NB/T42150-2021低压电涌保护器专用保护装置英文版(6)

3.1
specific protective devices for low-voltage surge protective devices (SSD)
external detachment device intended for surge protective devices (SPDs) in low-voltage power supply systems, which can withstand the expected surge current at the place where the protected SPD is installed, and can cut off the over-current at power frequency caused by SPD failure and is characterized by actuation with small current at power frequency
3.2
rated operational voltage

NB/T 42150-2021 低压电涌保护器专用保