The Siemens 5SY6301-7CC is a SENTRON miniature circuit breaker (MCB) rated 1 A with a C tripping characteristic, 3-pole design, and a 6 kA breaking capacity per EN 60898.
The 1 A rating at 35 °C drops to 0.94 A at 40 °C, 0.91 A at 45 °C, 0.88 A at 50 °C, and 0.84 A at 55 °C — so if your panel ambient runs above 35 °C, you must derate the breaker or step up to the next amp size.
Dimensions: 76 mm deep, 54 mm wide (3 MW), 90 mm tall. Installation depth is 70 mm. The quick-assembly fastening method snaps onto standard DIN rail. Sealable — useful for metering or isolation applications where tamper evidence is required. Halogen-free and silicon-free construction avoids corrosive outgassing in sealed enclosures.