a single transfer switch or shared among numerous transfer switches using a priority management system.

ATS modes of operation


Manual action is required for transfer initiation and operation, usually by pushing a button or turning a handle.


Press a button or switch to manually start a transfer, activating an internal electronic device and electrically operating the switching mechanism.


When the automatic controller detects an absence or loss of source power, the transfer switch controller initiates both initiation and operation, followed by a switching mechanism operation.

Switching Mechanisms

The component of a transfer switch called the switching mechanism is in charge of conveying the rated electrical current and transferring the load connection from one power source to another. These consist of the following:

Contactor type

The most popular and often least expensive sort of switching mechanism is this one. A single operator opens one set of power contacts while shutting the second set of contacts in a contactor, designed as an electrically controlled, double-throw switch.

Moulded case type

Molded case switches have straightforward designs and can accommodate a mechanically operated, over-centre toggle or a motor operator. They are frequently used to close and interrupt a circuit between detachable contacts under normal and abnormal conditions.

Power frame type

Compared to moulded case switches, power frame switches are more powerful, quicker, and able to handle up to 5,000 amps. Utilizing a two-step stored energy technique, it can operate manually and electrically while under stress.

ATS Variation by Application

Switched neutral

Transfer switches can be set up with a fully-rated fourth pole that functions much like the individual phase (A, B, and C) power poles for three-phase power applications that demand switching the neutral wire. It is possible to configure a fully-rated third pole for single-phase applications. A switched neutral is frequently employed when independent power sources power the transfer switch.

Bypass isolation automatic transfer switches

Bypass isolation automatic transfer switches offer dual switching capabilities and redundancy for essential applications, resulting in easier maintenance and increased uptime. The primary ATS distributes electricity to the load daily, while the bypass switch acts as a backup or redundant system.
Because it enables routine maintenance, inspection, and testing as code requires, a bypass isolation transfer switch is frequently chosen for use in healthcare and other critical applications. It is because it allows the ATS, and in some cases, the bypass switch, to be drawn out and isolated from the power source(s) (NFPA 110).

Service entrance transfer switches

To ensure that essential loads can switch quickly and securely to emergency power if utility power is stopped, facilities with a single utility connection and a single emergency power source frequently have an ATS installed at the service door. Non-critical loads are commonly prevented from connecting to or being shed from the emergency power source to avoid overload capacity.


It is essential to consider the withstand current closing rating (WCR) while deploying a transfer switch in a power distribution system to ensure system integrity and dependability. Transfer switches may be labelled with one or more short-circuit or short-time WCRs unique to a type of current protection device under the UL1008 standard. Multiple rating transfer switches offer more application flexibility.
How to Select the Co

How to Select the Correct Automatic Transfer Switch

The most crucial is size, which should be considered when choosing an automatic transfer switch for a diesel generator. The type of load, voltage, and continuous current rating is covered in part one of this article.
Choosing an automatic transfer switch is crucial to guarantee optimal dependability and sufficient capacity in both routine and emergency scenarios. However, reliability and cost are ultimately the most prevalent deciding criteria.

How does it function?

You must examine the automated transfer switch’s operation:

Open-Transition Devices– These transfer devices must first open the source to which they are linked before they may connect to another device. This indicates that there will be a brief stoppage.

Fast closed-transition-This one can link without opening. When both sources are available, the two sources operate concurrently, and the initial seed is unplugged.
Soft closed-transition In a smooth closed transition, the devices actively synchronise the sources before a ramp load impulse connects them.

Sub-cycle transfer– Because the switch uses a quarter of the power cycle, this method has a tiny interruption. Typically, a UPS device is utilized with it.
Based on the required loads, the mode to utilize is chosen. Since life support machines will depend on it, if you are buying for a hospital, you will want one without power interruptions. On the other hand, if you are buying for a business office building, a little disruption is OK.

Continuous Current Rating

You should choose an automatic transfer switch that can supply maximum current for three or even more hours. The power supply should transmit the current continuously. The typical range of current ratings is 30 to 400 Amps. It’s crucial that the rating corresponds to the primary breaker’s intended function. As a result, your ATS should have a carrying capacity of 100 Amps if your main breaker does.

Load Type

There are numerous types of loads. They consist of the following:
Motor for restrictive loads
Systemwide loads
Loads for incandescent and electric discharge lamps
The load type that the generator can handle will be marked on it. An ATS is frequently advised since it takes various loads well and can handle the complete system load.

