It combines a 20 A thermal-magnetic MCB (C-curve) with a 30 mA earth-leakage module in a single DIN-rail unit. The 30 mA sensitivity catches ground faults that could shock a person, so it's common in final subcircuits where personnel protection is needed. Breaking capacity is 6 kA Icn at 380–415 V AC per EN/IEC 61009-2-1, with a 6 kA Icu per EN/IEC 60947-2.
The 4-pole body takes 8 x 9 mm pitches (72 mm wide), 85 mm tall, 76 mm deep — fits most enclosure cutouts with room for wiring. Tunnel terminals top and bottom accept 1–35 mm² rigid or 1–25 mm² flexible; strip 12 mm and torque to 2 N.m.