Siemens 3VA2010-5KP32-0BC0 — 100 A SENTRON MCCB with ETU850 trip unit
It's a line-protection version from the 3VA2 family, meaning it's set up for feeder and main breaker duty rather than motor branch-circuit protection. The 100 A rating holds flat from 40 °C up to 50 °C, then derates to 85 A at 70 °C — useful to know if this lands in a hot panel or a NEMA 12 enclosure with limited airflow. Breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415/440 V, 79 kA at 500 V, and 3.4 kA at 690 V. Power dissipation maxes at 16 W — negligible for panel thermal budgeting unless you're packing a dozen of these in a sealed enclosure.
Trip unit, releases, and auxiliaries
This isn't a basic thermal-magnetic; it's a microprocessor-based unit that gives you adjustable trip curves and remote visibility. The auxiliary contact configuration is 2 HQ auxiliary switches, and the integrated auxiliary trip is a separate orderable module (3VA9608-0BB11). The supplied basic switch is 3VA2010-5KP32-0AA0. No phase failure detection on this variant, and no ground fault monitoring module fitted. The trip indicator is not present, so you won't get a local mechanical flag showing the breaker tripped on fault; you'd rely on the aux contact status or the communication channel.
The 86 mm depth is the overall body depth including the arc chamber; make sure your gland plate or rear-connection cover has clearance for the rear terminals.