Rated current is temperature-dependent: 2 A at 35 °C, derating to 1.86 A at 40 °C, 1.79 A at 45 °C, 1.72 A at 50 °C, and 1.64 A at 55 °C. If the enclosure ambient runs at 45 °C, the breaker is effectively a 1.79 A device — size accordingly. The DC voltage rating maxes at 250 V DC, so a 24 V DC control bus is well within margin, but a 300 V DC bus would exceed the rating.
IP20 with connected conductors — not for wet locations. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz, so it holds up on a machine frame or conveyor section.