The Siemens 5SM9336-6 is a SENTRON residual current (RC) unit designed to pair with a 5SL4 miniature circuit breaker, forming a combined RCD/MCB assembly for 3-pole circuits. It is a Type A device, meaning it detects both sinusoidal AC residual currents and pulsating DC residual currents up to 30 mA — the standard threshold for personal protection against indirect contact in IEC 60364 installations. The 63 A rated current and 400 V AC supply voltage suit it for main incomers or sub-distribution in commercial and industrial panels where a single device provides both overcurrent and earth-fault protection.
Rated at 63 A AC and 30 mA residual current, the 5SM9336-6 covers the common 63 A cutout found in distribution boards feeding sub-mains or high-load final circuits. The 3 kA surge current resistance tells you the device can withstand transient overcurrents without nuisance tripping — important for capacitive or motor-starting loads on the same bus. With 10 000 mechanical switching cycles typical, it is built for the normal service life of a distribution board, not for frequent manual switching duty. The Type A classification means this unit handles the mixed-frequency fault currents common in modern circuits with single-phase rectifiers, switched-mode power supplies, or variable-speed drives — a step above Type AC, which only detects sinusoidal AC faults. For circuits feeding electronics, lighting ballasts, or small drives, Type A is the minimum required by IEC 60364-5-53 in many jurisdictions. Terminals accept solid conductors from 0.75 to 35 mm² and stranded from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m. That range covers standard panel wiring from 1.5 mm² control circuits up to 10 mm² or 16 mm² sub-main tails — no need for pin lugs or reducers at the larger end.
Standard rail mounting on a DIN EN 60715 top-hat rail, occupying 3 width units — 54 mm wide. Installation depth is 70 mm, matching the 5SL4 breaker it clips to. Mounting position is any, so the assembly can be oriented vertically or horizontally in the panel without derating. The supply cord connects at the top, above the miniature circuit breaker.