Single-pole surge arresters of test class III, combined type. U0 = 24 V AC.
Uoc (1,2/50) = 2 kV. They are installed within II - III lightning protection zones (in accordance with GOST R IEC 62305-1 and SO-153-34.21.122).
They are designed to protect equipment from residual surge surges for AC and DC circuits. For remote control the devices are equipped with dry contact of remote signalling.
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