5SY4220-8

The Siemens 5SY4220-8 is a miniature circuit breaker from the SENTRON product brand, designed for robust protection in mechanical engineering and industrial settings. This 2-pole device operates with a rated supply voltage of 400V AC and features a tripping characteristic class D.

With a switching capacity of 10kA according to EN 60898 and 20kA according to IEC 60947-2, it provides reliable short-circuit protection. The operational current is rated at 20A at 35°C, with derating at higher temperatures. The device supports a wide range of conductor cross-sections, from 0.75 mm² to 35 mm² for solid and stranded wires.

Mechanical specifications include a height of 90 mm, width of 36 mm, and depth of 76 mm, with an installation depth of 70 mm. It mounts via a quick assembly system onto a DIN rail. The circuit breaker is also halogen-free and silicon-free, contributing to environmental considerations in its application.

Key electrical features include an insulation voltage (Ui) of 440V AC and a maximum DC operating voltage of 72V. The protection class is IP20 with connected conductors. The typical mechanical service life is rated at 10,000 switching cycles.