Weidmueller VPU I 3+1 R 280V/12,5KA

The    VPU I 3+1 R 280V/12,5KA is a voltage protection unit for AC systems. "I" likely refers to a specific protection class or type. "1+1" indicates protection for one phase plus neutral, or possibly a similar configuration. "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 provides surge protection for single-phase systems with neutral, offering reliable protection in industrial or commercial applications where high surge current handling is necessary.