The Siemens SENTRON 5SV3746-6 is a 4-pole residual current circuit breaker (RCCB), type A, rated 63 A with a 500 mA trip sensitivity and 400 V AC supply voltage. It carries a 10 kA short-circuit current rating and is designed for instantaneous operation — no intentional delay, so it responds to earth faults without coordination lag.
What the ratings mean for fit
The 63 A rating is the continuous current per pole at 400 V AC, 50 Hz. The 500 mA residual sensitivity is on the higher side — suited for circuits with natural leakage (long cable runs, industrial heaters) where a 30 mA device would nuisance-trip. Type A detection covers AC and pulsating DC fault currents, which is the standard for most mixed-load panels. The 10 kA SCCR is the withstand rating under IEC 61008-1; the rated conditional short-circuit current is 0.8 kA per that standard. The maximum permissible series fuse is 100 A — upstream protection must be coordinated to that level. Mechanical life is 10 000 operating cycles typical. Power loss per pole at rated current in hot state is 3.9 W — four poles total about 15.6 W heat dissipation inside the enclosure, which matters for thermal derating in a crowded panel.
Mounting and integration
Occupies 4 modular width units at 60 mm grid spacing — 72 mm wide, 70 mm deep, 90 mm tall. Mounts on DIN rail (REG) in any position. IP20 with the distribution board installed and conductors connected; overvoltage category III. Silicon-free construction, which matters for coating-sensitive environments like automotive paint lines or semiconductor fab sub-panels. Supply connection can be top or bottom. Supplementary devices (auxiliary switches, shunt trips, alarm contacts) can be installed on the unit. Operating temperature range is -25 °C to 45 °C; storage range -40 °C to 75 °C.