The Siemens SENTRON 5SM3346-4KK14 is a 4-pole RCCB rated 63 A at 40 °C and 45 °C, with a 30 mA tripping fault current. It is a Type B+ design with short-time delayed switching.
The headline 63 A holds at 40 °C and 45 °C ambient. Above that, derate linearly: 59.2 A at 50 °C, 55.4 A at 55 °C, 51.7 A at 60 °C, 47.8 A at 65 °C, 44 A at 70 °C (–). The short-circuit current rating is 10 kA, but note the EN 60898 rating is 0.8 kA — that's the IEC standard for RCCBs, not a contradiction. The 10 kA figure is the conditional rating with an upstream MCB or fuse. The let-through energy is capped at 70,000 A²·s, so coordinate with a breaker that clears within that I²t window. Four modular width units at 72 mm wide. Depth is 77 mm, installation depth 70 mm.
What the Type B+ rating actually covers
Type B+ RCCBs are specified where variable-speed drives, UPS systems, or PV inverters create smooth DC fault currents that a standard Type A or AC device won't see. The 30 mA trip threshold is the standard for personnel protection in most IEC territories. The short-time delay prevents tripping on capacitive inrush from long cable runs or input filters — common in industrial panels with multiple drives.