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The four EV charging modes in IEC 61851 describe how an electric vehicle connects to the electricity supply, what equipment controls the connection, and where the AC-to-DC charging conversion takes place. They do not rank charging speed from slow to fast.
That distinction matters when comparing a household socket, a portable charging cable, a home wallbox and a motorway rapid charger. Modes 1 and 2 use AC from an ordinary socket, Mode 3 uses dedicated AC charging equipment, and Mode 4 uses an external charger to deliver controlled DC directly to the vehicle.
Which IEC 61851 standard is current?
The relevant document is IEC 61851-1:2017, Electric vehicle conductive charging system — Part 1: General requirements. It is the third edition and applies to EV supply equipment for electric road vehicles, including plug-in hybrids, with rated supply voltages up to 1,000 volts AC or 1,500 volts DC.
IEC also lists IEC 61851-1:2017/COR1:2023, a corrigendum published on November 29, 2023. References that describe IEC 61851-1:2010 as the current edition are therefore out of date.
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The mode classification covers the electrical connection, control signalling and safety arrangement between the vehicle, EV supply equipment (EVSE) and the supply network. The actual charging power still depends on voltage, current, number of phases, the EVSE rating, the car’s onboard charger and the available capacity of the installation.
IEC 61851 charging modes at a glance
| Mode | Power delivered to the car | Connection | Where the main charger is | Typical use |
|---|---|---|---|---|
| Mode 1 | AC | Ordinary AC socket, with no EV-specific pilot signalling | Inside the vehicle | Limited or emergency use |
| Mode 2 | AC | AC socket with an in-cable control and protection device | Inside the vehicle | Portable charging from a domestic or other non-dedicated outlet |
| Mode 3 | AC | Dedicated, permanently connected AC EVSE | Inside the vehicle | Home wallboxes and public AC charge points |
| Mode 4 | DC | Dedicated DC EVSE, normally with a tethered cable | Inside the charging station | DC fast and high-power charging |
Mode 1: direct AC connection to an ordinary socket
Mode 1 connects the vehicle directly to an AC supply through a standard socket-outlet. There is no communication with a charging station and no supplementary control-pilot or auxiliary contact in the vehicle-to-socket connection.
The vehicle’s onboard charger converts the incoming AC into DC for the battery. The cable is essentially a power cable; it is not a Mode 2 cable with a control box.
What Mode 1 does not provide
- No EVSE control-pilot negotiation with the vehicle.
- No EV-specific current advertisement from a charging station.
- No in-cable control and protection device of the type used for Mode 2.
That does not mean every Mode 1 installation has the same power limit. The safe current depends on the socket, wiring, voltage, phase arrangement, circuit protection and national electrical rules. A socket that appears suitable may still be unsuitable for a high, continuous EV load.
Potential problems include a hot plug or socket, loose terminals, aged wiring, overloaded circuits, extension leads and unsuitable adapters. An EV can draw power for many hours, making a marginal domestic connection more demanding than short-term household use.
National rules may also restrict Mode 1. For example, UK government guidance describes Mode 1 as emergency-use-only equipment and says it should not be installed for EV charging in covered car parks. That is a national safety position for the stated context, not a universal IEC definition that bans Mode 1 everywhere.
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Mode 2: AC charging with an in-cable control box
Mode 2 also takes AC from a socket, but the cable contains an EVSE control and protection device. This is commonly called an IC-CPD (in-cable control and protection device), portable EVSE or, less precisely, a portable charger.
The IC-CPD provides control-pilot signalling between the vehicle and the cable equipment, along with protection against electric shock. In UK guidance, this includes an RCD function and the control-pilot function used with the Mode 2 EV charging equipment.
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How to identify Mode 2
- Start at the wall socket or other AC outlet.
- Follow the charging lead towards the vehicle.
- Look for a substantial in-line control and protection unit with status indicators, buttons or a display.
- If that unit is part of the charging harness and provides the EV control and protection functions, the arrangement is Mode 2.
A domestic plug alone does not prove that a cable is Mode 2. Conversely, the defining feature is the in-cable EVSE arrangement, not the shape of the vehicle connector.
Common Mode 2 limitations
- The socket remains important: the IC-CPD cannot fix a loose terminal, damaged outlet, undersized cable or overloaded circuit.
- Protection must be coordinated: the portable unit’s RCD and other functions do not remove the need for a correctly designed upstream circuit.
- The lowest rating wins: the socket, circuit, cable, IC-CPD and vehicle onboard charger may all impose different limits.
- There is no universal IEC power figure: Mode 2 does not automatically mean 3.7 kW. National rules and equipment ratings may set different limits. UK covered-car-park guidance, for example, describes a Mode 2 EVCP as not exceeding 15 kW in that context.
Using a Mode 2 cable at home can be practical for occasional charging, but a properly installed dedicated wallbox is generally a more controlled solution for regular high-current charging.
Mode 3: dedicated AC charging equipment
Mode 3 connects the vehicle to AC EVSE that is permanently connected to the AC supply network. This is the arrangement used by most home wallboxes and public AC charge points.
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The control-pilot function extends between the EVSE and the vehicle. The charge point can keep its internal contactor open until the required connection and signalling states are present, then control safe energisation. The vehicle still converts AC to battery DC using its onboard charger.
Tethered and untethered Mode 3 charge points
Mode 3 equipment may have:
- A tethered cable permanently attached to the charge point.
- A socket-outlet into which the driver plugs a detachable charging cable.
A socketed Type 2 wallbox is therefore still Mode 3. A detachable cable does not turn a dedicated AC charge point into Mode 2.
Type 1, Type 2 and similar labels describe connector systems under the IEC 62196 series. They do not define the charging mode by themselves. Type 2 is commonly associated with Mode 3 AC charging, but the mode depends on the complete EVSE arrangement and its control functions.
