The Siemens SENTRON 5SV3446-8LA is a 4-pole residual current circuit breaker (RCCB) from the 5SV3 series, rated at 63 A continuous at 40 °C ambient. Rated short-circuit current withstand is 10 kA per the spec, with an I²t let-through of 110 000 A²·s and surge current resistance rated at 5 kA. The design includes thermal overload protection.
Snap-on DIN rail (REG) mounting, 72 mm wide (4 width units), 90 mm tall, 70 mm deep. Mounting position is any orientation. The continuous current rating holds at 63 A up to 60 °C ambient; at 65 °C it derates to 57.35 A, and at 70 °C to 48.84 A.