The ABB 2CDS272001R0064 is a C-curve miniature circuit breaker rated 6 A, 2-pole, with a rated insulation voltage of 440 V. The 10 kA Icn (rated short-circuit breaking capacity per IEC 60898) tells you it can safely clear a fault up to that level on the downstream side; the 25 kA Icu (per IEC 60947-2) is the ultimate capacity it can handle once before needing replacement — that extra headroom matters for selectivity coordination in a panel where upstream devices need to see the fault first.
Snaps onto a standard DIN rail — 35 mm wide, 88 mm tall, 69 mm deep. The IP20 rating on the front means finger-safe from the face; IP40 on the enclosure body keeps out tools and wires over 1 mm. Overvoltage category III suits fixed-installation distribution panels where transients from the utility side are expected. Terminal torque spec of 2.8 Nm for the screw-type bi-directional cylinder lift terminals — standard for 2.5 mm² to 6 mm² conductors in a panel-building workflow.