The Siemens 5SU9326-7CR40 is a 1P+N residual current circuit breaker with integral overcurrent protection (RCBO) rated at 40 A with a C-trip characteristic, 30 mA Type A residual sensitivity, and a 6 kA breaking capacity at 230 V AC. The Type A detection handles pulsating DC fault currents from rectified loads — common on modern panels feeding VFDs, switched-mode supplies, or single-phase drives.
The 1P+N form factor occupies a single module width, leaving adjacent slots free for additional RCBOs or MCBs.