Type A vs Type B RCD for EV Chargers
Short answer
RCD selection for EV chargers depends on the charger design and local electrical rules. Type A RCD is common in many AC installations, but EV charging can involve DC leakage current. Some projects require Type B RCD or Type A plus 6mA DC leakage detection, depending on standards, market, and product design.
Why RCD choice matters
An RCD is a safety device that helps detect leakage current. EV charging equipment can create installation-specific safety requirements, especially where DC residual current may affect protection performance. Choosing the wrong protection approach can create compliance risk, installation rejection, or safety concerns.
Buyers should not choose RCD protection only by price. They should confirm local rules with electricians or project engineers and then match the charger model, datasheet, and installation documentation to that requirement.
RCD comparison table
| Item | Buyer note |
|---|---|
| Type A RCD | Often used for AC residual current protection, but may need additional DC leakage detection for EV charging. |
| Type B RCD | Designed to detect AC and smooth DC residual current, but usually costs more and depends on local requirement. |
| 6mA DC detection | Some EV charger designs include 6mA DC leakage detection, which may allow a Type A installation path in some markets. |
| Market rule | Installer and buyer must confirm the applicable local standard before ordering or installing chargers. |
| Documentation | Datasheet, wiring guide, certification notes, and installation manual should match the selected protection approach. |
Where this matters most
RCD selection matters for AC wallbox chargers, portable EV chargers, apartment charging, commercial parking, workplace charging, and any project where installers must pass local electrical inspection. It is also important for distributors because incorrect protection wording can create after-sales disputes.
How buyers should evaluate RCD requirements
Before confirming an EV charger order, buyers should ask the installer which residual current protection path is accepted for the target country and installation type. A distributor selling the same charger into several markets may need different documentation, labels, and installation guidance. A project for private homes, apartment parking, workplace charging, or commercial public parking can also have different inspection expectations.
RCD wording should be specific in the quotation. Instead of asking whether a charger is simply safe, buyers should ask whether the product includes 6mA DC leakage detection, whether external Type A or Type B protection is expected, and how the installation manual explains the protection arrangement. This reduces the risk of buying hardware that later creates installation disputes.
Common buyer questions
Can Amprisen decide which RCD is legally required in my country?
Amprisen can help match charger configuration and documentation, but the legal requirement should be confirmed by the local installer, engineer, or applicable electrical code.
Is Type B always better than Type A?
Type B has broader detection capability, but it is not always the practical or required choice. Cost, charger design, 6mA DC leakage detection, and local rules all matter.
What should I send before asking for an RCD-related charger recommendation?
Send the target country, installation type, charger model, phase, power, local electrical requirement if known, and whether the project needs Type A, Type B, or 6mA DC leakage detection documentation.
Related products: AC EV Charger Wallbox Series, Athena Portable EV Charger Series, and AC EV Chargers.
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Project notes for EV charging buyers
EV charging project notes and buyer guidance
Use this article to understand product selection, market standard, and project requirements before contacting Amprisen.
Main topic
Commercial Charging, EV Charger, Home Charging, Portable Charging
Product relevance
Related product: AC EV Charger Wallbox Series
Next step
Share target market, connector standard, power range, quantity, certification, and backend requirements before quotation.
Buyer checklist
| Market | Residential, commercial, fleet, or public charging |
|---|---|
| Specification | Connector, power, communication, certification |
| Outcome | A clearer product shortlist and quotation request |
Related solution pages
Use these links to move from article context to actual product evaluation.