Tronic Automatic Transfer Switch 630A

Our review

This is a 630A automatic transfer switch from Tronic, built around a microprocessor controller that watches the incoming supply for voltage problems. According to the listing, it reacts to loss of main power, over voltage, under voltage and phase faults, moving the load to the backup source. That makes it relevant to larger installations where a generator or second supply has to take over without someone standing at a changeover panel. Before buying, confirm your system's current rating, the number of phases and whether your generator's controller can accept an external transfer signal, since none of that is stated in the listing. Compare it with contactor-based changeover setups, which are simpler but slower and less selective, and with other microprocessor ATS units, where the differences usually come down to sensing accuracy and how the phases are monitored. If your supply is unstable, the voltage and phase monitoring is the part worth paying attention to. Available on Sokonia.