The Siemens SENTRON 5SV3326-4 is a 2-pole Type B residual current circuit breaker (RCCB) rated 63 A with a 30 mA trip threshold, designed for 230 V AC supply. The Type B characteristic means it detects smooth DC residual currents in addition to AC and pulsed DC — critical for variable-speed drives, UPS systems, and PV inverters that can generate DC fault currents a standard Type A or AC device would miss. The short-time delayed (S-type) selectivity prevents nuisance tripping when downstream devices clear a fault first, making it suitable for sub-distribution boards feeding multiple circuits.
Ratings and what they mean for fit
The 10 kA short-circuit current rating (SCCR) per IEC 61008-1 means this RCCB can safely interrupt a fault up to 10 kA without welding contacts or rupturing the enclosure — adequate for most commercial and light-industrial panelboards where the prospective fault current stays under that threshold. The 30 mA sensitivity (IΔn) provides personal protection against direct contact; at 63 A continuous rating, it handles the full load of a submain feeding a workshop or a small production line. The 5 W power loss per pole at rated current in hot operating state is the heat the device dissipates — factor it into your enclosure thermal calculation, especially when mounting multiple units side by side in a confined DIN-rail enclosure.
Mounting and integration
Snaps onto standard 35 mm DIN rail (REG profile), occupying 4 modular width units (72 mm). The 70 mm installation depth matches standard distribution board clearances. IP20 rating with connected conductors means it is protected against finger contact once installed inside a closed panel — standard for switchgear cubicles. Supply can be fed from top or bottom; the SIGRES function (a Siemens feature) keeps the device powered for testing even in the switched-off state when fed from the top. Ambient range from -25 °C to 45 °C covers most indoor industrial and commercial environments.