FI type B is already installed in all of our wallboxes and chargers in the form of a so-called RCMU (in the form of a ring through which the cables are routed). This protects people not only from alternating current errors (AC), but also from (DC) direct current residual currents which occur when charging an electric car. The 6mA DC protection, which is built into all of our products, protects you from external costs in the form of FI type B all-current sensitive in the amount of 249,-.
FI type A is the name given to the standard household residual current circuit breaker. Since it can only detect alternating current (AC) errors, it is unsuitable for protecting a wallbox where DC residual currents can also arise.