Ac power arrester surge protector Applications: C/d class surge protective device for ac power system. Sensitive electronic equipment Telecom centers Automatic control centers Intelligent mansions Industrial enterprises Medical institutes Features: Din rail mounting for easy installation Plug connectors for quick and easy connection or rewiring 40ka maximum surge current Thermal disconnect device Status indicators visually verify protection level Surge protection device with n-pe residual current spark gap as 3+1 circuit Specifications about m40b3+n Parameterm40dnpe50 Iec /vde level ii/c ii/c Nominal operating voltage 110/220v ac 500v(n-pe) Max. Continuous operating voltage 275v 61630;/250v Leakage current at 1ma