63 A SENTRON MCCB with ETU320 — line protection, 187 kA interrupting capacity
The Siemens SENTRON 3VA2063-5HL36-0AE0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) and fitted with an ETU320 electronic trip unit. It is configured for line protection — no undervoltage release, no ground-fault monitoring, no communication module. The interrupting capacity reaches 187 kA at 240 V and holds at 121 kA through 440 V, then drops to 79 kA at 500 V and 3.4 kA at 690 V. That SCCR headroom at the lower voltages makes this breaker a strong candidate for high-fault utility or transformer-fed service entrances where coordination with upstream gear matters. The ETU320 is a basic electronic trip unit — it provides adjustable overload and short-circuit protection without the phase-failure detection or communication functions of higher-tier ETUs. For a panel that needs a reliable, no-frills line-side breaker with a proven trip curve, this is the right fit. The 4 HQ auxiliary switches give you four form-C contacts for status feedback to a PLC or annunciator, which is more than the standard 1NO+1NC on many MCCBs.
Thermal derating and mounting — panel integration notes
The breaker is rated for 63 A from 40 °C through 50 °C ambient. At 55 °C it derates to 60.6 A, at 60 °C to 58.3 A, at 65 °C to 55.9 A, and at 70 °C to 53.6 A. If the panel ambient runs above 50 °C, size the upstream conductor and downstream load for the derated value, not the nameplate 63 A. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA frame size that fits the usual DIN-rail or mounting-plate footprint. Front protection is IP40, meaning it is protected against tools and wires >1 mm but not against water ingress; keep it inside a sealed enclosure if washdown is present. Maximum power loss is 5.4 W, negligible for thermal budgeting in a typical panel.