What this MCCB carries and why it matters
The Siemens SENTRON 3VM1220-5EE32-0AA0 is a 3-pole molded case circuit breaker rated for 200 A continuous at 40 °C, with a TM220 thermal-magnetic overcurrent release. Its interrupting capacity hits 187 kA at 240 V AC and 121 kA at 415 V AC — numbers that tell you this breaker is built for high-fault panels where a standard MCCB would weld shut. The 800 V rated insulation voltage and 690 V AC operating voltage line it up for 480 V and 600 V class distribution without a derate headache.
Thermal curve and real-world current
The 200 A rating holds steady up to 50 °C ambient (–). Above that it steps down: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C (–). That matters if this breaker sits near transformers or drives inside a hot enclosure — you don't lose half your capacity, but you do lose 12 % at the top of the range. The maximum power loss of 42 W is manageable for a 200 A frame, but it's heat that needs to leave the panel.
Panel fit and environment
The 3VM1220-5EE32-0AA0 measures 105 mm wide, 158 mm tall, and 70 mm deep. That 105 mm width is a standard three-pole frame — it fits the usual DIN-rail or panel-mount footprint for 200 A MCCBs. The front face carries an IP40 rating, meaning tools and fingers are kept out, but it's not sealed against hose-down; keep it in a dry enclosure. Operating temperature spans -25 °C to 70 °C, so it can sit in an unheated electrical room or a hot machinery bay.
What the TM220 release means
The TM220 designation tells you this is a thermal-magnetic release with a fixed thermal pickup and a magnetic trip that responds to short-circuit current. It's line-protection design, not motor-protection — no adjustable overload curve for starting inrush. Use it for feeder circuits, distribution panels, and cable protection where the load is resistive or the motor has its own overload relay downstream.