![]() Transfer switches with multiple ratings provide greater application flexibility. The UL1008 standard permits transfer switches to be marked with one or more short-circuit and/or short-time WCR’s specific to an overcurrent protection device type. When applying a transfer switch for use in a power distribution system consideration must be given to the withstand closing current rating (WCR) to ensure system integrity and reliability. Non-critical loads are often inhibited or shed from connection to the emergency power source to avoid capacity overload. The primary ATS handles the day-to-day distribution of electrical power to the load, while the bypass switch serves as a backup or redundant device.Ī bypass isolation transfer switch is frequently selected for use in healthcare and other critical applications because it allows the ATS, and in some cases the bypass switch, to be drawn out and isolated from the power source(s) to facilitate regular maintenance, inspection and testing as prescribed by code (NFPA 110).įacilities with a single utility connection and a single emergency power source will often have an ATS located at the service entrance to ensure that critical loads can quickly and safely shift to emergency power if utility power is interrupted. It features all of the limbs in different orientations (the arms upside-down, the legs reversed) from the final model and the chest sports an Autobot symbol (), suggesting, perhaps, that the Stunticon and Aerialbot toy factions may have originally been the other way around. A switched neutral is commonly used when the transfer switch is fed by separately derived power sources.īypass isolation automatic transfer switchesįor simplified maintenance and improved uptime, bypass isolation automatic transfer switches provide dual switching functionality and redundancy for critical applications. For single-phase applications, a fully-rated third pole can be configured. The alternate modes of Autobots are usually cars, trucks and various other ground-based civilian vehicles.
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