EV charging stations should not be protected only at the charger terminal. A complete SPD design should consider the main distribution board, sub-distribution board, AC input of the charger, possible DC fast-charging section, communication lines, grounding system, and maintenance monitoring.
This guide is written for EV charger installers, charging station contractors, electrical engineers, panel builders, and OEM buyers who need a clear SPD selection path before project ordering.
- AC Input SPD
- Verteilungstafel-SPD
- Type 1+2 vs Type 2
- DC Fast Charger Review
- Schutz der Signalleitungen
- Remote Alarm
Inhaltsübersicht
Quick Answer: Where Should SPDs Be Used in an EV Charging Project?
For most commercial or public EV charging projects, SPD selection is not a single-device decision. Contractors should check each protection point from the incoming power supply to the charger, communication line, and monitoring system.
| Protection Point | Empfohlene SPD-Richtung | Contractor Meaning |
|---|---|---|
| Hauptanschlussverteilertafel | Use Type 1+2 SPD when there is external lightning protection, overhead supply, or high lightning exposure. Use Type 2 SPD for lower-risk supply conditions. | This is the first protection stage for the EV charging power supply. |
| Sub-distribution board near chargers | Use Type 2 SPD, coordinated with the upstream SPD. | This reduces residual surge before it reaches the charger input. |
| AC input of EV charger | Select single-phase or three-phase AC SPD by system voltage, earthing system, pole configuration, and installation position. | This protects charger electronics, power modules, metering, and control circuits from transient overvoltage. |
| DC fast charger section | Check the DC-side requirement case by case according to charger architecture, DC voltage, insulation design, and manufacturer approval. | Do not blindly use a PV DC SPD as a universal replacement for a DC fast charger. |
| Communication and control lines | Use suitable signal SPD for exposed Ethernet, RS485, metering, monitoring, or OCPP-related wiring. | Surges can enter through data lines, not only through the AC power line. |
| Remote alarm and maintenance system | Use SPD models with remote signal contact when the station has multiple chargers or needs centralized monitoring. | Maintenance teams can find failed SPD modules quickly without opening every cabinet. |
Einfache Regel: protect the incoming supply first, then protect downstream panels and charger inputs. For outdoor or public projects, also check the signal line, grounding, and remote alarm requirement before ordering.
Do EV Charging Stations Need Surge Protection?
Yes, EV charging stations normally need surge protection, especially for public charging points, outdoor chargers, commercial parking areas, fleet charging stations, and DC fast charger projects. EV chargers contain sensitive electronics, power conversion components, communication circuits, metering modules, and control boards.
Surge risk can come from nearby lightning activity, switching operations in the grid, long cable routes, poor bonding, overhead supply lines, and exposed communication wiring. A surge may not destroy the whole charger immediately, but it can damage control boards, communication ports, power modules, or monitoring circuits.
Wichtig: The correct SPD arrangement depends on local electrical code, lightning exposure, supply method, earthing system, charger type, distance between panels and chargers, and whether the site has an external lightning protection system.
SPD Installation Positions in an EV Charging Station
A reliable EV charging station should be checked as a system. The SPD should not be selected only by looking at the charger nameplate. Contractors should review where the surge may enter and how the surge current can be discharged safely.
Recommended SPD protection architecture for EV charging station projects.
Hauptverteilerschrank
This is the first protection stage for the EV charging supply. Use Type 1+2 when lightning current risk is expected, or Type 2 for lower-risk incoming supply.
Unterverteilungstafel
When chargers are supplied from a local sub-panel, a downstream Type 2 SPD helps reduce residual surge before it reaches the charger input.
AC Input of Charger
Select the SPD by AC system voltage, pole configuration, earthing system, discharge current rating, and remote signal requirement.
Signal and Monitoring Lines
Ethernet, RS485, metering, billing, or OCPP-related communication lines may need signal SPD, especially when cables run outdoors or between cabinets.
