Siemens 3VM1220-3ED32-0AA0 — SENTRON MCCB, 200 A, 76 kA
The Siemens 3VM1220-3ED32-0AA0 is a SENTRON molded case circuit breaker (MCCB) with a TM210 thermal-magnetic overcurrent release, line protection version, and three poles. It carries 200 A continuously at 40 °C ambient and holds that rating flat through 50 °C, then derates to 176 A at 70 °C — a thermal curve that matters when the breaker lives in a crowded, hot panel. The interrupting capacity hits 76 kA at 240 V AC and 53 kA at 415 V AC, so it handles high-fault utility feeds without cascading upstream.
Breaking capacity and selectivity
At 415 V the 53 kA rating is the figure that governs most European industrial distribution panels. At 440 V it drops to 32 kA, and at 500 V to 12 kA — still enough for secondary distribution in a 480 V plant. The LI protection function (long-time and instantaneous) with an adjustable li max of 2000 A lets the site engineer coordinate downstream branch breakers without nuisance trips on motor inrush.
Physical fit and panel integration
Dimensions are 105 mm wide, 158 mm high, 70 mm deep. The 3-pole footprint matches the standard SENTRON 3VM family cutout. Front IP40 protection means it is suited for enclosed panel mounting where tools or fingers cannot contact live parts. Rated insulation voltage Ui is 690 V AC; max DC operational voltage is 500 V. Power loss at full load is 42 W — account for that in the enclosure thermal budget.