Yint Electronics Recommends Using a Varistor for Input Overvoltage Protection of Smart Meters
For smart meters, voltage signal collection is required, and the voltage and sampling methods of single-phase meters and three-phase meters are different. The picture below shows the voltage acquisition input terminal of a single-phase ammeter.
Fig.1
YINT Electronics recommends using a varistor for input overvoltage protection. The recommended models are 14D or 20D products with voltages of 470V (single-phase 220V) ~ 820V (three-phase 380V):
Table.1
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