Standards and Installation Rules Contractors Should Know
In IEC-based EVSE projects, surge protection is often checked together with the electrical installation rules for EV charging equipment and the SPD product standard for low-voltage AC systems. This does not mean every site uses the same SPD arrangement. It means the contractor should confirm the site condition before choosing the SPD type.
| Reference Area | What It Means for EV Charging SPD Selection | Contractor Action |
|---|---|---|
| EVSE electrical installation rules | Public or commercial EVSE installations may require transient overvoltage protection depending on installation condition and local code. | Check whether the EVSE supply switchboard, sub-panel, or charger cabinet needs additional SPD protection. |
| IEC 61643-11 for AC SPD | AC low-voltage SPDs should be selected and documented according to the relevant SPD product standard and required certification scope. | Confirm Type 1+2 or Type 2, Uc, In, Imax, Iimp, Up, pole configuration, and certificate requirement. |
| Distance between upstream SPD and charger | When the charger is far from the upstream protection point, the downstream equipment may still see high residual surge stress. | Consider an additional Type 2 SPD near the EVSE or local sub-distribution board, especially for long feeder cable routes. |
| External lightning protection system or overhead supply | These conditions increase the need to consider lightning current discharge at the incoming side. | Review Type 1+2 SPD or coordinated Type 1 + Type 2 protection at the main incoming position. |
| Local inspection and project specification | Many EV charging projects have country-specific code, utility requirement, or consultant specification. | Ask the customer for the project specification before confirming the final SPD model. |
Practical rule for buyers: do not ask only for “EV charger SPD price”. Send the single-line diagram, installation position, charger distance, earthing system, and lightning exposure first. These details decide whether the project needs Type 1+2, Type 2, signal SPD, or remote alarm options.
Type 1+2 vs Type 2 SPD for EV Charging Stations
The choice between Type 1+2 and Type 2 SPD should follow the site risk and installation position. Do not choose Type 1+2 only because it sounds stronger. Also do not use Type 2 everywhere without checking lightning exposure and the upstream protection design.
Type 1+2 SPD and Type 2 SPD selection logic for EV charger supply panels.
| Project Situation | Better SPD Direction | Warum es wichtig ist |
|---|---|---|
| Building has external lightning protection system | Type 1+2 SPD at the main board or incoming EV supply panel | The main board may need to discharge lightning current and reduce residual surge for downstream equipment. |
| Outdoor charging station with high lightning exposure | Type 1+2 SPD or coordinated Type 1 + Type 2 protection | Outdoor chargers and long cable runs are more exposed to lightning-induced transients. |
| Indoor commercial AC charger supplied from protected board | Typ 2 SPD | Type 2 SPD is commonly used for induced surge and switching surge protection in distribution boards. |
| Charger is far from the main panel | Add Type 2 SPD near the charger or local sub-distribution board | Long feeder cables can increase residual surge stress at the EVSE side. |
| Signal cable runs outdoors or between cabinets | Signal SPD for the correct communication interface | Power SPD cannot protect low-voltage data lines correctly. |
For EV charging projects, the SPD type should be selected together with the protection location. A main incoming board, sub-panel, charger cabinet, and signal cabinet may need different protection devices.
AC Input SPD Selection for EV Chargers
For AC chargers and the AC input of DC fast chargers, the SPD should match the real power supply system. Contractors and panel builders should not order by “EV charger SPD” only. The supplier needs the electrical system information to recommend the correct model.
Key AC SPD Parameters to Confirm
- Systemspannung: 230V, 400V, 415V, or other local supply voltage.
- Phase type: single-phase or three-phase charger supply.
- Earthing system: TN-S, TN-C-S, TT, IT, or project-specific system.
- SPD-Typ: Type 1+2 or Type 2, depending on installation position and lightning risk.
- Konfiguration der Pole: 1P+N, 2P, 3P, 4P, 3P+N, or other arrangement required by the panel.
- Uc / MCOV: must match the continuous operating voltage of the system.
- In / Imax: nominal and maximum discharge current for Type 2 SPD selection.
- Iimp: impulse current rating for Type 1 or Type 1+2 SPD.
- Up: voltage protection level suitable for the charger and downstream electronics.
- Remote alarm: dry contact / remote signal option for maintenance monitoring.
For DIN rail AC SPD models, you can also review LEEYEE’s related AC SPD product pages: Type 2 DIN-Schienen-Überspannungsschutz und Type 1+2 DIN-Schienen-Überspannungsschutz.
