How to Select a Right Automatic Transfer Switch?
When the switch detects a utility power outage, it can start the generator, automatically transferring the load from the utility grid to the generator. Automatic transfer switches are used to automatically transfer loads from utility power to backup power or backup power in the event of a power outage or as required.
A careful selection of switches ensures adequate capability, safety and maximum reliability in both normal and emergency situations. Therefore, factors such as load type, continuous current rating, voltage rating and style must be considered. In addition, price and compatibility must also be considered. In this article, we will introduce some points that you should consider when choosing automatic transfer switch.
- Continuous Current Rating. The automatic changeover switch should be able to supply the maximum current for 3 hours or more of continuous load. ATS transfer switch should be able to continuously deliver current to critical loads from a utility or emergency power source. Intelligent automatic transfer switches are available in current ratings ranging from 30 amps to 400 amps. It is recommended that the current rating of the ATS matches the current rating of the main circuit breaker on the electrical control panel. For example, if you have a 100 amp main breaker, you will need a 100 amp ATS.
- Type of Load. Various loads include total system load, motor load, limit load, and incandescent lamp load. Almost all transfer switches for generators are marked to indicate what kind of load it can handle. ATS dual power transfer switch capable of handling the total system load is generally recommended as it can handle a variety of loads.
- Voltage Rating. Auto transfer switch is one of the few electronic devices that can connect two unsynchronized power sources at the same time. This is very important because the transfer switch must provide sufficient insulation to handle the increased voltage stress. ATO.com provide different current automatic change over, such as 1000 amp, 1600 amp, 2000 amp and 3200 amp automatic power transfer switch. Standard frequencies are 50 or 60 Hz. Automatic transfer switches will allow other frequencies and voltages to be used if required.
- Mode of Operation. Automatic transfer switches are divided into four categories based on operating conditions and associated power interruptions. Open-transition transfer devices. This works by opening the connected source before connecting to the new one. Causes an interruption for a short time; Fast closed-transition transfer devices which works by paralleling two sources and disconnect one source when both are available; Soft closed-transition devices work in such a way that they actively synchronize the sources when transferring the live sources and connect them together with a ramp load impulse to the backup power source; Sub-cycle transfer devices which transfer the control from one source to the other within a quarter of the electrical power cycle hence the interruption is slight. Used in UPS devices.
Choosing a dual power automatic transfer switch switch requires careful consideration of its parameters to ensure that when a power outage occurs, the switch will have the ability to handle the load reliably. While price is one factor, there should be a balance between safety, level of protection and reliability. However, more reliable equipment that provides uninterrupted power will also translate into higher costs.