It's built for DC circuits where isolation is mandatory — photovoltaic arrays and marine DC distribution are the stated application targets. The DC-22A and DC-PV2 utilisation categories tell you it's tested for switching motor and resistive loads in DC systems, plus PV-side switching with the higher arcing stress of solar arrays.
The 160 A rating holds across both DC-22A and DC-PV2 duty — no derating between motor-starting and PV fault-current profiles at this current level. The 1500 V DC operational voltage is the maximum system voltage it can switch; insulation is rated 1600 V DC, giving a 100 V margin above the working voltage. Short-time withstand current is 3.5 kA for 1 second, which means it can ride through a fault long enough for an upstream fuse or breaker to clear without welding contacts.
Fixed-mount on a backplate, 140 mm wide, 161 mm high, 86 mm deep. IP40 means tool-proof finger protection but not washdown; IK07 handles light mechanical impact.