The Siemens SENTRON 5SU1353-1WM16 is a 1P+N RCBO combining overcurrent and residual current protection in a two-module-width package. Rated 16 A with a C tripping curve, it clears 30 mA AC fault currents (Type AC) per EN 60898 at 4.5 kA and per IEC 60947-2 at 15 kA — the higher IEC figure matters when the device sits in an industrial panel with higher prospective fault current, while the EN rating governs residential and commercial distribution boards. The 30 mA trip threshold is the standard for personal protection against indirect contact in TN and TT systems.
Panel fit and wiring
Mounts on 35 mm DIN rail in any position. Two width units (36 mm) and a 70 mm installation depth mean it occupies the same footprint as a standard single-pole MCB plus a neutral switching module — no extra space needed for the RCD function. Terminals accept 0.75 mm² to 25 mm² solid or stranded copper, which covers the full range of circuit conductors for a 16 A final subcircuit. Supply can enter from top or bottom, simplifying busbar routing in a crowded enclosure.
What the ratings mean for the buyer
The C characteristic means the magnetic trip operates at 5 to 10 times rated current — suited for circuits with moderate inrush, like lighting banks or small motor loads, where a B curve would nuisance-trip and a D curve would delay protection too long. The 30 mA residual sensitivity covers the majority of socket-outlet and general-purpose circuits requiring RCD protection under IEC 60364. The 4.5 kA EN 60898 rating is the standard domestic/commercial breaking capacity; the 15 kA IEC 60947-2 rating confirms the device can also clear higher fault currents found in industrial sub-distribution boards. The neutral pole is switched, so the RCBO isolates both phase and neutral when tripped — mandatory in TN-S systems where the neutral is not solidly earthed at the board.