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This Siemens 5SJ4120-7HG40 is a 1-pole miniature circuit breaker designed for reliable circuit protection. It operates with a rated current of 20A and a voltage rating of 400V AC/DC, with a maximum AC operating voltage of 120V according to UL 489 and CSA C22.2 No. 5-02.
The breaker features a C tripping characteristic and a significant short circuit breaking capacity of 14kA according to UL 1077 and CSA C22.2 No.235, and 10kA according to EN 60898. It is suitable for mechanical engineering and industrial applications.
Designed for easy installation, the 5SJ4120-7HG40 mounts on a standard DIN rail and has a width of 18mm, corresponding to one modular width unit. It offers touch protection and is sealable. The conductor connection terminals accommodate finely stranded conductors with core end processing from 0.75 mm² to 25 mm², with a maximum tightening torque of 3.5 N·m.
Environmental considerations include an IP20 protection class with connected conductors and IP40 in the handle range. It is also halogen-free and silicon-free.
The rated voltage is 400 V AC. Maximum operating voltage is 120 V AC according to UL 489 and CSA C22.2 No. 5-02, and 60 V DC.
Rated current is 20 A at 30 °C and 40 °C, derated to 19.4 A at 45 °C, 18.8 A at 50 °C, 18.1 A at 55 °C, and 17.6 A at 60 °C.
It has a C tripping characteristic.
It is a 1-pole miniature circuit breaker.
Rated switching capacity is 10 kA according to EN 60898 and 15 kA according to IEC 60947-2. Short-circuit breaking capacity is 14 kA at AC according to UL 1077 and CSA C22.2 No. 235.
It mounts on a DIN rail and occupies one modular width unit of 18 mm.
Power loss is 2.4 W per pole at rated current in hot operating state at AC.