The Siemens SENTRON 3VA1120-6EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A continuous current across a 40 °C to 55 °C ambient range, derating to 19 A at 60 °C and above. It uses a TM220 thermal-magnetic overcurrent release — the fixed thermal element handles overloads, the magnetic trip handles short-circuits — and is designed for line protection in distribution panels.
Mounts on a DIN rail or panel-mount base. Dimensions: 130 mm height, 76.2 mm width, 70 mm depth — fits standard 3-pole MCCB cutouts. Front face carries IP40 protection; the enclosure is not rated for washdown environments.
The breaking capacity is the headline number for this class: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. That 220 kA figure at 240 V means it can safely interrupt a fault current up to that level without venting or cascading to upstream breakers — critical for high-fault installations like transformer secondaries or large motor control centers. The 800 V rated insulation voltage (Ui) confirms it's suitable for 480 V and 600 V class systems with margin.
Power loss at rated current is 12 W maximum. Operating temperature range is -25 °C to +70 °C; storage from -40 °C to +80 °C. No undervoltage release, no ground-fault monitoring, no communication function on this variant — it's a straight thermal-magnetic breaker for line protection.