What this MCCB delivers — and what the ratings mean for your panel
The Siemens SENTRON 3VA2110-6HN36-0BA0 is a 3-pole molded case circuit breaker rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That 100 A holds steady at every 5 °C step in between, so you don't have to oversize the frame for a warm enclosure. Breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. The 242 kA figure at 240 V means this breaker can safely interrupt a fault current up to that level without welding contacts or cascading upstream — critical for high-fault installations like transformer secondaries or large motor control centers. The steep drop to 3.7 kA at 690 V tells you this is a 240–500 V workhorse, not a 690 V main breaker. Rated insulation voltage is 800 V, so the internal clearances and creepage are designed for 690 V systems with margin. Maximum power loss is 12.5 W — modest for a 100 A frame, which keeps enclosure heat rise manageable in a packed panel.
Built-in undervoltage release — line protection design
This MCCB includes an undervoltage release (UVR) as a factory-fitted auxiliary release. That means the breaker trips automatically when supply voltage drops below a set threshold — standard for machinery safety circuits where you want the breaker to drop out on a brownout or control-power loss rather than reclose automatically. The design is explicitly for line protection, not motor or feeder protection, so it's the right pick for a main incoming breaker or a distribution branch where you need coordinated undervoltage response.
Physical fit — panel and enclosure planning
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That's a 4.13 x 7.13 x 3.39 inch footprint — standard for a 3-pole 100 A SENTRON 3VA frame. It mounts on a DIN rail or directly to a backplate via the breaker's own mounting points. The 86 mm depth means it clears a 120 mm deep enclosure with room for wiring gutters; plan for at least 100 mm clearance in front for the handle throw and arc-chamber venting.