Automatic transfer switches (ATS)
Automatic transfer switches (ATS) monitor the mains supply and, during a power cut, automatically switch your loads to a backup source such as a generator or an inverter with a battery. They suit houses, holiday homes, workshops and businesses, and mount on a DIN rail in the consumer unit or distribution board.
Automatic transfer switches (ATS)
Two-pole models switch the phase and neutral of a single-phase 230 V supply, three-pole models switch three phases and four-pole models switch three phases plus neutral. Choose a rated current of 63 A, 100 A or 125 A that’s equal to or higher than the main fuse rating.
A slide switch lets you choose between automatic and manual mode, and in manual mode you change source with the rotary lever. Indicator lights show the active source, and auxiliary contacts can be used for signalling. On some models, switching takes less than 50 ms, according to the manufacturer. Even so, they don’t replace a UPS, as there’s always a brief interruption, so computers need their own UPS.
The switch only ever connects your loads to one source, so the backup source doesn’t feed power back into the public grid. Have a qualified electrician handle the installation and the generator connection. Before working in the distribution board, disconnect both the mains and the backup source, as the terminals can stay live even during a power cut.
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