It's designed for line protection in distribution panels, and the 63 A rating holds from 40 °C up to 50 °C ambient before derating begins — at 55 °C it's still 62 A, 60 °C drops to 61 A, and at 70 °C it's 58 A.
Breaking capacity by voltage level
This MCCB delivers 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. The steep drop above 440 V is typical for a frame this size — at 690 V the 17 kA still covers most industrial motor branch circuits, but if your fault current at that voltage exceeds 17 kA you need a higher-rated frame. At 240 V the 220 kA rating is exceptionally high, suitable for large transformer secondaries or high-capacity busway feeds.
The 4-pole width (101.6 mm) is standard for a 63 A frame — verify the mounting footprint matches your existing DIN-rail or panel-mount cutout.
What the TM220 release means for coordination
The TM220 designation indicates a thermal-magnetic release with a fixed thermal pickup and adjustable magnetic trip. For selective coordination studies, the fixed thermal curve and magnetic threshold are documented in the Siemens 3VA manual.