What this MCCB is and what it protects
The Siemens 3VA1110-4EF32-0BA0 is a 3-pole SENTRON molded case circuit breaker designed for line protection, carrying a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). Rated 100 A continuously at 40 °C ambient — and it holds that same 100 A rating up through 50 °C, only starting to derate at 55 °C (98 A) and dropping to 91 A at 70 °C. That thermal stability means you don't lose headroom in a warm enclosure as long as you stay below 50 °C. Breaking capacity is where this breaker earns its keep: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and still 11.9 kA at 690 V. That's a high-interrupting rating for a 100 A frame — it handles fault currents that would weld a standard MCCB's contacts shut, so it's suited for transformer-secondaries or high-capacity bus risers where the available fault current is substantial. Insulation voltage is rated 800 V, and the maximum power loss hits 27.5 W — worth factoring into your enclosure thermal budget if you're packing several of these in a row.
Integration notes — panel fit and auxiliaries
Dimensions are 130 mm height, 76.2 mm width (3 in), and 70 mm depth — a standard SENTRON 3VA1 frame footprint that fits existing 3VA panel cutouts and busbar arrangements. The built-in undervoltage release (UVR) trips the breaker when control voltage drops below the dropout threshold — common for emergency-stop circuits or undervoltage protection on motor feeders. No separate UVR module to mount; it's integral to the breaker. No trip indicator and no communication function on this variant — it is a line-protection breaker with thermal-magnetic trip. Operating temperature range is -25 °C to 70 °C; storage range -40 °C to 80 °C. The storage spec is wider — that's the limit for handling and warehousing, not running.