Weidmueller VPU ZPA S I 3 RA 300/7,5

The VPU ZPA S I 3 RA 300/7,5  is a voltage protection unit for AC systems. "ZPA" likely refers to a specific series or model, "S" may indicate a special feature or variant, and "I" denotes the protection type. "3+1" refers to three-phase plus neutral protection, while "300" is the voltage rating. "7.5" indicates the surge current rating, with the unit designed to withstand up to 7.5kA, providing reliable protection against voltage surges and fluctuations.