It carries a TM220 thermal-magnetic overcurrent release, so the thermal element handles overloads and the magnetic element handles short circuits, no electronics to program or fail.
This breaker's interrupting capacity drops as system voltage rises: 187 kA at 240 V, 121 kA at 415 V, 76 kA at 440 V, and 17 kA at 500 V. That's well above typical 50-65 kA panelboard ratings, so it works as a main breaker feeding downstream branch protection without coordination concerns at the service entrance.
Thermal derating — don't ignore the ambient curve
At 55 °C it's 78 A, at 60 °C it's 77 A, at 65 °C it's 75 A, and at 70 °C it's 74 A. That's a 7.5% drop from 40 °C to 70 °C — tighter than many MCCBs, which can lose 15-20%. The 3VM series uses a compensated bimetal; you don't need to oversize the frame for a warm enclosure.
Panel fit and environment
Mounts on a DIN rail or panel-mount plate — the 101.6 mm width (4 inches) and 130 mm height fit standard SENTRON 3VM cutouts.