The Siemens SENTRON 5SY6608-7 is a 4-pole miniature circuit breaker (3P+N) with a C tripping characteristic, rated 8 A at AC 50/60 Hz.
What the ratings mean in the panel
At 8 A that means the magnetic trip holds through a 40–80 A surge, so it won't nuisance-trip on a motor start. Temperature derating is baked in: at 40 °C the continuous rating drops to 7.51 A, at 50 °C to 6.99 A. Mount in any position, install depth 70 mm.
Compliance and environment
Sealable to prevent tampering. Halogen-free and silicon-free construction. Touch-protected terminals.
