What this 63 A MCCB is and what the ratings mean for your panel
The Siemens 3VA2163-5HN36-0KA0 is a SENTRON-series molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C through 70 °C — no derating needed across that ambient span, which simplifies panel thermal budgeting. Its 800 V rated insulation voltage (Ui) means it can sit on a 480 V or 600 V distribution bus with full dielectric margin. The interrupting capacity is the headline number: 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V is a high-fault rating — it clears a bolted fault on a large transformer secondary without the breaker rupturing. The 3.7 kA at 690 V is the weak point; if your system runs 690 V with available fault current above that, this breaker is not the right choice. This variant is designated for line protection — it is not a motor-protective breaker with integrated overload class. It carries a shunt trip release (STL) as the auxiliary release, meaning it can be tripped remotely by applying voltage to the shunt coil. No undervoltage release, no ground-fault monitoring, no communication module on this order code. The physical footprint is 105 mm wide, 181 mm tall, 86 mm deep — a standard 3-pole MCCB form factor that fits most Siemens SENTRON mounting bases and panel cutouts.
Integration and deployment context
Mounts on a DIN rail or directly onto a panel backplate via the SENTRON mounting base. The 3-pole, 63 A frame accepts busbar connectors for a common distribution bus. The shunt trip coil requires a separate control voltage — verify polarity and coil rating against your trip circuit before wiring. The breaker's power loss is rated at 4 W maximum, negligible for enclosure heat rise calculations at this frame size.