Thermal derating and real-world fit
This breaker holds its full 80 A rating up to 50 °C ambient — at 55 °C it derates to 78 A, at 60 °C to 77 A, and at 70 °C to 74 A. That means in a warm panel (say, 55 °C inside the enclosure) you lose only 2 A of headroom; the TM210 release still provides reliable overload protection. The 70 mm depth and 50.8 mm width (2.8 in × 2 in) fit the standard SENTRON 3VA mounting footprint, so it drops into existing 3VA panel layouts without re-drilling.
Rated insulation voltage Ui is 500 V, and max rated operational voltage with DC is 250 V — so it's suitable for 480 V AC distribution and 250 V DC circuits. The adjustable short-circuit release Ii is fixed at 800 A (both min and max), meaning the magnetic trip threshold is non-adjustable on this TM210 variant. Latching endurance is 20 000 operations — adequate for a distribution breaker that sees infrequent switching.