According to VDE0100-722:2016, each connection point must be protected by its own residual current protective device of at least type A with a rated differential current no greater than 30 mA. Charging stations with sockets or vehicle couplings must also have protection against DC residual currents.

In a controller-extender configuration, several charging points are connected in series. One charging station acts as the controller. The communication controller (Single Board Computer short SBC) for controlling all charging points is integrated in the controller charging station. In addition, the connection to the backend runs via the controller. Within the system, load management can be operated with a specified maximum current so that exceeding the maximum current is prevented. Optionally, the consumption of an entire building can be measured and the charging infrastructure adapted.

The AC connectors have three different connector types.
Plug type 1 was developed in Japan for the vehicle side. It is designed for a single-phase charge with a maximum current of 32 A and a voltage of 250 V.
Plug type 2 was proposed in Germany for the vehicle and infrastructure side, which can charge single-phase (maximum 70 A) to three-phase (maximum 63 A) with a maximum voltage of 480 V. The connector type 2 is designed for a single-phase charge with a maximum current of 32 A and a maximum voltage of 250 V. The connector type 2 is designed for a single-phase charge with a maximum voltage of 480 V. This can be extended by a combo connector to charge up to 350 kW at a DC charging station.
Plug type 3 was developed in Italy and enables single to three-phase charging at a maximum current of 16 A or 63 A and a maximum voltage of 400 V. However, this variant has not been established and is hardly found anymore.
Type GB describes single-phase and three-phase charging in China. A special lever system ensures locking between the vehicle inlet and the vehicle charging plug.
Three connector types have also established themselves for DC charging plugs.
The Japanese standard CHAdeMO (20 kW - 400 kW) is mainly used in Japan, China and the USA along with the type GB/T 20234 which was developed in China but is not common in Europe. In addition, there is the CCS (Combined Charging System) plug, which is a combination of a type 2 plug and combo plug. This was declared a European standard by the EU in 2013.

Charging stations are divided into two different charging types: AC charging stations (alternating current) and DC charging stations (direct current). With AC charging stations, charging capacities between 3.7 and 44 kW are possible. The alternating current is converted into direct current inside the electric vehicle, by means of a rectifier, as the battery is charged with direct current. In the case of the DC charging stations, the current is already converted into direct current within the charging station. With this charging method, charging capacities of up to 350 kW are possible. For this reason, these charging stations are correspondingly more cost-intensive. DC charging stations are mainly used at motorway service stations, as a fast charging process is expected at these locations. In urban areas, the AC charging station has established itself as the standard.

Jeder Hardware-Hersteller kann verschiedene Backendbetreiber anbieten, die mit seinen Ladestationen kompatibel sind. ABL bietet die Möglichkeit, nahezu jedes Backend zu integrieren.