The Siemens SENTRON 3VA2110-5JP32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 100 A continuously at 40 °C and interrupting up to 187 kA at 240 V. That interrupting capacity at 240 V is the headline number — it tells you this breaker can clear a fault on a high-capacity transformer secondary without the arc re-striking. The ETU550 electronic trip unit gives you adjustable long-time, short-time, and instantaneous protection curves, plus ground-fault alarm capability (the unit itself has no ground-fault monitoring, but the trip unit supports it via an external module).
Ratings and what they mean on the panel
The 100 A rating holds flat from 40 °C up to 50 °C — no derating needed in a typical 40 °C panel. At 55 °C it drops to 96.25 A, at 60 °C to 92.5 A, and at 70 °C to 85 A. If your panel ambient runs hot, you size the breaker for the derated value, not the nameplate 100 A. The interrupting curve falls off with voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. That 690 V figure is low enough that you verify available fault current at that voltage before committing the BOM line. Rated insulation voltage is 800 V, so the breaker is rated for 690 V systems with margin. The shunt trip (STL) is built in — part number 3VA9688-0BL33 for the integrated auxiliary trip. Two auxiliary switches (HQ type) are included, giving you status feedback for the PLC or a remote annunciator. No undervoltage release, no phase-failure detection, no ground-fault monitoring on this variant. Communication function is present — the ETU550 supports it via a plug-in module.
Panel fit
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is a standard 4-module (4 x 27 mm) footprint for SENTRON 3VA2 breakers — it clips onto the mounting plate or DIN rail adapter. The 86 mm depth includes the handle and terminals; leave clearance for cable bending radius below the line and load lugs.