The Siemens SENTRON 5SM3316-6 is a 2-pole residual current circuit breaker (RCCB) rated 63 A at 40 °C with 30 mA sensitivity, Type A fault current detection, for 230 V AC 50 Hz systems. Type A detection means it trips on sinusoidal AC residual currents and pulsating DC residual currents up to 6 mA smooth DC — the common waveform from rectified loads like switched-mode power supplies, variable-speed drives, and LED drivers. The let-through energy (I²t) is rated at 70 000 A²·s, and the permissible let-through current is 7 500 A.
Thermal derating and installation
Rated 63 A at both 40 °C and 45 °C ambient. Derating begins at 50 °C: 60.48 A at 50 °C, 57.96 A at 55 °C, 55.44 A at 60 °C, 52.92 A at 65 °C, and 50.4 A at 70 °C. If the distribution board runs warm — say 55 °C inside a sealed enclosure — the continuous load must be capped at 58 A, not the nameplate 63 A. Mounting position is any orientation. Silicon-free construction matters for automotive paint-shop or semiconductor fab environments where silicone outgassing can cause adhesion or contamination failures.