Siemens 3VA2010-5KP32-0BC0 — 100 A SENTRON MCCB with ETU850 trip unit
The Siemens SENTRON 3VA2010-5KP32-0BC0 is a 3-pole molded case circuit breaker rated for 100 A continuous current, built around the ETU850 electronic 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. That 187 kA at 240 V is a high-interrupting rating — this breaker can sit ahead of a transformer or on a high-fault service entrance without needing a current-limiting fuse upstream. The 121 kA at 415 V covers most European industrial distribution panels. At 690 V the rating drops sharply to 3.4 kA, so if you're on a 690 V system this is not your main breaker; it's a downstream feeder where the available fault current is known to be low. Rated insulation voltage is 800 V, so the internal clearances and creepage are sized for 690 V systems with margin. 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
The ETU850 is an electronic trip unit with communication and other measurement functions onboard — it can report current draw and event data if the breaker is wired into a higher-level monitoring system. This isn't a basic thermal-magnetic; it's a microprocessor-based unit that gives you adjustable trip curves and remote visibility. The breaker ships with an undervoltage release (UVR) fitted, design code 5KP32. 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. Mechanical endurance is rated at 20,000 operations — typical for a molded case breaker in distribution duty. 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.
Physical fit and environment
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That's a standard 3-pole MCCB footprint for the 100 A frame size — it fits the same panel cutout and busbar spacing as other SENTRON 3VA2 breakers. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. 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.