63 A MCCB with TM210 release — what the ratings mean for your panel
The Siemens 3VA1063-3ED32-0CC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. The TM210 designation means the thermal element is fixed at 63 A (the frame rating), while the magnetic short-circuit pickup is adjustable — typically 5–10× In, though the exact range depends on the release variant. This breaker carries 75.6 kA breaking capacity at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V — figures that tell you it can interrupt fault currents up to those levels without upstream coordination failure. The 800 V rated insulation voltage (Ui) confirms it is suitable for 480 V and 600 V class systems as well. The 3VA1063-3ED32-0CC0 includes an integrated undervoltage release (UVR) and two auxiliary switches (HQ type) for status feedback to a PLC or annunciator panel. The UVR trips the breaker when control voltage drops below a threshold — standard practice for emergency-stop circuits or undervoltage protection on motor feeders. The auxiliary contacts are wired separately from the main power path, so they report the breaker's actual mechanical position, not just the trip signal. This MCCB is intended for line protection — meaning it guards the feeder cable and downstream equipment against overloads and short circuits, not a specific motor or load. It mounts on a DIN rail or panel-mount baseplate, occupying 76.2 mm width (roughly 4.5 standard module spaces) and 130 mm height. The IP40 front protection means it is splash-proof from the front but not sealed against dust ingress; install it inside an enclosure rated for the environment.
Thermal derating and ambient temperature
The 63 A rating holds from 40 °C up to 50 °C ambient. Above 50 °C, the breaker must be derated: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your panel runs hot — near a drive cabinet or in a non-climate-controlled enclosure — use the 55 °C or 60 °C column to size the breaker. The storage temperature range is -40 °C to 80 °C, which covers most shipping and warehouse conditions.