What this 63 A SENTRON MCCB does in a panel
The Siemens 3VA2063-5HM46-0AL0 is a 4-pole molded case circuit breaker from the SENTRON family, rated 63 A continuous current at 40 °C through 70 °C — no derating needed across that span, which simplifies panel thermal budgeting. It carries an ETU330 electronic trip unit with adjustable long-time delay (tr min 0.5 s, tr max 17 s) and adjustable N-conductor protection (OFF or 100%). The interrupting ratings are the headline: 187 kA at 240 V, 121 kA at 415 V and at 440 V, 76 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V means it can clear a massive fault on a low-voltage distribution bus without upstream fuses needing to open — a selectivity advantage for high-fault service-entrance panels.
Dimensions and panel fit
The breaker measures 140 mm wide, 181 mm high, and 86 mm deep. At 5.5 in wide, it fits a standard 4-pole MCCB footprint on a DIN rail or panel-mount base. The IP40 rating on the front means it is protected against tools and solid objects larger than 1 mm — typical for a distribution board interior, but not for washdown environments. Ground fault monitoring is built in via summation current formation of L + N conductors, which saves adding an external GF relay for grounded-neutral systems.
Trip unit and protection settings
The ETU330 electronic release provides adjustable long-time pickup and delay, plus fixed short-time and instantaneous settings typical of a line-protection MCCB. The N-conductor protection can be set to OFF or 100% of the phase rating, which is useful for panels feeding mixed single-phase and three-phase loads where the neutral may carry near-phase current. Power loss is 5.4 W maximum — negligible for thermal coordination in a crowded enclosure. Latching endurance is rated at 20 000 operations, which is standard for a distribution breaker not cycled daily.