The Bender ISOPV425 is a specialized insulation monitoring device designed for unearthed photovoltaic (PV) systems (IT systems). It provides continuous monitoring of the insulation resistance for DC and AC components of a PV system, ensuring maximum operational safety and system availability. By utilizing a patented measurement principle, the ISOPV425 reliably detects both symmetrical and asymmetrical insulation faults, even under challenging conditions such as high system leakage capacitances. This device is essential for preventing electrical hazards, reducing the risk of fire, and ensuring the long-term performance of solar power installations.