The Siemens SENTRON 3VA2063-5KP32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Its interrupting capacity hits 187 kA at 240 V AC and 121 kA at 415/440 V, dropping to 3 kA at 690 V. That 187 kA figure at 240 V means it can clear a fault at the full available short-circuit current of a large step-down transformer without upstream fuses needing to intervene — a real space-saver in a high-fault panel.
Integration and fit
The 3VA2063-5KP32-0DC0 measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON panelboard and enclosure cutouts without rework. The built-in undervoltage release (UVR) and communication function mean it can be wired into a safety circuit that drops the breaker on loss of control voltage, and it can report status to a PLC or BMS over the integrated comms link. Power loss is 7.9 W maximum, which keeps heat rise manageable in a densely packed enclosure.
What the interrupting ratings mean for selectivity
The 187 kA at 240 V and 121 kA at 415 V are the breaker's ultimate short-circuit breaking capacity (Icu) — the maximum fault it can safely interrupt once. For selectivity studies, pair this MCCB with a downstream 65 kA-rated feeder breaker: the 3VA2063's high Icu gives you headroom to coordinate so only the faulted branch opens, not the main. At 690 V the rating drops to 3 kA, so on 690 V systems this breaker is for load protection only, not main service entrance duty.