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The Siemens 5SJ4108-7HG42 is a single-pole miniature circuit breaker designed for reliable circuit protection in industrial and mechanical engineering applications. It offers an 8A operational current at 30°C and a switching capacity of 10kA according to EN 60898, with a higher rating of 15kA per IEC 60947-2.
This circuit breaker operates with a C tripping characteristic, providing protection against overcurrents and short circuits. It supports a wide range of operating voltages, including up to 277V AC according to UL 489 and CSA C22.2 No. 5-02, and up to 125V DC in a 2-channel configuration. The device is built with a mechanical service life of 10,000 switching cycles and features touch protection.
With a compact design measuring 18mm in width and 70mm in depth, it mounts easily on a standard DIN rail. The circuit breaker is halogen-free, sealable, and silicon-free, contributing to environmental considerations in its application. It is suitable for environment B regarding EMC.
Connections are made via combined terminals at the top and bottom, accommodating conductor cross-sections from 0.75 mm² to 25 mm² with a maximum tightening torque of 3.5 N·m. The power loss per pole at rated current and in a hot operating state is 2.6W.
The tripping characteristic is C.
The rated operational current is 8A at 30°C and 40°C.
The breaking capacity is 10kA according to EN 60898 and 15kA according to IEC 60947-2.
The operating voltage for UL 489 and CSA C22.2 is 277V AC.
It is a 1-pole circuit breaker.
It mounts on a standard DIN rail.
The mechanical service life is 10,000 switching cycles.