What the ratings mean for fit
The Siemens SENTRON 3VA2110-5HN32-0KA0 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 — meaning no derating is needed in a warm enclosure. Its insulation voltage is rated 800 V, so it handles 480/600 V class systems with headroom. The breaking capacity at 240 V is 187 kA, at 415/440 V it's 121 kA, and at 500 V it's 75.6 kA; at 690 V it drops to 3.7 kA. For a 480 V distribution panel, the 75.6 kA SCCR at 500 V gives you a solid margin above typical 65 kA or 100 kA requirements. The unit is designed for line protection and includes a shunt trip (STL) auxiliary release for remote tripping.
Physical integration
The 3VA2110-5HN32-0KA0 measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most SENTRON panelboards and switchgear cubicles without re-drilling. Maximum power loss is 10 W, so ventilation in a sealed enclosure is manageable.