The 20 A rating holds steady from 40 °C through 55 °C, then derates slightly to 19 A at 60 °C and above — useful to know if this breaker lands in a warm cabinet or near other heat sources. Breaking capacity is the headline here: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a compact footprint for a 3-pole MCCB with this breaking capacity. The 76.2 mm width (3 inches) matches the standard SENTRON 3VA1 form factor, so it slots into a panel alongside other 3VA breakers without odd spacing. Maximum power loss is 14.5 W. In a dense panel, that heat adds up — factor it into your thermal budget, especially if the breaker is enclosed or adjacent to temperature-sensitive electronics.