It is rated at 63 A continuous current with a 1000 mA tripping fault current — meaning it protects against sinusoidal AC residual currents and pulsating DC residual currents up to 1000 mA, with a deliberate delay to coordinate with downstream RCCBs and avoid nuisance tripping on transient earth faults. The selective characteristic (short-time delayed) makes this the right choice for the upstream position in a distribution board where you need discrimination with downstream 30 mA or 300 mA devices.
The 63 A rating at AC is the headline number, but the real-world current capacity drops with ambient temperature: at 40 °C it carries 58.6 A, at 45 °C it carries 58.59 A, and at 70 °C it derates to 50.4 A. The 1000 mA tripping threshold is high enough to avoid nuisance trips on leakage from VFDs or UPS filters, but still provides personnel protection for the distribution feeder — this is not a 30 mA final-circuit device. Overvoltage category III means it is rated for fixed-installation distribution boards, not for downstream equipment.
Snap-on mounting to DIN rail (REG fastening method), installable in any position. The 4-pole unit occupies 3 modular width units (each 18 mm, so 54 mm total width on the rail). Depth is 77 mm, installation depth 70 mm — verify clearance to the enclosure door or cover. The RC unit is designed for the 5SY series of MCBs, so it clips directly to the 5SY busbar system for a compact feeder assembly.