What this MCCB carries and what it protects
The Siemens SENTRON 3VA2063-5HN36-0KC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current, with a line protection version that uses an ETU350 electronic overcurrent release. Its breaking capacity reaches 187 kA at 240 V AC, dropping to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 3.4 kA at 690 V — so the interrupting rating is strongly voltage-dependent; at typical 400 V distribution panels it still holds 121 kA, which covers most industrial fault-current scenarios without needing an upstream current-limiting device. The ETU350 release gives you adjustable long-time, short-time, and instantaneous pickup, plus ground-fault alarm or trip if you add the optional module. The shunt trip (STL) integrated auxiliary release lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or supervisory shutdowns. Two auxiliary switches (HQ type) are built in for status feedback to a PLC or annunciator panel.
Panel fit and thermal derating
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA2 frame footprint that fits common MCCB panel cutouts and busbar arrangements. The breaker is rated for 63 A from 40 °C through 50 °C ambient; above that it derates linearly to 53.55 A at 70 °C. If your enclosure runs hot (e.g., adjacent to drives or transformers), check the 55–70 °C column: at 55 °C it still delivers 60.6 A, but at 70 °C you lose nearly 10 A of headroom. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Maximum power loss is 5.4 W per pole — negligible for thermal budgeting in a ventilated panel, but worth noting if the breaker is sealed in a non-ventilated enclosure with other heat sources.