What it is and what it does
The Siemens 5SL6114-7 is a 1-pole miniature circuit breaker from the SENTRON series, rated 0.3 A with a C-curve tripping characteristic. Its 6 kA breaking capacity is certified to both EN 60898 and IEC 60947-2, so it covers residential and light commercial panelboards as well as industrial control circuits where the fault level stays under that limit. The C-curve means the magnetic trip activates at 5 to 10 times rated current — right for moderate inrush loads like small motors, transformers, or lighting ballasts. At 0.3 A it's a low-current branch, often used for control transformers, contactor coils, or PLC power supplies inside the panel.
Panel fit and derating
Width is 18 mm — one modular unit on a DIN rail. Depth 76 mm, installation depth 70 mm, so it sits flush in a standard distribution board without protruding past the gland plate. Mounting position is any; no derating needed for horizontal or vertical orientation. Thermal derating is published: 0.3 A at 30 °C, 0.28 A at 40 °C, 0.27 A at 45 °C, 0.25 A at 55 °C. In a crowded enclosure where ambient hits 40 °C, figure 0.28 A as the continuous rating — the breaker won't nuisance-trip on a 0.3 A load at that temperature. Supplementary devices (auxiliary switches, shunt trips, alarm contacts) can be snapped onto the right side — the product extension flag is yes. That lets you add remote status or trip indication without replacing the breaker.