What this MCCB delivers for the panel
The Siemens SENTRON 3VA2010-5HL36-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection at a continuous 630 A. That 630 A figure holds at 40 °C ambient; derate to 520 A at 70 °C if the panel runs hot. Breaking capacity reaches 187 kA at 240 V AC and 121 kA at 415/440 V — enough to clear a high-fault utility feed without upstream coordination headaches. The built-in undervoltage release (UVR) drops the breaker if control power fails, which matters for safety circuits that need a predictable trip on loss of 24 V or 110 V control voltage.
Sizing and thermal derating
This MCCB occupies 138 mm width, 248 mm height, and 110 mm depth on the panel backplate — a standard 3-pole SENTRON 3VA footprint that fits existing busbar and lug layouts. The ETU320 electronic trip unit provides LI (long-time and short-time) protection curves. At 630 A continuous, expect 164.5 W of power loss at full load; account for that heat in the enclosure sizing, especially in a sealed cabinet where derating already applies.