MCCB with ETU320 — line protection for high-fault panels
The Siemens SENTRON 3VA2063-6HL32-0DH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) and a rated insulation voltage of 800 V. Its ETU320 electronic trip unit provides line protection with adjustable overload and short-circuit curves, and the integrated undervoltage release (UVR) trips the breaker when control voltage drops — typical for emergency-stop or undervoltage lockout circuits. The 242 kA breaking capacity at 240 V (187 kA at 415 V, 121 kA at 500 V, 4 kA at 690 V) means this breaker can safely interrupt very high fault currents without upstream fuses in most LV distribution panels.
Selectivity and coordination in the panel
The 3VA2063-6HL32-0DH0 carries 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) for remote status feedback to a PLC or SCADA. The 105 mm width and 86 mm depth fit standard SENTRON mounting footprints — it installs on a DIN rail or direct panel mount. For a panel builder: the 63 A rating holds through 50 °C ambient without derating; at 55 °C it derates to 60.6 A, at 70 °C to 53.6 A. Maximum power loss is 7.9 W, so ventilation planning is straightforward in a standard enclosure.