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

The VPU I 3+1 R LCF 280V/12.5KA is a voltage protection unit for AC systems. "I" refers to a specific protection class or type. "3+1" indicates protection for three phases plus neutral. "R" denotes a reset function. "LCF" likely refers to a special protective feature, such as "Low Current Failure" or another protective mechanism. "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 multi-phase systems with neutral from voltage surges, providing enhanced protection with specialized features in industrial or commercial applications that require handling of high surge currents.