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The Siemens 5SJ4102-8HG40 is a 1-pole miniature circuit breaker (MCB) from the 5SJ4 series, designed for industrial and mechanical engineering applications. It operates with a rated supply voltage of 400V AC and offers a breaking capacity of 10 kA according to EN 60898 and 15 kA according to IEC 60947-2. The breaker features a D-curve tripping characteristic, suitable for applications with high inrush currents.
This MCB has an operational current rating of 2A at 30°C and 40°C, with a slight derating at higher temperatures. It supports a wide range of conductor cross-sections from 0.75 mm² to 25 mm² for finely stranded conductors with core end processing, and requires a tightening torque of 3.5 N·m.
Designed for easy installation, the 5SJ4102-8HG40 mounts on a standard DIN rail and has a compact width of 18 mm, corresponding to one modular width unit. It offers IP20 protection with connected conductors and IP40 in the handle range. The breaker is halogen-free, sealable, and silicon-free, contributing to environmental safety. It also supports the installation of supplementary devices for expanded functionality.
The rated supply voltage is 400V AC. The maximum operating voltage is 120V AC per UL 489 and 60V DC.
The device has dimensions 90mm height, 18mm width, and 70mm depth. It mounts on a standard DIN rail and weighs 163g.
It has a D tripping characteristic, designed for high inrush currents.
The switching capacity is 10kA according to EN 60898 and 15kA according to IEC 60947-2.
It is approved by CCC, CE, EAC, and UL489.
The typical mechanical service life is 10,000 switching cycles.
The protection class is IP20 with connected conductors and IP40 in the handle range.