This Acti9 iPF K 40 product is a modular surge arrester. It protects 3P+N installations. The Imax maximum discharge current is 40kA .The In nominal discharge current is 15kA. The multi-pole single-piece surge arrester range is adapted for TT and TN-S earthing systems. This type 2 incoming protection surge arrester is recommended for a medium risk level. The Uc maximum continuous operating voltage in common mode (between neutral and earth) is 260VAC. The Uc maximum continuous operating voltage in differential mode (between phase and neutral) is 340VAC. The Up Voltage protection level is 1.5kV in common mode (between neutral and earth) and in differential mode (between phase and neutral). The Ue rated operational voltage is 230VAC or 400VAC +/- 10%.