What this MCCB delivers — and what the ratings mean for your panel
The Siemens SENTRON 3VA1163-4EF36-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection in distribution panels. Its continuous current rating holds at 63 A from 40 °C through 50 °C ambient, then derates to 58 A at 70 °C — a thermal curve you can rely on for panel sizing without headroom guesswork. The breaking capacity is the headline figure for fault coordination: 121 kA at 240 V, 75.6 kA at 415 V, and still 11.9 kA at 690 V. That means this breaker can safely interrupt a bolted fault at the low-voltage main up to 121 kA, which covers most secondary-side transformer faults without requiring a current-limiting upstream device. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V line-to-line systems with margin on the insulation coordination per IEC 60947-2.
Built-in auxiliaries and release — what's on board
This variant ships with an undervoltage release (UVR) and a factory-fitted auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). The UVR ensures the breaker trips on loss of control voltage — standard for emergency-stop chains or undervoltage protection schemes where you need the load disconnected when the control supply drops. A trip indicator is present, giving a local mechanical flag that the breaker has opened on fault rather than manually. The breaker does not include a communication module or ground-fault monitoring — it's a straight line-protection device with the auxiliaries you'd expect for remote status and undervoltage control.
Physical fit and panel integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard SENTRON 3VA frame size that fits the usual DIN-rail or mounting-plate footprint in distribution boards. The 70 mm depth is shallow enough for most 200 mm deep enclosures without crowding the gland plate. Maximum power loss at rated current is 19.8 W — a figure to include in your enclosure thermal calculation, especially if multiple breakers are ganged in a sealed cabinet.