What this RCBO is and what it protects
The Siemens 5SV9316-6PK40 is a SENTRON RCD-operated circuit breaker (RCBO) combining overcurrent protection and residual current detection in a single 2-pole, 1P+N module. It is rated 40 A at 30 °C with a 30 mA residual trip threshold, Type A (pulsating DC and AC sensitive), and a 6 kA breaking capacity per EN 60898 and IEC 60947-2. The tripping characteristic is B (3-5 In instantaneous magnetic release), so it is sized for resistive and light inductive loads where inrush is modest — think general socket circuits, lighting, and small control transformers in a distribution board.
Fit and panel integration
The 5SV9316-6PK40 occupies one modular width unit (18 mm) on a DIN rail, with a depth of 77 mm and an installation depth of 70 mm. Mounting position is any, and the supply cord enters from below. The IP20 rating applies when installed in a distribution board with conductors connected — standard for enclosed panel use. The silicon-free construction matters for potting or conformal-coating processes in sensitive electronics environments.
Thermal derating and environmental limits
The 40 A rating holds at 30 °C ambient. Derate to 38 A at 40 °C, 36.8 A at 45 °C, 36 A at 50 °C, and 34.8 A at 55 °C. Operating ambient range is -40 to 75 °C, with max 95% humidity. Overvoltage category III and pollution degree 2 — suitable for fixed installation downstream of the main distribution board.