Weidmueller VPU I 4 R 280V/12,5KA

The VPU I 4 R 280V/12.5KA is a voltage protection unit for AC systems. "I" likely refers to a specific protection class or type. "4" indicates protection for four circuits or phases. "R" denotes a reset function. "280V" represents the voltage rating, and "12.5KA" signifies the surge current rating, meaning the unit can handle up to 12.5 kA of surge current. This unit is designed to protect electrical equipment from voltage surges, providing reliable protection for multi-phase systems in industrial or commercial applications where high surge current handling is required.