The Siemens 5SY8115-7 is a 1-pole SENTRON miniature circuit breaker with a C tripping characteristic, rated 1.6 A at 440 V AC (single- or multi-phase) and 72 V DC. On the DC side, it's rated 15 kA per the same standard, so it handles DC control circuits up to 72 V.
Rated current holds at 1.6 A up to 45 °C. At 50 °C it derates to 1.56 A, at 55 °C to 1.52 A. The breaker operates from -40 °C to 75 °C ambient, with humidity limits of 95% up to 55 °C, 55% up to 70 °C, and 35% up to 75 °C.
Depth is 76 mm (70 mm installation depth), height 90 mm, width 18 mm (1 modular unit). Sealable, halogen-free, silicon-free — relevant for environments sensitive to outgassing or where tamper evidence is required.