The Siemens 5SU1356-0DA20 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS-protector — in a single module. It provides both earth-leakage and overcurrent protection for a 1+N-pole final circuit, rated at 20 A with a B-curve trip characteristic and 30 mA residual-current sensitivity (Type AC). The 6 kA breaking capacity covers most domestic and light commercial distribution boards. The pig-tail neutral connection simplifies wiring in panel builds where the neutral bar is already landed.
Deployment context
Rated for DIN-rail mounting in a standard distribution board or sub-distribution panel. The 70 mm depth (D=70MM) fits enclosures with typical gland-plate clearance. Type AC detection means it responds to sinusoidal AC residual currents — the common choice for general socket-outlet and lighting circuits where non-sinusoidal waveforms are not expected.