What it is and what it does
The Siemens SENTRON 3VA2110-5HN36-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed in a warm panel. It's designed for line protection, meaning it sits at the feeder or main distribution point, not on a motor circuit. The interrupting ratings are substantial: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V tells you this breaker can handle high-fault scenarios like transformer secondaries or large busway feeds without cascading upstream.
Integration into the panel
The 3VA2110-5HN36-0JH0 measures 105 mm wide by 181 mm tall by 86 mm deep — a standard 4.13 in × 7.13 in × 3.39 in footprint that fits common MCCB panel cutouts. It ships with a shunt trip (STL) auxiliary release and a configurable auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch HQ. That alarm switch gives a positive signal when the breaker trips on fault, which is useful for remote annunciation or PLC input. The undervoltage release is not fitted, so if you need UVR protection you'll order a different variant or add it separately.
What the ratings mean for selection
The 100 A rating is flat from 40 °C to 70 °C — that's unusual for an MCCB and means you don't have to oversize for a hot enclosure. The maximum power loss is 10 W, which is modest for a 100 A frame. The 187 kA interrupting capacity at 240 V is the headline number; at 415 V it's still 121 kA, so this breaker handles high-fault commercial and industrial services. The 3.7 kA at 690 V is lower but still adequate for most 690 V distribution where fault currents are typically below that level.