Rated current holds at 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C through 70 °C — no derating needed in most ventilated enclosures, but worth checking if the breaker sits in a hot compartment near other heat sources. Breaking capacity of 187 kA at 240 V AC covers high-capacity transformer secondaries and large motor control centers; the 121 kA at 415 V AC still handles most 400 V industrial feeds. Insulation voltage rated 500 V, operating voltage up to 415 V AC or 250 V DC. Power loss max 8 W — modest for a 20 A MCCB, helps with enclosure thermal budgeting.
Dimensions: 70 mm deep, 50.8 mm wide (2 inches), 130 mm high. The 2-pole width is standard for a 2-pole MCCB — fits a 2-module space in most distribution boards.