What it is and what it does
The Siemens SENTRON 3VA1063-3ED36-0AE0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — the main disconnect and fault interrupter in a distribution panel or motor control center. It carries 63 A continuously at 40 °C ambient, with a TM210 thermal-magnetic release that handles overload and short-circuit trip curves without external power. Breaking capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — enough to clear a hard fault on a 440 V bus without upstream coordination headaches.
Ratings and what they mean for fit
The 63 A rating holds from 40 °C up to 50 °C without derating; at 55 °C it drops to 62 A, and at 70 °C it's 58 A. If the panel ambient runs hot, check the thermal curve before sizing. Insulation voltage is rated 800 V, so the breaker is comfortable on 480/277 V or 600 V systems with headroom. The TM210 release is a fixed thermal-magnetic type — no electronic adjustment, no communication module. It trips on thermal overload and magnetic short-circuit; if you need adjustable long-time or short-time pickup, you'd step up to an electronic-trip variant. It ships with provision for up to four auxiliary switches (HQ type) but no undervoltage release or ground-fault monitoring built in. Those are add-on accessories if the spec requires shunt trip or GF protection.
Where it goes in the panel
Footprint is 76.2 mm wide, 130 mm tall, 70 mm deep — a standard 3-pole MCCB form factor that fits most DIN-rail or panel-mount enclosures without re-drilling. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. If the breaker sits in an unconditioned warehouse or outdoor enclosure, the storage range is the one that governs handling before installation. Power loss is 17.3 W maximum at rated load — negligible for thermal budgeting in a typical panel, but worth noting if you're packing multiple breakers in a sealed enclosure.