The Siemens 5SM3746-6 is a SENTRON 5SM3-series residual current circuit breaker (RCCB), 4-pole, Type A, rated 63 A at 400 V AC. It handles fault currents up to 10 kA and is designed for instantaneous tripping on sinusoidal AC and pulsating DC fault currents — Type A covers standard industrial and commercial loads with electronic components like rectifiers or VFDs. The 63 A rating holds at 40 °C ambient; derate above that per the listed curve (–).
Mounting and integration
Snap-on DIN rail (REG) mount, any orientation. Occupies 4 width units at 72 mm wide, 90 mm tall, 77 mm deep — installation depth 70 mm. Accepts solid or stranded conductors 1.5–25 mm². Supply connection top or bottom. IP20 with distribution board installed and conductors connected.