The Siemens SENTRON 5SY7314-7 is a 3-pole miniature circuit breaker with a C tripping characteristic, rated at 0.3 A at AC. It carries a 15 kA breaking capacity per EN 60898 and a 50 kA rating per IEC 60947-2, making it suitable for industrial branch-circuit protection where high fault currents are possible.
Ratings and what they mean for fit
The 0.3 A rated current is the continuous current the breaker can carry at 35 °C ambient without tripping. At elevated panel temperatures — 40 °C, 45 °C, 50 °C, 55 °C, 60 °C — the rating derates to 0.29 A, 0.28 A, 0.27 A, 0.26 A, and 0.25 A respectively. If your panel runs hot, size the load below the derated value, not the 35 °C figure. The C-curve trips at 5 to 10 times rated current, so it handles moderate inrush from small transformers or lighting ballasts without nuisance tripping. The 15 kA breaking capacity per EN 60898 covers most residential and light commercial installations; the 50 kA per IEC 60947-2 is what you rely on in an industrial panel where the prospective short-circuit current is higher. Pollution degree 3 and overvoltage category III mean the breaker is rated for the typical industrial environment — conductive pollution or dry non-conductive pollution that becomes conductive due to condensation is expected, and it can handle transient overvoltages from the mains supply. The IP20 rating (with connected conductors) is standard for enclosed panel mounting; it is not intended for washdown or outdoor exposure.
Panel integration and compliance
The breaker occupies 3 modular width units (54 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. It mounts in any position and uses a quick assembly system. The combined terminal top and bottom accept conductors for straightforward daisy-chaining. Touch protection is built in. It is halogen-free and silicon-free, which matters for panels in clean-room or sensitive electronic environments where outgassing can cause contact corrosion. Compliance documentation covers IEC/EN 60898-1, IEC/EN 60947-2, and UL1077 — the UL listing is the one to verify if your panel ships to a North American site that requires UL 508A.