What the ratings mean for fit
The Siemens SENTRON 3VA2063-5HN32-0BL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal budgeting in a crowded enclosure. Its interrupting capacity reaches 187 kA at 240 V AC and 121 kA at 415/440 V, dropping to 75.6 kA at 500 V and 3 kA at 690 V — the 240 V figure is the one that governs for typical North American 480Y/277 V distribution panels where the available fault current at the line side can exceed 100 kA. The breaker is designed for line protection (cable and busbar feeder duty), not motor branch-circuit protection — the 63 A frame and the high interrupting rating align with main or sub-feed applications in industrial switchboards.
Built-in auxiliary and undervoltage release
This variant ships with two auxiliary switches, one trip alarm switch, and one electrical alarm switch (HQ type), plus an undervoltage release (UVR) — a complete signaling and shunt-trip package that eliminates the need for separate add-on modules on the DIN rail. The UVR drops the breaker when control voltage falls below the dropout threshold, which is standard for emergency-stop circuits and undervoltage protection schemes in machine-tool or conveyor lines.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON mounting plates and busbar systems without adapter brackets. The trip indicator is visible through the front cover, and the breaker accepts standard Siemens accessory kits for rotary handles, padlocking, and shunt-trip extensions.