What this MCCB is and what it does
The Siemens 3VA2063-5HN36-0BA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. Three poles, rated 63 A continuous at 40 °C, and it holds that rating all the way up to 50 °C — no derate needed until you cross 55 °C, where it steps down to 60.6 A, then 58.3 A at 60 °C, 55.9 A at 65 °C, and 53.6 A at 70 °C. That's a solid thermal curve for a panel that runs warm. The interrupting ratings are the headline here: 187 kA at 240 V, 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 is high — this breaker can sit upstream of a large transformer or a high-fault panel without needing a current-limiting fuse ahead of it. The 121 kA at 415 V covers most European industrial distribution. At 690 V the interrupting drops sharply to 3.4 kA, so if you're on a 690 V system, verify the available fault current is below that. The overcurrent release is an ETU350 electronic trip unit — that's the adjustable kind, so you can set the long-time pickup and short-time delay to coordinate with downstream breakers. No communication function, no phase failure detection, no ground fault monitoring on this variant. It's a straightforward line-protection breaker with an undervoltage release (UVR) built in. The UVR means if the control voltage drops, the breaker trips — common for emergency-stop circuits or undervoltage protection on motor feeders.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That width is standard for a 3-pole SENTRON 3VA2 frame — it will drop into the same mounting footprint as other 3VA2 breakers of this frame size. No auxiliary contacts come with this order code, so if you need a status feedback signal, you'll add the auxiliary trip block (order code 3VA9608-0BB11) separately. The basic switch assembly is listed as 3VA2063-5HN36-0AA0, which is the internal switching mechanism. Power loss is 7.9 W maximum at rated current — modest for a 63 A frame, so ventilation requirements in the enclosure are minimal. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The latching endurance is rated at 20,000 operations, which is typical for a distribution breaker not cycled frequently.