What it is and what it does
The Siemens 3VA1110-3EF32-0DC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — the primary feeder breaker in a distribution panel, not a motor-protective device. It carries a continuous current rating of 100 A at 40 °C, derating to 91 A at 70 °C, so the 100 A mark holds across most standard panel ambient conditions up to 50 °C before you need to consult the thermal curve. The 800 V rated insulation voltage (Ui) gives headroom for 480 V and 600 V class systems without de-rating the dielectric. Three poles, no ground-fault monitoring, no communication module — this is a straight thermal-magnetic breaker with an undervoltage release (UVR) and two HQ auxiliary switches built in. The UVR means the breaker trips when control voltage drops below a threshold, common for emergency-stop chains or undervoltage protection schemes. The auxiliary switches report the breaker state back to a PLC or status lamp without needing an add-on block.
Interrupting capacity — what the voltage columns mean
This MCCB's interrupting capacity is specified per voltage level, which is how the SCCR (short-circuit current rating) gets applied in a panel. At 240 V it clears 75.6 kA; at 415 V it clears 52.5 kA; at 440 V it clears 32 kA; at 500 V and 690 V it clears 11.9 kA. The drop-off above 440 V is typical for a compact-frame MCCB — the arc extinction limits the fault current it can safely interrupt at higher voltages. For a 480 V panel with a 65 kA available fault current, this breaker does not have the headroom; you would step to a higher interrupting-rated variant in the 3VA family.
Panel fit and integration
Footprint is 70 mm deep, 76.2 mm wide, 130 mm tall — a 3-pole MCCB that mounts on a DIN rail or direct panel-mount via the screw terminals. The 27.5 W maximum power loss matters for thermal management inside a sealed enclosure; if you are packing multiple breakers in a row, derate the enclosure's dissipation budget accordingly. The UVR coil draws from the control circuit, not the load side, so wire it to a separate 24 V or 120 V supply depending on the release rating ordered.