The Siemens SENTRON 5SM3646-5 is a selective Type B residual current circuit breaker (RCCB) — 4-pole, rated 63 A at 40 °C, with a 300 mA tripping threshold and a 10 kA short-circuit current rating. The selective design (time-delayed) means it coordinates with downstream RCCBs: on a fault, the downstream device trips first, leaving this one closed to keep upstream circuits live. That's the difference between losing one branch and losing the whole panel.
Type B detection handles AC, pulsating DC, smooth DC, and high-frequency residual currents. The 300 mA trip threshold is typical for selective RCCBs in distribution boards feeding sub-distribution or fixed equipment. At 50 °C it drops to 60.48 A, at 60 °C to 55.44 A, and at 70 °C to 50.4 A. The EN 60898 rating is 0.8 kA — that's the lower conditional rating under that standard's test sequence, not the interrupting capacity you design to. Use the 10 kA figure for your SCCR label.
Panel integration
Mounting position is any — no restriction on upright or horizontal. The top or bottom feed option means you can bus it either way; the SIGRES function (selective isolation) stays active even with bottom feed in the off state. Silicon-free construction, which matters if this goes into a paint shop or coating line where silicone outgassing causes fisheyes.