What the ratings mean for fit
The Siemens SENTRON 5SY8115-8 is a 1-pole miniature circuit breaker rated 1.6 A at AC with a D tripping characteristic. The D curve means it tolerates inrush currents 10–20 times the rated current before tripping magnetically — sized for motor and transformer branch circuits where the start-up surge would nuisance-trip a B or C curve. The 70 kA breaking capacity at AC per IEC 60947-2 tells you it can safely interrupt fault currents up to that level without upstream damage; that SCCR headroom makes it a fit for high-fault panels close to the transformer. At DC per IEC 60947-2 the rated breaking capacity is 15 kA, and under UL 1077 and CSA C22.2 No.235 it carries a 5 kA rating — so the part is recognized across IEC and North American supplementary protection standards.
Deployment context and panel integration
Snaps onto DIN rail via the quick assembly system, occupies 1 modular width unit (18 mm,), and can be mounted in any position. Installation depth is 70 mm; overall depth is 76 mm. The housing is IP20 with connected conductors — standard for enclosed distribution boards, not for wet washdown. Combined terminals at top and bottom accept both busbar and wire entry. Pollution degree 3 and overvoltage category III suit it for industrial control panels where conductive dust and transient overvoltages are expected. Rated for ambient temperatures from -40 to 75 °C with derating above 45 °C — the 1.6 A rating holds at 45 °C, drops to 1.56 A at 50 °C, and 1.52 A at 55 °C (–).
Approvals and compliance documentation
The breaker carries ratings per IEC 60947-2, UL 1077 and CSA C22.2 No.235 — so compliance documentation for RoHS, REACH, UL, and IEC is available from the manufacturer. The product is halogen-free and silicon-free, which matters for clean-room or sensitive electronic environments where outgassing can contaminate contacts or optics. Touch protection is built in. The product designation per IEC 81346-2 and DIN EN 61346-2 is F — a standard functional identifier for protective devices in panel schematics.