NDN Series MCBs 40A, 4Pole / Four Pole / FP 4 Modules D curve MCB (trips at 10-20 x Ir) Breaking Capacity: 10kA AC Operating Voltage: 415V AC Offers both Overaload and Shortcircuit protection Conforms to IS/IEC 60898-1-2002 & IEC60947-2 Typically used for specialty industrial / commercial uses where current inrush can be very high. Examples include transformers or X-ray machines, large winding motors etc