The Siemens 3VA2010-5JQ32-0AC0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current (Iu) across a 40 °C to 50 °C ambient, derating to 85 A at 70 °C. It is a 3-pole line-protection device fitted with an ETU560 electronic trip unit — the same platform used across the 3VA2 frame for precise, adjustable overload and short-circuit protection. Breaking capacity reaches 187 kA at 240 V and holds 121 kA at 415/440 V, then drops to 79 kA at 500 V and 3.4 kA at 690 V, so the SCCR you need for the fault-current study governs the voltage tap you land on.
The 100 A frame with the ETU560 release handles motor feeders, distribution sub-mains, and transformer protection where adjustable long-time, short-time, and instantaneous pickup is needed. The electronic trip gives better coordination selectivity than a thermal-magnetic on high-fault systems. Communication function is onboard — the ETU560 supports the SENTRON communication-capable accessory interface for remote monitoring and trip-data retrieval, which matters if the panel is wired for a BMS or power-management system. The two auxiliary switches (HQ version) provide status feedback without an add-on module.
Integration notes
Maximum power loss is 13.5 W — account for that in the thermal budget of a densely packed panel.