The Siemens 5SU1344-7RC40 is a 4-pole RCBO rated at 40 A with C-curve tripping and Type A 30 mA residual current protection, packaged in a 7-module width for DIN-rail mounting in final distribution boards.
What the ratings mean for fit
The 40 A thermal-magnetic C-curve handles moderate inrush from motor or lighting loads without nuisance tripping, while the 30 mA Type A residual element catches pulsating DC fault currents common on electronics-fed circuits — a standard spec for mixed-load final subcircuits in commercial and light industrial panels. At 7 modules wide, it consolidates four poles of overcurrent and earth-leakage protection in one unit.