The Siemens 5SV3654-6 is a SENTRON residual current circuit breaker (RCCB), 4-pole, Type A, rated 40 A with a 300 mA residual operating current and 500 V AC supply voltage.
Depth is 70 mm, matching the installation depth of most SENTRON MCBs and RCCBs, so it aligns flush in a mixed row. Protection class is IP20 with the distribution board installed and conductors connected — standard for enclosed panel use. Supplementary devices (like auxiliary switches or shunt trips) can be installed on the side, and the unit is silicon-free, which matters for potting or conformal-coating compatibility in harsh-environment builds.
The conditional short-circuit current with a 63 A series fuse (maximum permissible) is 0.8 kA — that is the rating when backed by an upstream MCB or fuse, which is the typical installation. Power dissipation is 1.8 W per pole at rated current in hot operating state — 7.2 W total for the 4-pole unit. Overvoltage category III (distribution level) confirms suitability for fixed-installation downstream of the utility meter.