What the ratings mean for your panel
The Siemens SENTRON 3VA1050-2ED42-0JC0 is a 4-pole molded case circuit breaker rated for 50 A continuous current at 40 °C through 50 °C, derating to 45 A at 70 °C. That full-load rating holds steady across typical panel ambient — you don't lose headroom until the enclosure runs hot. The interrupting ratings tell the real story: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. At 415 V, that 32 kA SCCR covers most industrial distribution panels behind a typical transformer; the 690 V figure matters for mining or marine switchgear where line-to-line voltage is higher. The TM210 thermal-magnetic release handles overload and short-circuit protection in one package — no separate relay needed for the line side.
Built-in shunt trip and auxiliary contacts
This version ships with a shunt trip (STL) auxiliary release for remote tripping, plus 2 HQ auxiliary switches for status feedback to a PLC or indication lamp. No undervoltage release, no ground-fault monitoring, no communication module — it's a straightforward line-protection breaker with remote-trip capability. The auxiliary contacts share the same form factor as the breaker body, so they don't add panel depth. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress — keep it inside a sealed enclosure for washdown areas.