MCCB with ETU320 — what the ratings mean for fit
The Siemens 3VA2063-5HL36-0HA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 63 A continuous (Iu) with an ETU320 electronic trip unit. The interrupting ratings tell the real story: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 3.4 kA at 690 V. That 187 kA at 240 V means it can safely clear a fault at the full available short-circuit current of a large industrial service entrance — no cascading failure upstream. At 690 V the 3.4 kA figure reflects the reduced arc-quenching capability at higher voltage; this breaker is sized for 400–500 V distribution, not 690 V main feeds. The ETU320 release provides adjustable thermal and magnetic protection curves, giving the panel designer selectivity headroom downstream. The 63 A rating holds flat from 40 °C to 50 °C ambient, then derates to 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C. In a 50 °C panel enclosure, you get the full 63 A; above that, the derating curve governs continuous load. This variant includes a shunt trip (STL) for remote tripping — the integrated auxiliary trip is order code 3VA9688-0BL30. There is no undervoltage release, no auxiliary contact, no ground-fault monitoring, and no communication function. It is a straightforward line-protection MCCB with a voltage-trigger capability for emergency-off or remote-disconnect circuits.
Panel fit and mechanical data
The 3VA2063-5HL36-0HA0 measures 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame that mounts on a DIN rail or panel-mount plate. The 3-pole footprint matches the 3VA family cutout; if you are replacing a 3VA1010-2ED32-0JA0, the width and depth are identical, so the panel layout does not need rework. Mechanical endurance is rated at 20,000 operations. Maximum power loss is 5.4 W, which is negligible for enclosure thermal budgeting.