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The Siemens 5SJ4320-8HG42 is a 3-pole miniature circuit breaker designed for industrial and mechanical engineering applications. It offers a rated operational current of 20A and a switching capacity of 10kA according to EN 60898 standards, with a higher rating of 15kA per IEC 60947-2.
This circuit breaker operates with a D tripping characteristic and supports AC/DC voltage. Key electrical specifications include an insulation voltage (Ui) of 440V AC, a rated supply voltage of 400V AC, and maximum operating voltages of 277V AC (UL 489) and up to 125V DC (2-channel).
Designed for reliable protection, it features a mechanical service life of 10,000 switching cycles. The unit is suitable for environment B regarding EMC. It mounts on a standard DIN rail and has dimensions of 121mm height, 54mm width, and 70mm depth, with an installation depth of 70mm. The device also includes features like touch protection and is halogen-free and silicon-free.
The tripping characteristic is D.
The rated operational current is 20A at 30°C and 40°C, and the rated supply voltage is 400V AC (50 Hz), with a voltage rating of 480/277V AC per UL 489.
The switching capacity is 10 kA according to EN 60898 and 15 kA according to IEC 60947-2. The short-circuit breaking capacity per UL 1077 is 10 kA.
Yes, the product is halogen-free.
It mounts on a standard DIN rail.
Height 121 mm, width 54 mm, depth 70 mm, installation depth 70 mm. It occupies 3 modular width units.
It is approved by CCC, CE, CSA, EAC, UL, and VDE.