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DFS 4 063-4/0.03-A pulse- and AC-sensitive type A-function-residual current circuit-breakers (RCCB) are components for realising the protective measure "protection by automatic disconnection of the power supply" in accordance with the requirements of VDE 0100 Part 410 or corresponding international installation regulations. Devices in the DFS 4 series are compact two-pole or four-pole residual current circuit-breakers. In the standard version, they only occupy four division units. While the DFS 4 version for AC and pulsating DC residual currents is designed for three-phase networks, but can also be used in single-phase networks, there are special versions for single-phase or three-phase operation in the AC sensitive versions (type B, type B +). Despite their compact dimensions, a wide range of different tripping currents and characteristics are available for rated currents- up to 125 A, depending on the version. All devices are available in the "HD" version, which can be
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