The Siemens 5SV1616-1KK06 is a SENTRON RCBO — a combined residual current circuit breaker and overcurrent protection device in one 18 mm wide module. It's rated 6 A at 30 °C with a 300 mA AC-type residual trip, C tripping characteristic, and a 6 kA breaking capacity per EN 60898. The 1P+N design (two poles, one protected) protects the live conductor and switches the neutral, fitting standard single-phase final circuits in distribution boards.
Temperature derating matters in a sealed enclosure
This RCBO is rated 6 A at 30 °C, but if your distribution board runs warm — and many do, especially with multiple devices packed in — the continuous current drops. At 40 °C it's 5.64 A; at 50 °C it's 5.28 A; at 60 °C it's 4.86 A; at 70 °C it's 4.44 A.
