The digital FI-protection switch Type B+ are for all systems, machines and devices in which DC fault currents can occur, e.g.:Dc applications such as photovoltaic or uninterruptible units- Medical devices such as x-ray devicesTest and experimental facilities in laboratory and training roomsFrequency converters for motor applicationsControls for lifts and cranesDrives with speed control for rolling machines, rotary benches, mills,â¦Workshops (for example, for the use of welding devices)- ConstructionCharging stations for electric cars.Type B+: Allstromsensitiver FI switch for applications, in which errors can occur. Not selective, not time-delayed. Protects in the event of all fault current forms. Also meets the requirements of the VDE 0664-400 0664-110 (formerly VDE V) for extended fire protection.This text is machine translated.