The Siemens 5SY7210-7 is a 2-pole miniature circuit breaker from the SENTRON family, built to IEC/EN 60898-1 and IEC/EN 60947-2 with a UL 1077 listing. Rated 400 V AC and 60 V DC, with a breaking capacity of 15 kA per EN 60898 and 30 kA per IEC 60947-2. Under UL 1077 it carries 5 kA. The 2-pole design switches both live conductors but does not switch the neutral — it's a line-to-line or two-phase device, not a single-pole with switched neutral.
Environmental and installation fit
Rated for ambient temperatures from -40 °C to 75 °C with derating above 55 °C: max 95 % humidity at 55 °C, dropping to 35 % at 75 °C. That wide range covers unheated electrical rooms and outdoor enclosures in northern climates. IP20 with connected conductors — fine inside a sealed panel, not for washdown. The breaker is sealable for tamper-proofing in metering or critical circuits. Halogen-free and silicon-free matter for clean-room or sensitive electronics environments where outgassing can foul contacts or optics.