Rated operational current depends on your system voltage: 50 A at 700 V DC, 32 A at 800 V DC, and 20 A at 1000 V DC, all under utilisation category DC-21B (resistive/lightly inductive loads, typical for PV disconnects). The part is polarity-insensitive, so it handles bi-directional current — no need to orient for string direction.
The unit occupies 8 x 9 mm pitches (72 mm wide).
Environmental and electrical endurance
Rated insulation voltage 1000 V DC, impulse withstand 6 kV. Pollution degree 2 (non-conductive pollution only).