FAQ’S

Questions/Answers about Transfer Switches

What is automatic transfer switching?

An automatic transfer switch (ATS) is a device that automatically transfers a power supply from its primary source to a backup source when it senses a failure or outage in the primary source.

What are the two types of automatic transfer switches?

There are two types of automatic transfer switches, circuit breaker and contactor. The circuit breaker type has two interlocked circuit breakers, so only one breaker can be closed any anytime. The contactor type is simpler design that is electrically operated and mechanically held.

Are automatic transfer switches legal?

A transfer switch (either manual or automatic) is required in every country when installing a generator at premises with a mains supply. It is required by law for good reason. A transfer switch avoids: The mains power coming into contact with the generator, which would almost certainly burn out if this happened.

What is the difference between ATS and MTS?

The way they differ is that an MTS requires manual switching to change sources, where an ATS monitors the utility power and changes sources automatically when a power failure occurs.

Where are ATS switches used?

An Automatic Transfer Switch (ATS) is often installed where a backup generator is located, so that the generator may provide temporary electrical power if the utility source fails.

What is the difference between transfer switch and ATS?

When power fails: The automatic transfer switch commands the generator to start. When generator is ready to supply power, the ATS switches emergency power to the load. Once utility power is restored ATS switches to utility power and commands generator shutdown.

What are the 4 types of switches?

There are four main types of switches— single pole single throw, single pole double throw, double pole single throw, or double pole double throw.

Why use an automatic transfer switch?

An automatic transfer switch monitors your power sources constantly. With an automatic transfer switch, your standby generator can automatically switch on and off as needed during a power outage so that there’s no need for you to manually turn on the generator. This makes it both easier and safer to use your generator.

What is the difference between STS and ATS?

For reference STS are Static Transfer Switches with no break in supply during transfer. ATS are Automatic Transfer Switches with a short ms break (specified) in supply and suitable for modern switch mode power supply protection.

How much does it cost to put in an automatic transfer switch?

The average generator transfer switch installation cost for manual transfer switches ranges from about $400 to $1,300. This includes all the costs of materials and labor. For automatic transfer switches, the average generator transfer switch installation cost is something between $600 and $2,000.

Can an automatic transfer switch be used manually?

Depending on a facility’s needs and preferences, the transfer process is self-acting or manually-initiated. The transfer switch returns the load from the emergency power source to the normal power source when utility power is restored. The retransfer process is self-acting or manually-initiated.

How do transfer switches work?

How Does a Manual Transfer Switch Work? A manual transfer switch connects a generator to your home’s main circuits and switches them to run on backup power during an outage. This means any appliance on that circuit will be powered. Many manual transfer switches are NEMA rated for indoor or outdoor installation.

Where should ATS be located?

ATS equipment can be located in: Main Distribution Board (MDB) – ATS for backing up the power supply for most of facility loads with Main-Main (or Utility-Utility or Transformer- Transformer), Main-Tie-Main, etc. power supply configurations.

How does ATS work in electrical?

The ATS panel monitors the incoming AC mains supply so that, should there be a blackout, the electrical load is transferred to the standby generator. When the mains power is restored, the ATS transfer switch then returns the building back to the mains supply, and shuts down the backup generator.

Where is the best location for an automatic transfer switch?

They can be near each other or the generator can be on the ground and your transfer switch can be on the roof of a 50-story building – it really doesn’t matter. Generally wherever the emergency power (that dedication) is located that’s where the transfer switch is going to be.

What is the disadvantage of manual transfer switch?

The biggest drawback of a manual transfer switch is the time it takes to connect your temporary electrical power supply than an automatic transfer switch. This makes company downtimes much longer.

Should I get a transfer switch?

Is a Transfer Switch Required? If your generator is above 5,000 watts, you will always need a transfer switch for safety reasons and ease of use. This is important to remember, as the level of power being produced requires the use of a regulator to help keep surges and backfeeding the grid from happening.

What are the 2 types of switches used in networks today?

Edge switches, also known as access switches: They handle traffic entering and departing the network. Edge switches link various devices, including personal computers and access points. Aggregation switches: Switches for aggregation or dissemination are located within an optional intermediary layer.

What is the difference between mechanical switch and electronic switch?

Mechanical Switches are physical switches, which must be activated physically, by moving, pressing, releasing, or touching its contacts. Electronic Switches, on the other hand, do not require any physical contact in order to control a circuit. These are activated by semiconductor action.

What is the difference between inverter and transfer switch?

A transfer switch is essential when using a power inverter which is connected to an AC source so that the inverter is not “backfed” when power is applied to the same line. A electrical transfer switch is a switch that switches a load between two sources, most commonly for us an inverter and incoming AC.

What causes ATS failure?

Loose Connections, Corrosion, Accumulation of Dust, Dirt and Leaves. When an ATS is not regularly maintained, it can build up dirt inside from dust, sand, or exposure to the elements. There may be loose connections or corrosion due to regular use, common to electrical devices.

Which is faster ATS or STS?

Compared with the traditional ATS automatic transfer switch, the STS static transfer switch has a conversion rate of ms level (≤8 m s), provides rapid load change (usually 1/4 cycle time), and can complete the continuous conversion of the power circuit.

Do I need an electrician to install a transfer switch?

If you are planning on connecting the generator directly to your home, it is the only safe way to do so! This option requires the installation by a licensed electrician and will require a permit. A professionally installed transfer switch makes using your generator easy and safe.

Can I install a transfer switch myself?

Choosing to DIY the installation of a generator transfer switch might be cheaper than hiring an electrician, but it requires some serious electrical knowledge and skill. If you don’t have professional experience as an electrician, we recommend looking into hiring outside help.

What is the life expectancy of an automatic transfer switch?

What is the expected operational life expectancy of the Auto Transfer Switch? The Auto Transfer Switch has been designed with a life expectancy of 100,000 operations. Within a Data Center environment this would be considered a life time warranty for the switching system.

Can an ATS work with any generator?

Manual and automatic transfer switches can work with any type of generator. Generally, if you have a portable, towable, or PTO generator, you will select a manual transfer switch.

Does an automatic transfer switch need a disconnect?

Service Entrance Rated

The automatic transfer switch includes a circuit breaker that turns off the utility service to the home. All homes are required to have a primary disconnect. Sometimes this is a fused switch located near the utility meter.

What kind of transfer switch do I need?

You need an automatic transfer switch, which links your generator with your home. An automatic transfer switch constantly monitors the power coming into your home from the utility. When a blackout happens, it automatically switches your home to standby power without any manual effort on your part.

How do you size an automatic transfer switch?

Sizing Your Automatic Transfer Switch

For service disconnect switches, the amperage must match that of the main breaker in your electrical panel, (it’s usually located at the very top of the box.) So, if you have a 200-amp main breaker, you’ll need a 200 amp automatic transfer switch.

What is the advantage of ATS system?

An ATS ensures that everyone is going through the same steps, which protects candidates (and employers) from the risk of unconscious bias. Eliminating unconscious bias in the hiring process provides the opportunities that come with selecting from a larger pool of talent.

What are the two types of automatic transfer switches?

There are two types of automatic transfer switches, circuit breaker and contactor. The circuit breaker type has two interlocked circuit breakers, so only one breaker can be closed any anytime. The contactor type is simpler design that is electrically operated and mechanically held.