What this MCCB carries and where it fits
The Siemens SENTRON 3VA2063-5HN32-0DC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) with an ETU350 electronic trip unit configured for line protection. Its interrupting capacity reaches 187 kA at 240 V AC and 121 kA at 415 V AC — sufficient for high-fault utility feeds or transformer secondaries in industrial distribution. The breaker carries an undervoltage release (UVR) and two auxiliary switches (HQ type) factory-integrated, so it drops out on loss of control voltage and reports its status back to the PLC or panel indication without adding external relays. Rated insulation voltage is 800 V, and the unit measures 105 mm wide by 181 mm tall by 86 mm deep — a standard SENTRON 3VA frame that fits the same DIN-rail or screw-mount footprint as other 3VA breakers in this class.
Thermal derating and real-world current
The 63 A rating holds at ambient temperatures up to 50 °C. Above that, current must be derated: 60.6 A at 55 °C, 58.3 A at 60 °C, 55.9 A at 65 °C, and 53.6 A at 70 °C. If the panel runs hot — say, a crowded enclosure near a furnace line — the actual load must stay under the derated curve.
Interrupting capacity across voltages
The interrupting ratings drop as system voltage rises: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 3.4 kA at 690 V. At 690 V the breaker is still usable for low-fault-resistance circuits, but verify the available fault current at the point of installation.