What this MCCB is and what the ratings mean
The Siemens 3RV1363-7CN10 is a SIRIUS molded-case circuit breaker (MCCB) designed specifically for starter combinations — meaning it integrates with a contactor and overload relay to form a coordinated motor-starting assembly. Its 160 A continuous current rating and 120 kA breaking capacity at 400 V AC tell you this part handles heavy motor loads while safely interrupting high fault currents upstream of the starter. The AC-3 operational current of 160 A at 400 V confirms it is rated for the inductive switching duty of squirrel-cage motors — the standard motor-starting category under IEC 60947-2. The 90 kW motor power at 400 V gives a quick sizing reference for a typical 4-pole induction motor on a 400 V three-phase line. With an IP20 front, it is finger-safe for panel mounting but needs enclosure protection against liquids and dust.
Breaking capacity across voltages — selectivity planning
This MCCB's short-circuit breaking capacity varies by line voltage: 100 kA at 240 V AC, 120 kA at 400 V AC, 85 kA at 500 V AC, and 70 kA at 690 V AC. The 120 kA at 400 V is the headline figure, but when you are coordinating with an upstream feeder breaker on a 690 V system, the 70 kA limit governs selectivity. The electronic short-circuit trip provides adjustable magnetic thresholds — useful for coordinating with downstream contactors and avoiding nuisance trips during motor inrush. The surge voltage resistance of 8,000 V adds margin for transient overvoltages common in industrial networks.
Mounting and integration — panel builder notes
Screw fixing to the mounting plate — no DIN rail adapter on this frame size. Dimensions: 205 mm height, 105 mm width, 103.5 mm depth. Zero clearance required at the back and sides, so it can be packed tight against adjacent devices. Mounting position any — horizontal or vertical orientation allowed without derating. Screw-type terminals on both the main current circuit and auxiliary/control circuit. Accepts auxiliary switch expansion. Installation altitude max 2,000 m; above that, derate per IEC 60947-2. The shock resistance of 12g / 11 ms suits it for machine-mounted applications with moderate vibration.