Voltage Rating

Two AC power sources that are not synchronized can be linked to an ATS. This is significant because the transfer switch’s insulation needs to be sufficient to handle the increased voltage.

ATS Styles

There are three different styles of them. This is significant because, occasionally, your client will request a particular type.

Load Centers – The sub-panel and ATS are combined by the load centre in one circuit. It is constrained because it can only drive modest loads in a home setting. Load centers can handle only 8 to 16 mission-critical courses simultaneously.
Standard Switches – Because this is the traditional method, it is not very well-liked in modern society. It is where the sub-panel and ATS are installed.
Service Disconnect – This ATS is what you need if you’re working with a more significant generator or want to power a house that consumes up to 200 Amps. It is frequently put in place between the meter and the electrical panel. Although it is the most expensive of the three, installation is significantly more straightforward than the load center.

You must comprehend your client’s applications and requirements to choose the automatic transfer switch that is best for the specific case. If you are dealing with an emergency, you want dependable and intuitive control with little to no interruption, if there is any disruption at all. Give us a call so we can talk about your needs and the available solutions.

Advantages of Using Automatic Transfer Switch

A transfer switch improves efficiency and assurance for your company. You will benefit from selecting the appropriate button for your purposes if:

Power reliability. Your business comes to a complete halt if you lose access to power for whatever reason. Although a generator might somewhat minimize this, you need to physically connect your generator to the operations you want to resume. This task not only takes a lot of time and causes downtime but also restricts how well your generator works.

Safety. Handling any power source at all can have adverse effects. An unexpected power outage can be dangerous for workers, and managing a manual generator hookup can be disastrous—especially at night! Your objective needs are met by a transfer switch, which eliminates the risks connected with an outage.

Simplified operations. You choose which processes to power automatically when you install your automatic transfer switch. This category can fall under everything from lighting to HVAC systems, business machinery, or refrigerators. This procedure dramatically streamlines power restoration and enhances the performance of your generator.

Businesses That Benefit the Most from Automatic Transfer Switch

Any business, no matter how big or little, can benefit from an automatic transfer switch. And we guarantee that you’ll think the cost was well spent. But when you consider an automatic transfer switch, certain businesses spring to mind, such as:

– Hospitals
– Government buildings
– Commercial structures
– Factories
– Warehouses
– Restaurants
– Schools

Things to Consider in Choosing the Right ATS Manufacturer for you business

The automatic Transfer Switch is permanently installed in your building and connected to your backup generator and your most crucial circuits. The switch can start the generator and automatically switch the loads from the utility grid to the generator if it detects a disturbance in the utility electricity.

Critical equipment disruptions are minimized as a result of this almost instantaneous action. There are various things to think about when choosing an automatic transfer switch for your facility:

Total Amperage

Amperage is a way to measure electrical current. A breaker will trip if you exceed the number of amps that each circuit in your building is designed to withstand to keep the wire from overheating and catching fire. The total amperage of all the courses that transfer switches will be switching is indicated by their current rating, which is another feature.

Once you’ve determined which circuits you’ll need to maintain electricity during a power loss, sum up all the devices on those circuits’ current demands, then pick a transfer switch that offers a sufficient margin for future development without exceeding that rating.


Commercial and industrial buildings’ circuits can run at various voltages, such as 208/240 volts, 480 volts, and 575/600 volts. Make that your transfer switch supports the voltages of your equipment and circuits. All of the automatic transfer switches we provide at PSI Power & Controls have multi-tap transformers that can help 208/240, 480, and 575/600 volts.


Watts are a gauge of strength. The watts of an electrical circuit are calculated by multiplying the circuit voltage by the device’s amperage. Many generators are rated in watts or kilowatts, so it’s critical to understand the total amperage and wattage of the loads you’ll be powering if you want to match the generator output to the transfer switch’s current restrictions.


An electromechanical device called a transfer switch is used to mechanically or electronically switch the load between two power sources. To ensure a constant supply of power, it offers a quick transition between several power sources. Manual transfer switches must be flipped manually to restore power, which requires access to a generator or other power source. Automatic transfer switches (ATS), on the other hand, do not require external inputs and may switch over quickly to generator power in the event of a power outage. These switches are more cost-effective, safer, and more reliable while also operating with less risk. In commercial and industrial contexts, including factories, warehouses, hospitals, and schools where a constant power source is required, these switches are widely used.

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