Rated 40 A continuous at 40 °C ambient, it holds that full rating through 50 °C — at 55 °C it derates to 38.4 A, and at 70 °C it's at 36 A, per the datasheet. That thermal curve means a panel running at elevated internal temperatures still delivers close to the nominal current, which matters when the breaker is enclosed alongside other heat sources. Breaking capacity is 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500 V and 690 V. Three-pole construction with an undervoltage release (UVR) fitted.
Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth (2.76 inches). Maximum power loss is 13.3 W at rated load. In a sealed, uncooled enclosure, that heat adds to the internal temperature rise — factor it into the thermal derating calculation if the breaker sits alongside other high-wattage devices.