63 A MCCB for line protection — what the ratings mean
The Siemens SENTRON 3VA2063-5HN36-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, with a flat derating curve from 40 °C through 70 °C — meaning it holds full 63 A across the entire typical panel ambient range without needing to upsize the frame for temperature. Breaking capacity is 187 kA at 240 VAC, 121 kA at 415/440 VAC, 75.6 kA at 500 VAC, and 3 kA at 690 VAC — the 187 kA figure at 240 V tells you this breaker handles high-fault-current utility feeds or transformer secondaries without cascading upstream. The 86 mm depth and 105 mm width fit standard SENTRON 3VA panel cutouts; the 181 mm height leaves clearance for busbar connections and auxiliary wiring.
Built-in accessories and release options
Shipped with a shunt trip (STL) release for remote tripping, plus two auxiliary switches and one trip alarm switch (HQ configuration) — enough for status feedback to a PLC or alarm annunciator without an external relay interface. The basic switch assembly carries order code 3VA20635HN360AA0; the breaker itself includes a voltage trip indicator and a mechanical trip indicator on the front face. No undervoltage release, no ground-fault monitoring, and no communication function on this variant — it is a straight line-protection MCCB with shunt trip and aux contacts.
Lifecycle and sourcing posture
Power loss is rated at 5.4 W maximum — negligible for panel thermal budgeting, but worth noting if the enclosure is densely packed with multiple breakers.