What this MCCB is and where it fits
The Siemens SENTRON 3VM1120-5EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a TM220 thermal-magnetic release — the first digit (2) indicates the thermal trip adjustment range, the second (20) the magnetic pickup multiplier. Rated 20 A continuously at 40 °C, it derates to 19 A at 60 °C and above, so in a warm enclosure you lose about 5 % headroom. The 70 mm depth and 76.2 mm width (3-inch standard) fit most DIN-rail or panel-mount footprints common in European switchgear.
Breaking capacity by voltage — the real coordination number
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 76 kA at 440 V, and 17 kA at 500 V. The steep drop above 440 V means the 500 V figure governs any 480 V or 500 V installation — 17 kA is still adequate for most low-fault industrial panels, but verify your available fault current at the point of installation. The 415 V rating (121 kA) covers the common European 400 V three-phase grid with substantial margin.
Panel integration and environment
Front protection is IP40 — suitable for general indoor panel use where no water jets or dust ingress are expected. Rated insulation voltage is 800 V, giving headroom for 690 V systems. Maximum power loss is 12 W, which matters for thermal management in a densely packed enclosure. Storage range is -40 to 80 °C; operating range is -25 to 70 °C.