Residual current circuit breaker, all-current sensitive Acti 9 iID. 4-pole, nominal current 40A, type B-SI, nominal residual current 300mA, operating voltage (Ue) 400 AC, 50Hz, insulation voltage 500V AC. Snap action for low-wear switching of the contacts. With mechanical front-side fault signal indicator (VisiTrip) to indicate tripping due to residual current. Safe contact indicator (VisiSafe) of the residual current circuit breaker, green indicator ensures that there is no voltage on the output side. Test button for regular function testing. Double connection terminals for connecting cables or phase rails on both sides. Easy removal of the individual device when the phase rail is installed, thanks to the fastening element accessible from the front. Additional auxiliary modules that can be added (optional) undervoltage release (iMN), overvoltage release (iMSU), shunt release (iMX), auxiliary switch for status reporting (iOF), fault reporting switch (iSD). Type B-SI has integrated SI technology, which offers greater resistance to electrical interference. Protects against smooth DC fault currents in 1- or 3-phase supply networks caused by frequency converters, inverters &, emergency power supply. Color RAL 9003. Meets the following standards IEC/EN 61008-2-1,IEC/EN 62423,IEC 61543,VDE 0664.