What the ratings mean for fit
The 5SV3745-8 is a 4-pole residual current operated circuit breaker (RCCB) from the Siemens RCCBs family, rated 125 A at 400 V AC. The type A selective characteristic means it detects sinusoidal AC and pulsating DC fault currents while providing time-delayed tripping — essential for coordination with downstream RCDs in a distribution board, avoiding nuisance trips on transient earth faults. The 500 mA sensitivity suits sub-main or feeder circuits where a lower mA trip would cause unwanted downtime (e.g., supply to a machine cell with natural leakage).
Compliance and documentation
RoHS compliant since June 2023; REACH candidate list information is available on request. Export control is AL: N / ECCN: EAR99 — no special license required for standard commercial shipments.