What this MCCB is and what it does
The Siemens 3VA2063-5HN32-0BC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 63 A continuous rating that holds flat from 40 °C through 70 °C — no derating needed across that range, which simplifies panel sizing in warm enclosures or near other heat sources. The 3-pole, 756 A maximum/minimum frame handles fault interruption up to 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V is the headline number for high-fault-capacity service entrances or industrial feeders where available fault current is high.
Ratings that matter for panel fit
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — fits standard MCCB mounting footprints in Siemens SENTRON distribution boards or third-party enclosures with the appropriate cutout. The 7.9 W maximum power loss is low enough that internal enclosure temperature rise stays manageable without forced ventilation in most panel layouts. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so it handles cold warehouses and hot plant floors alike.
Built-in undervoltage release and auxiliary switches
This MCCB ships with an undervoltage release (UVR) as the auxiliary release type — it trips the breaker when supply voltage drops below a threshold, protecting motors or sensitive loads from brownout conditions. It also carries two HQ auxiliary switches for remote status indication of the breaker position (open/closed/tripped). The basic switch assembly is order code 3VA20635HN320AA0. No communication function, no ground-fault monitoring, and no voltage trigger are included on this variant.