Why Does The EV Charger Need Leakage Protection?

Date:2022-12-10 Category:News

As we move into the era of electric vehicles, safety concerns about this technology are emerging. One of these concerns is the safety of EV Charger Manufacturers have implemented a safety regulation and standard that requires all EV chargers to have a leakage protection unit installed in every EV charging station. When you use any DC EV chargers or AC power, a high electric current can cause multiple damages to your vehicle’s electric system. If this occurs due to incorrect wiring or some other mistakes, this can damage your vehicle’s electric system components causing electric shock.

Why Does The EV Charger Need Leakage Protection?

The leakage protection device monitors the voltage and current of all the connected equipment and affects the output voltage or load based on the various fault modes. The monitoring range can be aided by using additional sensors to measure power, current, frequency, and voltage. This article explores EV leakage protection and the types of EV leakage protection devices available in the market.

What is the EV charger leakage protection?

The EV charger leakage protection device is a circuit designed to monitor the current and voltage of a charging station and take preventative actions in case of an abnormal condition. The purpose of this circuit is to protect the charging station from dangerous power fluctuations and over-voltages.

The EV charger leakage protection device monitors the current and voltage flowing between the EV charger and connected EV chargers.

The logic behind the monitoring process is that a too high or too low current or voltage can damage and destroy components in charge stations, so it is necessary to have a circuit that monitors these voltages. EV charger leakage protection devices protect you and other parts of your electric vehicle from electrocution and shock in case of an electric fault in your vehicle, charger or charging station.

The leakage protection system is a safety mechanism in charging stations that monitors the output voltage or load generated by various parts of the charging station to ensure the safety of consumers. By monitoring and controlling the electric current, this device ensures that there is no electric shock to the consumer.

2. How many EV charger leakage protection device types are on the market?

Manufacturer Declaration of integrated RcD type at Ev chargerExternal RCD installation meeting standard
External RCD installation recommended by our experts
Type-A 30mA RCD (IEC 61008-1/IEC 61009-1/IEC 60947-2)Type-B RCD (IEC 62423/ IEC 60947-2) or RDC-DD(IEC 62955)Type-B RCD (IEC 62423/ IEC 60947-2) or Type-EV RCD (IEC 61008-1/ IEC 61009-1+EC62955)
Type-A 30mA RCD(IEC 61008-1/ IEC 61009-1/ IEC 60947-2)+RDC-DD (IEC 62955)Not needed in theoryType-A 30mA RCD (IEC61008-1/IEC 61009-1 )
RDC-DD (IEC 62955)Type-A 30mA RCD (IEC61008-1/ IEC 61009-1 )Type-A 30mA RCD (IEC61008-1/IEC 61009-1 )
Type-B RCD (IEC 62423 / IEC60947-2)Not needed in theoryType-A 30mA RCD (IEC61008-1/IEC 61009-1 )

Type-A 30 mA RCD: The type-A 30 mA RCD is the most common and cheapest type of EV charger leakage protection device. The device works for DC and AC power. It is useful in protecting the charging station from any electrical shock or damage, especially when you plug in an EV charger rated higher than 30 amps, as this device has a maximum current of 30 mA. This RCD device is used in inverters, EV chargers, and lighting devices such as LED drivers.

Type AC RCD: These RCDs work in the same way as Type A RCDs. The only difference is that they only use AC power.

Type B RCD: The type B RCD device is a safety circuit used in the home and appliances, with maximum currents that range from 30 mA to 200 mA. The Type B RCD uses two residual current devices to monitor power. One RCD monitors the current, while the other RCD monitors the voltage. Type B RCD devices are commonly used in EV charging stations because they accommodate three-phase power. When the power in the grid increases to dangerous levels (more than ten mA), this RCD is triggered, disconnecting the power. The RCD is not triggered for low levels of power, which are not dangerous. Hence, your vehicle will continue to charge. It is more expensive compared to the type A RCD.

Type F RCD: These devices are used in devices that use frequencies, such as power tools, washing machines, and air conditioners. The Type F RCD correct faults are caused by multiple incidences that occur in the system.

The difference between TypeA RCD and the TypeB RCD

Type A RCD can sense and correct faults in AC and DC current. The Type B RDC also detects faults in AC and DC current. In addition, it can detect earth currents that the Type A RDC does not recognize. For example, if you leave your electric vehicle charging at night and a DC earth current leakage of 6mA happens, the Type A RCD will be triggered, disconnecting the power. You won’t realize this until morning when you wake up and realize your car has not charged. This leakage can blindside the type A RCD because the RCD-DD senses only AC current. In the case of a type B RCD, a 6mA voltage leak will not trigger the RCD. The Type RCD will not be blindsided like the type A RCD. This is because this amount of power is not dangerous. Higher levels of dangerous current leaks will only trigger the type B RCD.

The Type B RCD is used in high-frequency devices, such as EV charging stations, while the Type A RCD is used in devices that run on medium and high frequencies, such as household appliances.


When looking for an EV charger, you must ensure that you buy an EV charger with the correct safety features. It is also important to use the correct type of EV charger RCD. This is because it monitors and kills the power if you do not plug in an EV charger with a higher current. New standards have been introduced which require manufacturers to ensure that all the EV chargers produced have the right safety features. If an EV charger does not have the correct safety features, it is not supposed to be used. The RCD safety feature comes in handy when a short-circuiting occurs on the charging station.

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