Weidmueller VPU ZPA S I 3 RA 300/12,5

The VPU ZPA S I 3 RA 300/12,5  is a voltage protection unit for AC systems. "ZPA" refers to a specific series or model, "S" may indicate a special feature, and "I" denotes the protection type. "3+1" indicates three-phase plus neutral protection, "R" likely refers to a reset function, "300" is the voltage rating, and "12.5" signifies the surge current rating, with the unit capable of handling up to 12.5kA, protecting equipment from voltage surges and fluctuations.