How fast is Mode 3?
Mode 3 has no single charging speed. It can be single-phase or three-phase, and the result depends on the EVSE, cable, circuit, grid connection and vehicle.
For illustration, AC charge points may be rated around 3.5–7 kW, 7–23 kW, 23–43 kW or 43–44 kW in particular procurement categories. Those figures are examples from a UK government specification, not universal IEC limits.
A car with a 7 kW onboard charger will not take 22 kW simply because it is plugged into a 22 kW three-phase wallbox. The car may also charge below its maximum because of battery temperature, state of charge or other vehicle controls.
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Mode 4: DC charging from an off-board charger
Mode 4 connects the vehicle to DC EVSE. The main power conversion equipment is outside the car: the charging station converts electricity to controlled DC and supplies it to the vehicle’s battery system.
This is the arrangement used by DC fast, rapid and high-power public chargers. The cable is normally tethered to the charging equipment because the cable and connector form part of the station’s high-current DC system.
Mode 4 is not defined by a particular power threshold. A label such as “50 kW”, “rapid” or “ultra-rapid” describes a commercial or regulatory category, not the IEC mode itself. DC EVSE requirements are covered primarily by IEC 61851-23:2023, while digital communication for conductive DC charging is covered by IEC 61851-24:2023.
What happens during a Mode 4 session?
- The vehicle and station establish the required control and communication states.
- The station checks conditions such as connector status, isolation and permitted voltage and current.
- The station closes its power contactors only when the connection is considered safe.
- Charging current is adjusted as the car reports changing battery requirements.
- The station reduces or stops output if the vehicle, connector, cable or charger reaches a limit.
The station’s advertised peak output is not a guaranteed session power. The vehicle may request less than the charger’s maximum, and charging commonly tapers as the battery approaches a high state of charge. Battery temperature, station load, cable temperature and connector limits can also reduce power.
Connector and communication compatibility matters as well. A DC connector that physically appears suitable is not necessarily compatible with every EV or charging network.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why charging mode is not the same as charging speed
Consider three examples:
- A 3.6 kW portable Mode 2 cable is slower than an 11 kW Mode 3 wallbox.
- A high-power three-phase Mode 3 AC point can provide more power than a low-power Mode 4 DC unit.
- A Mode 4 station rated at 150 kW may deliver far less when the car’s battery is cold or nearly full.
The mode tells you how the car is connected and controlled. To estimate charging time, you also need the usable battery capacity, the car’s maximum AC or DC intake, the EVSE output, the electrical supply and the charging curve.
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Common IEC 61851 mode misunderstandings
| Claim | What is more accurate |
|---|---|
| “Modes 1 to 4 are charging speeds.” | They classify the connection, control and safety arrangement. |
| “Mode 3 always has a tethered cable.” | Mode 3 may use either a tethered cable or a dedicated socket. |
| “A Type 2 connector is Mode 3.” | Type 2 identifies a connector system; the complete EVSE arrangement determines the mode. |
| “Mode 4 means any fast charger.” | Mode 4 specifically involves controlled DC supplied by DC EVSE. High-power AC remains Mode 3. |
| “The Mode 2 brick is the car’s charger.” | For AC charging, the main charger is onboard the vehicle. The portable unit is EVSE and protection equipment. |
| “Mode 4 always means at least 50 kW.” | Mode 4 has no universal 50 kW minimum. |
| “Mode 1 is prohibited everywhere.” | IEC defines the mode; national electrical and building regulations decide where it may be used. |
How to identify the mode of an EV charging setup
- Check whether the vehicle receives AC or DC. AC normally indicates Mode 1, 2 or 3; controlled DC indicates Mode 4.
- Look for an in-cable control box. An ordinary socket plus an IC-CPD points to Mode 2.
- Check whether the EVSE is dedicated and permanently connected. A wallbox or public AC charge point is normally Mode 3.
- Check where the power conversion occurs. In Modes 1–3, the vehicle’s onboard charger converts AC. In Mode 4, the external station does the main conversion.
- Do not use connector shape as the only test. Type 1 and Type 2 labels identify connector families, not charging modes.
For installation decisions, the mode is only one part of the assessment. The circuit design, protective devices, earthing arrangement, cable rating, local rules and vehicle specifications must also be checked by a suitably qualified installer.
FAQ
Are EV charging Modes 1, 2, 3 and 4 different charging speeds?
No. IEC 61851 modes classify the electrical connection, control signalling and safety arrangement. Charging speed depends on the EVSE, electrical supply, vehicle limits, battery condition and other factors.
Is a home wallbox Mode 2 or Mode 3?
A permanently connected AC wallbox is normally Mode 3. A portable cable plugged into a household socket and fitted with an in-cable control and protection device is Mode 2.
Is DC fast charging always Mode 4?
Controlled DC charging from dedicated DC EVSE is Mode 4. However, “fast” and “rapid” are not precise IEC mode definitions, and AC charging can also be marketed as fast while remaining Mode 3.
Does a Type 2 plug automatically mean Mode 3 charging?
No. Type 2 describes a connector system under IEC 62196. The charging mode depends on the complete connection, including the EVSE, control-pilot function and whether the supply is AC or DC.
The Bottom Line
Mode 1 is a direct AC connection with no EV-specific control, Mode 2 adds an in-cable control and protection device, Mode 3 uses dedicated AC EVSE, and Mode 4 uses external DC charging equipment. They describe charging architecture—not a four-step speed scale. For regular home charging, the practical comparison is usually a portable Mode 2 cable versus a properly installed Mode 3 wallbox; for public high-power charging, the arrangement is generally Mode 4.
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