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The Siemens 5SY4120-7 is a single-pole miniature circuit breaker designed for reliable overcurrent protection in industrial and mechanical engineering applications. It operates with a rated current of 20A and a supply voltage of up to 400V AC, with a maximum DC operating voltage of 72V.
This circuit breaker offers a breaking capacity of 10kA according to EN 60898 and 20kA according to IEC 60947-2, ensuring safety under fault conditions. It features a Type C tripping characteristic, suitable for protecting circuits with moderate inrush currents. The device is designed for DIN rail mounting and has a protection class of IP20 when connected.
Key technical data includes an insulation voltage of 440V, a mechanical service life of 10,000 switching cycles, and an energy limitation class of 3. The unit dimensions are 90mm height, 18mm width, and 76mm depth, with an installation depth of 70mm. It supports conductor cross-sections from 0.75mm² to 35mm² for solid and stranded conductors.
The rated supply voltage is 400V AC for multi-phase operation and 230V AC for single-phase operation. The maximum operating voltage at DC is 72V.
The circuit breaker is designed for DIN rail mounting and has dimensions of 90mm height, 18mm width, and 76mm depth. It occupies 1 modular width unit.
The tripping characteristic is C curve.
The rated current is 20A at 35°C, derated to 18.78A at 40°C, 18.14A at 45°C, 17.48A at 50°C, 16.8A at 55°C, and 16.08A at 60°C.
The switching capacity is 10kA according to EN 60898, 20kA according to IEC 60947-2, and 5kA according to UL 1077.
The mechanical service life is 10,000 switching cycles typical.
The protection class is IP20.