What this MCCB delivers — and what it doesn't
The Siemens SENTRON 3VA1063-3ED36-0CC0 is a 3-pole molded case circuit breaker (MCCB) sized for line protection, with a rated continuous current Iu of 63 A and a TM210 thermal-magnetic overcurrent release. The TM210 is a fixed thermal, fixed magnetic trip — no interchangeable rating plugs, no electronic adjustments. What you see is what protects the feeder. Breaking capacity tracks the system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. At 415 V — the most common industrial distribution level — this MCCB clears a 52.5 kA fault without cascading upstream, which is the figure that decides whether it holds or the main breaker trips.
Thermal derating — the real continuous current
The 63 A rating holds from 40 °C through 50 °C. Above that, the TM210 release derates: 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 the panel ambient runs hot — say, next to a VFD cabinet or a transformer — size the load at the derated value, not the nameplate 63 A.
Built-in undervoltage release — no separate module needed
This variant ships with an undervoltage release (UVR) integrated, design code 3VA9608-0BB24. That means the MCCB trips if control voltage drops below the UVR dropout threshold — standard for safety circuits that need to drop a feeder on loss of control power. No external shunt-trip wiring required. The auxiliary contact version is 2 HQ switches (form C), enough to signal status back to a PLC or indicator lamp.
Panel fit and mounting
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width is a 3-pole MCCB standard footprint — fits a standard DIN-rail or panel-mount base. Front IP40 protects against tools and fingers; the interior is not sealed, so mount away from washdown zones.