Siemens SENTRON 5SU1336-6FP16 RCBO — 3-Pole, 16 A, Type B, 6 kA
The Siemens SENTRON 5SU1336-6FP16 is a 3-pole RCBO (residual current circuit breaker with overcurrent protection) rated 16 A at 30 °C with a Type B tripping characteristic. It breaks fault currents up to 6 kA per EN 60898 and IEC 60947-2, making it suitable for final circuits in residential and commercial distribution boards where both overcurrent and earth leakage protection are required in a single device. The 400 V AC, 50 Hz rating and overvoltage category III cover standard mains supply conditions. Rated current derates with ambient temperature: 15.2 A at 40 °C, 14.8 A at 45 °C, 14.3 A at 50 °C, 13.9 A at 55 °C, 13.4 A at 60 °C, and 12.5 A at 70 °C. This derating curve matters when the RCBO is installed in a crowded enclosure where internal temperature rise is expected — the 16 A label applies only at 30 °C ambient. The Type B characteristic trips instantaneously at 3 to 5 times rated current, which is the standard curve for general-purpose socket outlets and lighting circuits where no high inrush currents are expected. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation) matches typical distribution board environments.
Mounting and integration
Occupies 3 modular width units (54 mm) on a DIN rail. Installation depth is 70 mm; overall depth including terminals is 72 mm. Height is 85 mm. Mounting position is unrestricted — any orientation is permitted. Supply can enter from either the top or bottom, simplifying busbar and cable routing in the panel. IP20 protection applies when installed in a distribution board with conductors connected — the front face is touch-safe but the device is not sealed against moisture ingress. Rated for 95% humidity (non-condensing).
Electrical ratings and compliance
Insulation voltage (Ui) is 500 V. Surge voltage resistance is 4 kV. Surge current withstand is 0.25 kA at 8/20 µs waveform. Energy limitation class 3 indicates the device limits let-through energy to a low level during fault clearing, which aids downstream coordination. Breaking capacity is 6 kA per both EN 60898 and IEC 60947-2. The RCBO is designed for instantaneous operation — no intentional time delay. Tested at a minimum of 340 V for routine testing.