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The Siemens 5SJ4120-8HG40 is a miniature circuit breaker (MCB) from the 5SJ4 series, designed for reliable circuit protection in industrial and mechanical engineering applications. This 1-pole device operates with a rated current of 20A and features a D-type tripping characteristic.
Key electrical specifications include a switching capacity of 10 kA according to EN 60898 and 15 kA according to IEC 60947-2. It is rated for a supply voltage of 400V AC and an insulation voltage of 440V AC. The breaker is designed for DIN rail mounting and has a compact width of 18mm, fitting one modular width unit.
Further technical details include a mechanical service life of 10,000 switching cycles and touch protection for user safety. The device is halogen-free, sealable, and silicon-free, contributing to its suitability in various environments. It supports conductor cross-sections from 0.75 mm² to 25 mm² with core end processing.
The rated supply voltage is 400V AC at 50 Hz. Under UL 489, the operating voltage is 120V AC or 60V DC.
The breaker has dimensions 90mm x 18mm x 70mm and mounts on standard DIN rail.
The tripping characteristic is D.
10 kA per EN 60898 and 15 kA per IEC 60947-2.
IP20 with connected conductors, IP40 in the handle range.
Yes, maximum 60 V DC per UL 489 and CSA C22.2.
Rated current is 20A at 30°C and 40°C, derated to 19.4A at 45°C, 18.8A at 50°C, 18.1A at 55°C, and 17.6A at 60°C.