LYD1-B 80 SPD invalid or not, meanwhile check red indicator for fuse lighting or not, please replace the invalid element on time LYD1-B 80 SPD In three phases and four wires system, all three phase lines and one neutral line to earting line have SPD to be protected, in normal...

SPD is suitable for AC 50/60HZ,rated voltage 220V singal phase power supply system, to protect household appliances. SPD is suitable for AC 50/60Hz, rated voltage 220V single phase power supply system, to protect household appliances and similar used device from lightning impulse...