The Siemens 5SM3652-6 is a SENTRON residual-current circuit breaker (RCCB) — 4-pole, Type A instantaneous trip, rated 25 A at 40 °C and 300 mA residual current. The 300 mA trip threshold is typical for general distribution protection rather than personnel shock protection (which would be 30 mA); this is sized for equipment and fire-prevention protection on submain or feeder circuits.
Installation depth matches the 70 mm dimension — verify your enclosure depth clears the body with conductors dressed. Any mounting position permitted. Supply connection at top or bottom.
Rated 25 A at 40 °C and 45 °C; derates to 24 A at 50 °C, 23 A at 55 °C, 22 A at 60 °C, 21 A at 65 °C, 20 A at 70 °C. Operating ambient -25 °C to +45 °C; storage -40 °C to +75 °C. The derating curve is the selection gate for panels running warm — if your enclosure ambient sits at 60 °C, the continuous load limit drops to 22 A.