The Siemens SENTRON 3VA2063-5HL36-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It's designed for line protection in distribution panels where you need a fixed thermal-magnetic trip and a healthy interrupting rating: 187 kA at 240 VAC, 121 kA at 415/440 VAC, 75.6 kA at 500 VAC, and 3 kA at 690 VAC. That 187 kA figure at 240 V means it can handle high-fault scenarios common on the secondary side of large step-down transformers without cascading upstream.
Panel fit and integration
The 3VA2063-5HL36-0JH0 measures 105 mm wide, 181 mm tall, and 86 mm deep. That 105 mm width on a 3-pole frame means it fits standard Siemens SENTRON mounting bases and busbar systems — no custom drilling. It ships with a shunt trip (STL) auxiliary release and a built-in trip indicator plus voltage trigger, plus 2 auxiliary switches and 1 trip alarm switch (HQ type). That switch complement is enough to signal the breaker state back to a PLC or annunciator without adding an external relay bank. Operating range is -25 °C to 70 °C ambient; storage from -40 °C to 80 °C.
Maximum power dissipation is 5.4 W at rated load — negligible for thermal budgeting in a crowded enclosure, but worth noting if you're packing a dozen breakers in a sealed box. The continuous current rating holds at 63 A from 40 °C through 70 °C ambient; that's a flat derating curve, meaning you don't have to recalculate for a warm panel. Minimum trip setting is 95 A, maximum 756 A on the magnetic instant trip — wide adjustment range for coordinating with downstream breakers.