What the ratings mean for the panel
The Siemens 3VA2063-6HL46-0AA0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C through 70 °C — no derating needed across that span, which simplifies panel thermal budgeting. Its ETU320 electronic trip unit gives you adjustable time-delay settings (tr min 0.5 s, tr max 17 s) and an N-conductor protection that can be set to OFF or 100 % of the phase rating. The interrupting ratings are what decide the fit: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. That 242 kA figure at 240 V means it handles high-fault utility feeds without upstream fuses — a common requirement on large commercial or industrial service entrances. The 187 kA at 415 V covers most European LV distribution. At 690 V the 3 kA limit is the binding constraint for 690 V drives or wind-turbine circuits; verify the available fault current at that voltage before specifying.
Panel integration and footprint
The breaker measures 140 mm wide, 181 mm high, and 86 mm deep. That 86 mm depth is shallow enough to fit a standard 200 mm deep enclosure with room for wiring gutters. The IP40 front protection means it's suitable for dry indoor panels — no washdown rating, so keep it out of wet zones. The 5.4 W maximum power loss matters for thermal rise calculations in a sealed enclosure; at 63 A continuous that's under 0.1 W per amp, so natural convection in a properly sized cabinet handles it. The 20 000 mechanical endurance cycles are typical for an MCCB in a distribution role — not a switching-duty device, but fine for infrequent manual operation or remote shunt-trip use.
Selectivity and coordination notes
The ETU320 release is a basic electronic trip unit — no communication function, no ground-fault monitoring. It gives you long-time and short-time pickup and delay adjustment, which is enough for selective coordination with downstream breakers in a radial distribution. The 800 V rated insulation voltage (Ui) covers 690 V systems with margin. The N-conductor protection can be switched off entirely or set to 100 % of the phase rating, which is useful on 4-wire systems where you want to protect the neutral against harmonic currents without nuisance tripping on unbalanced loads.