An automatic transfer switch transfers the power source from secondary or tertiary power source. It is used most often in power distribution systems. Transfer switches are common in areas where there are emergency power generators to back up power from the utility source.
Automatic transfer switches are more convenient than the manual transfer switches. Transfer switches are very useful, because when the main power source is interrupted, they automatically transfer the power source to another electrical system.
In cases such as voltage alterations in power supplies, a transfer switch prevents potential damage to internal circuits of appliances. An automatic transfer switch transfers the power from the main source to a backup generator. It does not transfer back to the main power supply unless it has showed stability of its voltage power.
The other variation for auto transfer switches is a generator automatic transfer switch. Often, a generator auto transfer switch is equipped with additional circuit segment such as a computer, that monitors the incoming power. It also oversees the internal circuit for possible voltage sags due to brownout, power spikes and power surges.
When there are power disruptions, the transfer switches automatically begin the transfer of loads. It commands the emergency power supply to warm up if there are irregularities on the main power supply. When the emergency power supply reaches the proper voltage, it is ready to provide power. It remains to act as the power source until the main power supply has solved its inconsistencies for a certain period of time.
When such thing happens, the transfer switches turn off the generator after it allowed time to deplete its electricity and to cool. Auto transfer switches are ideal when it is required to supply power to critical circuits or whole electrical sub panels.
Moreover, a power transfer switch performs load shedding or giving priority to optional circuits such as heating and cooling equipment. In an emergency system, it is natural to have a momentary interruption of power to the load. This power interruption is irrelevant, if it is only for a moment.
Nevertheless, there are certain loads that are easily affected even by the smallest power outage. Also, there are conditions during operation when it is deemed necessary to transfer loads with zero power disruption. This is made possible with a closed transition transfer switch.
A closed transition transfer switch is a make-before-break type. In initiating load transfer using such methodology, it functions in a make-before-break mode-making a contact with another power source before it breaks its contact from the other source. However, this is only possible when both power sources are respectively synchronized.
The open transition transfer switch is the opposite. It is the break-before-make automatic transfer switch. It breaks contact with one power source before it makes contact with another. It prevents back feeding of power from an emergency generator back into the utility line in circumstances such as having a manual three position circuit breaker and open transition automatic transfer switch.
At our site, http://www.relectric.com , you will get automatic transfer switches. We are the stocking distributor for ASCO Switches. We have both manual and auto switches. Switches are for residential or corporations. Go to Transfer switch and get switches to protect your equipment.
Tags: automatic transfer switch, circuit protection, electrical supplies, electrical transfer switch, Home Improvement, power transfer, safety transfer switch, transfer switch