What this MCCB is and what it does
The Siemens SENTRON 3VA2063-5HN32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across an ambient temperature range from -25 °C to 70 °C — no derating needed up to the full 70 °C, which simplifies panel design in warm enclosures. Its interrupting capacity is 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V is the headline number — it tells you this breaker handles high-fault scenarios at low voltage without needing a current-limiting fuse upstream. At 415 V the 121 kA still covers most industrial distribution panels. This variant is designed for line protection (cable/feeder protection), not motor protection — so it's the right choice for a main or distribution breaker in a panel feeding downstream branch circuits. It includes an undervoltage release (UVR) that trips the breaker when supply voltage drops below a set threshold, which is useful for safety circuits or preventing automatic restart after a power loss.
Auxiliary switching and trip indication
The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type), giving you remote status feedback for open/closed and tripped conditions. The trip indicator is mechanical — visible on the front of the breaker even without power. No communication function is built in; this is a conventional thermal-magnetic or electronic-trip MCCB, not a smart breaker with Modbus or PROFINET.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep. That 105 mm width is standard for a 3-pole SENTRON 3VA2 frame — it mounts on a DIN rail or can be screw-mounted to a backplate. The 86 mm depth means it fits in shallow enclosures where a deeper MCCB would hit the door or gland plate. Power loss is rated at 7.9 W maximum — low enough that you don't need forced ventilation in most panels, but worth checking if you're packing multiple breakers in a small enclosure at elevated ambient.
Lifecycle and sourcing reality
The base switch variant is 3VA20635HN320AA0 — the -0BH0 suffix adds the specific auxiliary switch and undervoltage release configuration. Mounting footprint and bus-bar spacing are consistent across the 3VA2 series.