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This Siemens SENTRON 5SY4120-8 is a single-pole miniature circuit breaker designed for electrical protection in industrial and mechanical engineering applications. It operates with a rated supply voltage of 400V AC and has an operational current rating of 20A at 35°C.
The circuit breaker features a Type D tripping characteristic, suitable for applications with high inrush currents. Its switching capacity is rated at 10kA according to EN 60898 and 20kA according to IEC 60947-2. The device offers a mechanical service life of 10,000 switching cycles.
Designed for convenience, the 5SY4120-8 supports quick assembly system mounting on a DIN rail and has a compact width of 18mm, occupying one modular width unit. It includes touch protection and combined terminals at both the top and bottom for versatile connections. The conductor cross-section range for solid and stranded conductors is 0.75 mm² to 35 mm².
Environmental considerations include halogen-free and silicon-free construction. The circuit breaker meets various standards including IEC/EN 60898-1 and IEC/EN 60947-2, with approvals from CCC, CE, EAC, UR, and VDE.
The rated operational current is 20A at 35°C, decreasing at higher temperatures.
The rated supply voltage is 400V AC.
The switching capacity is 10kA according to EN 60898 and 20kA according to IEC 60947-2.
It has a Type D tripping characteristic.
It is a single-pole (1P) circuit breaker.
The dimensions are 90mm height, 18mm width, and 76mm depth, with an installation depth of 70mm.
Solid and stranded conductors from 0.75 mm² to 35 mm² can be connected. Finely stranded conductors with core end processing up to 25 mm².