What it is and what it does
The Siemens SENTRON 3VA1063-4ED36-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, built for line protection in industrial distribution panels. It handles a breaking capacity of 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — numbers that tell you it's sized for high-fault locations like a main feeder or a large motor control center. Insulation voltage is rated 800 V.
Where it fits and how it mounts
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this MCCB drops into a standard Siemens SENTRON panel or any DIN-rail-compatible enclosure — the width is three inches, which is the same footprint as most 3-pole molded-case breakers in this class. It ships with a shunt trip (STL) auxiliary release and carries two auxiliary switches plus one trip alarm switch (HQ), so you can wire it into a remote monitoring or safety circuit without adding a separate accessory block.
Thermal performance and real-world current
The breaker holds its full 63 A rating up to 50 °C ambient. At 55 °C it derates to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A — so if your panel runs hot (say near a furnace or in a non-conditioned space), you still get nearly full-rated current. Maximum power loss is 17.3 W, which is typical for a 63 A MCCB and easy to manage with natural convection in a ventilated enclosure.
Lifecycle and sourcing
Lifecycle stage is current.