Weidmueller VPU ZPA I 3+1 300/7,5

The  VPU ZPA I 3+1 300/7,5  is a voltage protection unit for AC systems. "ZPA" indicates the specific model series, "S" may refer to a special feature, and "I" denotes the protection type. "3+1" refers to three-phase plus neutral protection, "RA" likely stands for a specific reset or automatic function, "300" is the voltage rating, and "12.5" is the surge current rating, with the unit capable of handling up to 12.5kA, offering advanced protection against voltage surges and fluctuations.