At 55 °C it holds 24 A, at 65 °C it holds 23 A, and at 70 °C it holds 23 A — so in a warm panel you lose about 1 A per 5 °C above 50 °C. The TM240 thermal-magnetic release means the thermal element is fixed-trip at 25 A; the magnetic instantaneous pickup is factory-set and not field-adjustable.
Interrupting capacity by voltage level
This breaker's interrupting capacity varies sharply with system voltage: 121 kA at 240 VAC, 75.6 kA at 415 VAC, 52.5 kA at 440 VAC, and 11.9 kA at both 500 VAC and 690 VAC. For a 480 V panel (common in North America) the 52.5 kA rating at 440 V is the closest published benchmark; the actual 480 V value is not listed here, so verify against the full device manual if your available fault current approaches that range.
The 3VA1125-4EF42-0AA0 measures 70 mm deep, 101.6 mm wide, and 130 mm high. The 101.6 mm width (4 inches) is the standard MCCB footprint for a 4-pole frame in this SENTRON series.
Power loss and operating range
Maximum power dissipation is 8.5 W at rated load.