What the ratings mean for fit
The Siemens 3VA1110-5EF32-0DC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated 100 A at 40 °C, with full thermal-magnetic line protection for distribution panels. The 187 kA breaking capacity at 240 V means it can safely interrupt very high fault currents without upstream fuses — sized for main or sub-feed positions where SCCR headroom is tight. Rated insulation voltage is 800 V, so it handles 480/600 V class systems without derating the insulation. The 70 mm depth and 76.2 mm width fit standard 3-pole MCCB panel cutouts; the unit accepts busbar or cable connections on the line and load sides. Current rating holds at 100 A through 50 °C, then tapers to 91 A at 70 °C — the thermal curve matters if the breaker sits in a warm enclosure near other heat sources. The undervoltage release (UVR) trips the breaker when control voltage drops, standard for emergency-stop or mains-monitoring circuits. Two HQ auxiliary switches provide status feedback to a PLC or indication lamp without an add-on module.
Deployment context
Mounts in a standard panel enclosure on a DIN rail or direct-mount plate — the 3-pole 76.2 mm width matches the common 3-module MCCB footprint. The line protection design (no ground-fault module, no communication function) suits main breaker or feeder duty where selectivity with downstream MCBs is set by the trip curve. The UVR coil draws from the control circuit; verify the release voltage matches your 24 V or 110 V control supply before wiring.