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This Siemens 5SJ4340-7HG42 is a 3-pole miniature circuit breaker designed for industrial and mechanical engineering applications. It features a 40A operational current rating at 30°C and a C-curve tripping characteristic, suitable for protecting electrical circuits against overloads and short circuits.
The circuit breaker has a rated insulation voltage of 440V AC and a supply voltage of 400V AC at 50Hz. Its switching capacity is 10kA according to EN 60898 and 15kA according to IEC 60947-2. The device is designed for DIN rail mounting and has a mechanical service life of 10,000 switching cycles.
Additional features include touch protection, sealability, and suitability for halogen-free environments. The connection terminals accommodate conductor cross-sections from 0.75 mm² to 25 mm² with a maximum tightening torque of 3.5 N·m. The unit dimensions are 121mm height, 54mm width, and 70mm depth, with an installation depth of 70mm.
The operational current rating is 40A at 30°C and 40°C.
The switching capacity is 10 kA according to EN 60898 and 15 kA according to IEC 60947-2.
The rated insulation voltage (Ui) is 440V AC, and the rated supply voltage is 400V AC.
This is a 3-pole miniature circuit breaker.
The tripping characteristic class is C.
The typical mechanical service life is 10,000 switching cycles.
The dimensions are 121 mm height, 54 mm width, and 70 mm depth.