DC Fast Charger Surge Protection: What Should Be Checked?
DC fast chargers need special attention because they include AC input, power conversion, DC output, control circuits, communication ports, and sometimes long cable routes. The AC input side normally follows AC low-voltage SPD selection logic. The DC side should be reviewed separately.
Do not blindly use a PV DC SPD for a DC fast charger. PV strings and EV DC fast chargers are different applications. DC-side protection depends on charger output voltage, converter architecture, insulation coordination, cable routing, enclosure design, and manufacturer approval.
Before selecting DC-side protection, confirm:
- DC output voltage range of the charger.
- Whether the DC side is accessible for external SPD installation.
- Internal converter and isolation design.
- Manufacturer’s approved protection scheme.
- Applicable project standard and local inspection requirement.
- Whether the risk is at AC input, DC output cable, communication line, or cabinet grounding.
Signal Line Surge Protection for EV Charging Stations
EV charging stations are not only power devices. They often connect to payment systems, load management systems, backend platforms, energy meters, PLCs, and monitoring devices. Surges can enter through these signal lines.
For signal protection selection, see: RS485 SPD Wiring and Selection Guide.
Grounding and Bonding Points Contractors Must Confirm
An SPD needs a reliable discharge path. If the earthing and bonding design is poor, the SPD may be installed in the cabinet but still fail to protect the EV charger effectively.
- Earthing system: TN-S, TN-C-S, TT, IT, or project-specific arrangement.
- PE conductor routing from main board to EVSE cabinet.
- Connection between metal charger enclosure and protective earth.
- Equipotential bonding between cabinets, metal structures, and parking area equipment.
- Earthing rod requirement for outdoor or independent charging points.
- Shortest practical SPD connection length to reduce residual voltage.
Remote Alarm, Visual Indicator, and Maintenance Replacement
EV charging stations usually have multiple chargers. In this situation, SPD maintenance should not depend only on someone opening every cabinet and checking the indicator window manually.
For remote alarm wiring, see: How to Connect SPD Remote Alarm Contact to PLC or Monitoring System.
EV Charging SPD Product Direction for Contractors and Panel Builders
After the project information is confirmed, the next step is to match the protection point with the right SPD product direction. This table is not a final model list. It helps contractors and OEM buyers prepare a clearer request before asking for a quotation.
For OEM or panel builder orders, LEEYEE can support AC SPD selection, signal SPD selection, remote alarm option, replacement module planning, product marking, and batch packaging requirements.
Before Ordering EV Charging Station SPDs: Contractor Checklist
If you are buying SPDs for an EV charging project, the supplier should not recommend a model only by charger power. Send the following information first. This helps avoid wrong Uc, wrong pole configuration, wrong SPD type, and missing remote alarm contacts.
Ordering checklist for EV charger installers, panel builders, and project buyers.
Related LEEYEE SPD Pages
These pages can help contractors and panel builders check the related SPD parameters before final selection.
FAQ: SPD Selection for EV Charging Stations
Does an EV charging station need an SPD?
Yes, EV charging stations usually need surge protection, especially for public, commercial, outdoor, fleet, and DC fast charging projects.
Where should the SPD be installed for an EV charger?
Common positions include the main distribution board, sub-distribution board near chargers, AC input of the charger, signal line, and monitoring circuit.
Should I use Type 1+2 or Type 2 SPD for an EV charging station?
Use Type 1+2 SPD at the main incoming board when the site has external lightning protection, overhead supply, or high lightning exposure. Use Type 2 SPD for downstream distribution boards and charger input panels.
Need Help Selecting SPDs for an EV Charging Project?
Send us your charger type, system voltage, earthing system, panel position, cable distance, and whether the site is indoor, outdoor, or protected by an external lightning protection system.
- ✓ AC input SPD selection
- ✓ Type 1+2 / Type 2 recommendation
- ✓ Signal line SPD direction
- ✓ Remote alarm contact option
- ✓ OEM label and packaging support
- ✓ Certificate and datasheet support
Note: Final SPD selection should follow the project drawings, local electrical code, charger manufacturer requirements, and site risk assessment.
