The Siemens 5SM9322-0KN is a SENTRON RC unit electronic, 2-pole, type AC, rated at 40 A with a 30 mA residual operating current, designed for 230 V AC at 50 Hz. The instantaneous design means it trips without intentional delay on a fault — no time-grading curve to account for in coordination studies.
The 2-pole form factor fits standard DIN-rail enclosures for residential or light commercial distribution boards. The 30 mA sensitivity covers personnel protection per IEC 60364 (additional protection against direct contact). Type AC detection handles sinusoidal AC residual currents only — not suitable for pulsed DC or mixed-frequency waveforms found on VFD-fed circuits.