This is the Schneider A9Z21463, a 4-pole 63 A residual current circuit breaker from the Acti9 iID line. 30 mA Type A sensitivity catches both sinusoidal and pulsating DC faults. Voltage independent tripping—no external supply needed—and instantaneous, so it clears a ground leak fast. Mounts on DIN rail, four modules wide at 72 mm.
Clip-on DIN rail mount. Double terminals up front accept 1-35 mm² rigid or 1-25 mm² flexible. Wire strip to 14 mm, torque to 3.5 N.m. Padlocking device for lockout. IP20 body, IP40 in modular enclosure. Pollution degree 3 rated.