The Siemens 5SL6514-7 is a SENTRON miniature circuit breaker rated 0.3 A at 230 V AC, with a C tripping characteristic and a 6 kA breaking capacity per EN 60898 and IEC 60947-2. It's a 1P+N (switched neutral) unit in a 36 mm wide, 2-module-width housing — that's two standard DIN-rail slots. Current-production part, so no last-time-buy scramble.
What the ratings mean for your panel
The C-curve means the magnetic trip activates at 5 to 10 times rated current — standard for general-purpose lighting and small motor loads where inrush isn't extreme. At 0.3 A, this is a low-current branch; you'd see it on a control transformer secondary, a PLC power supply feed, or a signal-conditioner loop. The 6 kA breaking capacity is the same under both EN 60898 and IEC 60947-2, so it's rated for residential and light commercial panels where the prospective short-circuit current stays under that threshold. Derate the 0.3 A rating at elevated ambient: 0.28 A at 40 °C, 0.25 A at 55 °C — factor that into your wire sizing if the breaker lives in a warm enclosure. The 1P+N configuration switches both phase and neutral, with the neutral pole opening after the phase pole — important for isolation on single-phase circuits where you want guaranteed disconnection of both conductors. The neutral conductor switching feature is built in, so no separate neutral disconnect block needed. Mounting position is any, and the sealable design lets you lock the toggle position to prevent unauthorized reset — useful on a critical process loop. Touch protection is integral; IP20 with connected conductors means it's for dry indoor panels only, not washdown zones.
Compliance and documentation
Halogen-free and silicon-free construction — matters for clean-room or sensitive electronics environments where outgassing can cause contact corrosion. Overvoltage category III and pollution degree 2 are standard for fixed-installation distribution boards. The 10,000 typical mechanical operating cycles is the expected life under normal switching; this isn't a daily-switch-duty device, but it'll handle occasional manual operation for decades.