Siemens 5SM3647-4KK14 is a SENTRON RCCB rated 80 A at 40 °C and 45 °C, 300 mA tripping fault current, Type B+.
Top or bottom feed is acceptable, and the SIGRES function remains powered even in the switched-off state if fed from the bottom. Silicon-free construction suits environments where silicone outgassing can contaminate contacts or optics.
Temperature derating is published: the 80 A rating holds at 40 °C and 45 °C, then steps down to 76.8 A at 50 °C, 73.6 A at 55 °C, 70.4 A at 60 °C, 67.2 A at 65 °C, and 64 A at 70 °C (–). The permissible I²t value of 70 000 A²·s and let-through current of 7 500 kA define the energy-limiting performance under fault conditions.