What this 63 A SENTRON MCCB carries — and where it sits
The Siemens 3VA1163-5ED32-0JH0 is a 3-pole SENTRON molded case circuit breaker rated for line-protection duty at 63 A continuous current (Iu), with a TM210 thermal-magnetic overcurrent release and an integrated shunt trip (STL) auxiliary release. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — figures that give you headroom for high-fault panels without cascading upstream. The 800 V rated insulation voltage (Ui) keeps it comfortable on 690 V line-side circuits. The front face carries IP40 protection, adequate for enclosed panel mounting where dust ingress is the concern, not washdown.
Thermal derating and what it means for a hot panel
This breaker holds its full 63 A rating from 40 °C through 50 °C ambient. Above that, it derates linearly: 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 sits near a furnace line or in a non-ventilated enclosure pulling 60 °C internal air, you lose roughly 4 A — about 6% — from the nameplate. The operating range tops out at 70 °C, which is the same as the maximum storage temperature; storage alone can go to 80 °C. For a rolling-mill aux panel where radiant heat from the strip is a fact of life, that 56.7 A floor at 70 °C still gives you a solid 60 A feeder without oversizing the frame.
Auxiliary contacts and trip signaling
The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). That gives you two form-C contacts for status feedback to a PLC or annunciator, plus a dedicated alarm contact that changes state only on a trip event — not on manual switching. The integrated shunt trip (STL) release, order code 3VA9688-0BL32, allows remote tripping from an E-stop or safety relay circuit. No undervoltage release, no communication module, no phase-failure detection, and no ground-fault monitoring on this variant — it is a clean, hard-wired thermal-magnetic breaker with a remote-trip option.