The Siemens SENTRON 3VA2063-5HN32-0JC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current with no derating across the full -25 °C to 70 °C operating range — meaning it holds its full 63 A rating even in a warm cabinet, not just at a 40 °C reference point. Breaking capacity runs 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The 86 mm depth and 105 mm width fit standard panel layouts; the shunt trip (STL) and two HQ auxiliary switches ship integrated, so the kit is complete — no separate accessory order needed.
Breaking capacity and thermal performance
The 187 kA at 240 V is the headline number, but the 121 kA at 415 V is what matters for most 400 V-class distribution panels — that's well above typical utility fault levels, so you can use this MCCB as a main breaker without worrying about series rating with downstream devices. At 690 V the capacity drops to 3 kA, which is still adequate for the low-fault end of a 690 V motor circuit. The 63 A rating holds steady from 40 °C through 70 °C ambient; no derating curve to calculate, which simplifies panel thermal budgeting.
Integrated accessories
This variant comes with a shunt trip (STL) for remote tripping and two HQ auxiliary switches for status feedback to a PLC or indicator lamp. The basic switch is the 3VA20635HN320AA0. No undervoltage release, no ground-fault monitoring, no communication module — it's a clean line-protection breaker with remote-trip and status outputs. The 5.4 W maximum power loss is low enough that ventilation slots in the enclosure cover are adequate; no forced cooling required.