What this 3VA2063-5HN36-0AF0 is and what it does
The Siemens 3VA2063-5HN36-0AF0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries a rated continuous current Iu of 63 A across three poles, with an ETU350 electronic trip unit that gives you adjustable overload and short-circuit protection curves. That means you're not locked into a fixed thermal-magnetic response — you can dial in the trip characteristics to coordinate with downstream breakers and protect branch circuits without nuisance trips.
Interrupting capacity — what the numbers mean for your panel
The interrupting ratings on this breaker are serious: 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 means it can safely clear a fault current nearly three times what most residential services see — this is a breaker for industrial mains or high-fault sub-distribution where the available short-circuit current is well above what a standard MCCB handles. The drop to 3.4 kA at 690 V tells you it's optimized for the 240–500 V range; at 690 V you need to verify your fault current stays under that ceiling.
Thermal derating — the real continuous current in your environment
This breaker is rated at 63 A continuous from 40 °C up through 50 °C ambient. That's your baseline. At 55 °C it derates to 60.6375 A, at 60 °C to 58.275 A, at 65 °C to 55.9125 A, and at 70 °C to 53.55 A. If you're stuffing this into a crowded panel that runs hot — say 55–60 °C near the top — you lose about 5–8 A of headroom. Plan your load accordingly; don't just spec the 63 A nameplate and forget the ambient.
Physical fit and mounting
Dimensions: width 105 mm, height 181 mm, depth 86 mm. That's a 105 mm wide footprint — three-pole MCCB standard, but measure your existing bus or mounting plate before you assume it drops into a panel cut for a different brand. The front face carries an IP40 protection class, so it's fine for dry indoor panels but not for washdown areas. It ships with one auxiliary switch and one trip alarm switch (HQ type) for remote status indication.