Legrand residual current circuit breaker DX3-ID, type B, universally sensitive, for alternating, pulsating and smooth direct residual currents, in accordance with VDE 0664-10, VDE 0664-11, VDE 0664-40, EN 61008-1, EN 61008-2-1, EN 62423, detection of residual currents in the frequency range 0 Hz to 1 kHz, short-time delayed, with high tripping threshold for increased operational safety (reduces false tripping), 4-pole, rated current In 40 A, rated residual current Idn 300 mA, rated voltage Un 400 VAC, rated frequency 50 Hz, rated short-circuit current 10 kA with suitable backup fuse, surge current resistant up to 3000 A, 4-module, fastening on top hat rail EN 60715 by quick fastening, clear information on the front of each device, clear red/green switch position indicator on the switch lever, with label window, with protection against misplacement for safe insertion of the conductor into the elevator terminal, attachment of auxiliary devices possible. Neutral conductor connection on the left. Use and application of all-current sensitive residual current circuit breakers for commercial and industrial installations with TT, TN-S and TN-CS systems in which power electronics equipment without galvanic mains isolation is used, such as systems with frequency converters. Areas of application are: photovoltaic systems/ pump, air conditioning and ventilation systems/ escalators and elevator systems/ medical devices/ welding systems/ UPS systems/ classrooms with experimental equipment/ construction sites with construction power distributors for connecting e.g. cranes/ fairground rides.