What this MCCB is and what it protects
The Siemens SIRIUS 3RV1363-7AN10 is a molded-case circuit breaker (MCCB) designed specifically for starter combinations — meaning it's sized and coordinated to sit ahead of a contactor and overload relay in a motor branch circuit, not as a standalone feeder breaker. It carries a continuous rated current of 100 A and, in AC-3 duty at 400 V, delivers 100 A operational current for motor loads up to 55 kW. The 120 kA breaking capacity at 400 V AC means it can safely interrupt a fault current of that magnitude without the arc propagating upstream — critical for panel SCCR compliance when the available fault current at the panelboard is high.
Key ratings and what they mean for fit
The 100 A continuous rating sets the thermal limit for the main circuit — this breaker is sized for a 100 A feeder or a motor branch where the full-load current stays under that ceiling. The AC-3 rating at 400 V (100 A) tells you it's rated for switching induction motors under starting and running conditions, not just resistive loads. The electronic short-circuit trip gives faster response and better selectivity than a thermal-magnetic trip unit, especially on low-level faults where a bimetallic strip might coast. Surge voltage withstand of 8,000 V covers the impulse levels expected in industrial distribution (typically 6 kV impulse for 400 V systems, so this provides margin). IP20 on the front means finger-safe from the panel face but not protected against water ingress — mount inside a suitable enclosure.
Mounting and integration
Fastening is by screw fixing — this is a panel-mount device, not DIN-rail snap-on. Mounting position is any, so it can be oriented vertically, horizontally, or flat without derating the thermal trip. The dimensions — 205 mm height, 105 mm width, 103.5 mm depth — fit a standard MCCB footprint. Clearance requirements: 0 mm backwards, 0 mm at the side, meaning it can be mounted flush against the back panel and side-by-side with adjacent devices without additional air gap for arc quenching. The screw-type terminals on both main and auxiliary/control circuits accept standard lug or ring-terminal connections.
Compliance and environmental
Substance prohibition date of 01/08/2008 aligns with RoHS compliance — the part is RoHS-compliant as manufactured after that date. The operating temperature range of -25 to +70 °C and storage/transport range of -40 to +70 °C cover most industrial environments. Installation altitude limited to 2,000 m above sea level without derating; above that, dielectric strength and cooling are reduced. Shock resistance of 12g for 11 ms means it survives handling and transport shocks typical in panel shipping. Touch protection is finger-safe, meeting the requirements of IEC 60529 for IP2X protection against accidental contact.