The Siemens 3VA1120-6EF32-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated 20 A continuous at 40 °C across a 3-pole frame, with a 220 kA interrupting capacity at 240 V AC — that's the headline number for fault clearing on a high-available-fault panel. It ships with an undervoltage release (UVR) built in, so it drops the load if the control voltage dips below the dropout threshold, which is the main reason someone searches this specific suffix.
The interrupting curve drops fast as voltage climbs: 154 kA at 415 V, 121 kA at 440 V, then a cliff to 17 kA at 500 V and 690 V. If your panel's available fault current sits above 17 kA at 480 V, this breaker still holds — but the 220 kA number only applies at 240 V. That's the spec that trips up a spec-in when someone reads the headline and misses the voltage column.
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a standard 3-pole MCCB footprint that drops into a SENTRON panelboard or standalone enclosure. The undervoltage release is wired to the control circuit; verify the dropout voltage against your 24 VDC or 120 VAC control supply before commissioning. No communication module on this variant, so it's a straight thermal-magnetic trip with line protection design.
Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems. Power loss at rated load is 14.5 W — negligible for panel thermal budgeting but worth noting if you're packing a dozen of these in a sealed enclosure. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.