63 A MCCB with 52.5 kA interrupting capacity — line protection for main feeders
The Siemens SENTRON 3VA1063-2ED46-0AA0 is a 4-pole molded case circuit breaker rated 63 A at 40 °C, carrying a TM210 thermal-magnetic release for line protection. Its interrupting capacity reaches 52.5 kA at 240 V, 32 kA at 415 V, and 7.5 kA at 690 V — figures that govern selectivity coordination in a distribution board feeding motor control centers or downstream sub-distribution. The TM210 release is non-adjustable for I²t, meaning the thermal and magnetic trip points are fixed at the factory. This suits applications where the load profile is well-defined — a main incomer for a fixed load bank, a feeder to a constant-torque conveyor group, or a transformer primary protection where coordination studies are already locked. Rated insulation voltage is 800 V, and the breaker carries IP40 protection on the front — adequate for enclosed panel mounting where the front face is behind a door. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it survives cold warehouses and hot switchrooms without derating the storage spec.
Current derating and thermal budget
The 63 A rating holds flat from 40 °C through 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. Maximum power loss is 17.3 W — a figure to include in the enclosure thermal calculation when grouping several breakers in a confined panel.
Panel fit and physical integration
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth. The 4-pole width of roughly 100 mm is standard for a 4-pole MCCB in this frame size. No undervoltage release, no shunt trip, no communication function — it is a plain thermal-magnetic breaker with no auxiliary electronics, which simplifies wiring but means remote trip or status feedback requires an external accessory.