Charging Connectors

There is no single global EV charging connector. Instead there are half a dozen regional standards, each defining the physical plug, the maximum voltage and current it can carry, and the low-level communication protocol between vehicle and charger. For a battery or pack engineer this matters beyond “which plug fits” — the connector standard sets the ceiling on charge power the pack and BMS need to be designed against, and increasingly it also carries the metadata (state of charge, temperature, requested current) that drives the charge algorithm.

This page covers the connectors used to charge the vehicle from outside — AC and DC, light-duty and heavy-duty. For the connectors, busbars and bolted joints used inside the pack itself, see Connectors.

AC Connectors

Type 1 (SAE J1772 / IEC 62196 Type 1) — the five-pin single-phase AC connector standard in North America and, historically, Japan. Rated up to 240 V, with current from 16 A up to 80 A on split-phase installations, giving a practical ceiling around 19.2 kW.[1] It uses a control pilot (CP) and proximity pilot (PP) pair to negotiate available current with the vehicle.

Type 2 (IEC 62196-2, “Mennekes”) — the AC standard across Europe, Australia, and most markets outside North America and China. Unlike Type 1 it supports three-phase AC, giving it a maximum AC power of 43 kW where three-phase supply and a suitable on-board charger are available.[2] Selected by the European Commission in 2013 as the mandated AC connector for the EU.[2]

GB/T 20234.2 — China’s AC standard. Physically similar to Type 2 but with male/female genders reversed and different signalling (CC/CP rather than PP/CP), so the two are not interchangeable without an adapter.[3] Rated to around 27.7 kW at 440 V single-phase.[3]

DC Fast Charging Connectors

CCS1 (Combo 1) — adds two DC pins beneath the Type 1 AC connector. The long-standing DC fast-charge standard in North America, mandated for NEVI-funded public charging, and rapidly being superseded there by NACS.[4] Rated to 1,000 V and up to 500 A on liquid-cooled cable, giving a practical ceiling around 350 kW, though most deployed hardware sits at 50–150 kW.[5]

CCS2 (Combo 2) — the European counterpart, adding DC pins beneath the three-phase Type 2 connector. Mandated across the EU under the Alternative Fuels Infrastructure Regulation, and the dominant DC standard across Europe, Australia and much of Asia-Pacific.[6] Same 1,000 V / 500 A electrical envelope as CCS1; deployed sites up to 350 kW are common, with some corridor chargers demonstrating up to ~500 kW using additional cable cooling.[6]

CHAdeMO — Japan’s DC standard, and the first widely deployed DC fast-charge connector. CHAdeMO 2.0 extends the electrical envelope to 1,000 V and 400 A (~400 kW), and CHAdeMO was an early mover on bidirectional charging (V2G/V2H).[7] Adoption outside Japan is now limited to legacy vehicles (Nissan Leaf, Mitsubishi Outlander PHEV) as networks shift to CCS and NACS.[8]

GB/T 20234.3 / .4 — China’s DC standard. The original 2015 revision caps out at 1,000 V and 250 A (~250 kW); the 2023 revision raises this to 1,500 V and 800 A, on a path to the joint China–Japan ChaoJi connector (GB/T 20234.4), targeting up to 1.2 MW and designed for backward compatibility with both GB/T and CHAdeMO via adapter.[9]

NACS (SAE J3400) — Tesla’s connector, opened to the industry in 2022 and formally standardised by SAE in 2023.[10] A single compact 5-pin design carries both AC and DC on shared pins, distinguishing it from the AC/DC-combo approach of CCS. Following commitments from Ford, GM, Rivian, Hyundai and most other major automakers, NACS is displacing CCS1 as the default North American connector, with native ports appearing from the 2025–2026 model years — though as of mid-2026 many vehicles still ship with CCS1 and use an adapter for Supercharger access.[11]

Heavy-Duty and Future: Megawatt Charging

Light-duty DC standards top out in the 350–500 kW range — adequate for passenger EVs but far too slow for a heavy-duty truck with a 600+ kWh pack. The Megawatt Charging System (MCS), developed by CharIN and standardised as SAE J3271 / IEC TS 63379, extends the CCS architecture to 1,250 V and up to 3,000 A — a peak of 3.75 MW — enabling a 20–80% charge on a heavy-duty truck pack in under 30 minutes.[12] Three connector configurations trade off cooling complexity against current: an uncooled configuration to 500 A (~625 kW), a partially cooled configuration to 1,500 A, and a fully liquid-cooled configuration for the full 3,000 A.[13] A ruggedised variant (R-MCS) raises the voltage ceiling to 1,500 V for mining and off-highway use, and an “Extreme MCS” concept aimed at the largest mining dump trucks targets around 8 MW.[14] First commercial MCS sites are expected from 2027–2028, with truck OEMs including Mercedes-Benz and MAN already testing under real-world conditions.[14]

The Communication Layer

Increasingly, the connector is only half the story. CCS and MCS both carry ISO 15118 over power-line communication, which — beyond basic current negotiation — enables Plug & Charge authentication and bidirectional power flow for V2G.[15] This communication layer, and what it means for pack-level charge strategy, deserves its own treatment rather than a paragraph here — see the future charging roadmap for where this is heading.

Connector Comparison

Figures are standard ceilings, not typical deployed power — most public DC sites run well below the maximum the connector standard permits.

Where This Fits

The connector and its communication protocol set the external boundary condition for everything upstream in the pack: Fast Charging covers what happens once current is flowing, Electric Vehicle On Board Charger covers the AC-to-DC conversion path, and 800V Architecture covers why pack voltage class determines how much of a given connector’s power ceiling a vehicle can actually use.

References

1. SAE J1772 — Electric Vehicle Conductive Charge Coupler, SAE International
2. IEC 62196-2 — Plugs, socket-outlets, vehicle connectors and vehicle inlets, Part 2
3. GB/T 20234.2 — Connection devices for conductive charging of electric vehicles, Part 2
4. National Electric Vehicle Infrastructure Standards and Requirements, Federal Highway Administration final rule
5. IEC 62196-3 — dimensional compatibility for DC and combined AC/DC couplers
6. Regulation (EU) 2023/1804 — Alternative Fuels Infrastructure Regulation (AFIR)
7. CHAdeMO Association — CHAdeMO 2.0 specification
8. CCS vs CHAdeMO regional adoption guide, CZT Connectors, 2026
9. ChaoJi / GB/T standards released, CHAdeMO Association, September 2023
10. SAE J3400 — North American Charging System, SAE International
11. SAE J3400 Charging Connector, Joint Office of Energy and Transportation
12. Megawatt Charging System, CharIN; SAE J3271 Technical Information Report, March 2025
13. IEC TS 63379:2026 — Megawatt Charging System connector specification
14. Ruggedized Megawatt Charging System whitepaper v1.1, CharIN
15. ISO 15118-20:2022 — Vehicle to grid communication interface

See also: IEC 62752, IEC 62840-2, IEC 61851-1, IEC 63110-1, Electric Vehicle Charging, Daimler eActros LongHaul