Type A means it catches both sinusoidal AC ground faults and pulsating DC faults, which is what you need on variable-speed drives, washing machines, or any load with rectified current. The 30 mA trip threshold is the standard for personal protection against lethal shock. Rated 230 V AC, it handles residential and light commercial single-phase supplies.
Thermal derating — the real-world current limit
That's unusual — most breakers start derating at 40 °C. At 65 °C it drops to 56.96 A, and at 70 °C to 48.19 A. If your panel sits near a hot motor or a sunny wall, the 63 A nameplate holds until you cross 60 °C.
Mounts on DIN rail (REG), 36 mm wide — that's 2 width units. Depth is 70 mm, same as the installation depth, so it sits flush with other SENTRON modular devices. That's a wide range: 0.75 mm² is fine for control wiring, 35 mm² handles the full 63 A load without needing a reducer. Supply can come from top or bottom.