For over a decade, North American EV charging was split between two DC fast charging connectors: CCS1 (Combined Charging System) used by most automakers, and Tesla's proprietary connector used exclusively on Tesla vehicles. In 2022, Tesla opened its connector design to the industry under the name NACS (North American Charging Standard). By 2023, every major North American automaker had announced a switch to NACS — and in 2023, SAE International standardized it as SAE J3400.
This shift is the most significant change to EV charging infrastructure since CCS was introduced. Understanding what NACS is, how it differs from CCS1, and what the transition means for charging networks and connector manufacturers is essential for anyone working in the EV space.
NACS vs CCS1: Quick Answer
If you need the fast answer, NACS (SAE J3400) is the connector standard winning new North American vehicle programs, while CCS1 still matters because the installed vehicle base and charging infrastructure are large and will remain in service for years. During the transition, most charging projects still need to support both.
| Comparison point | NACS (SAE J3400) | CCS1 |
|---|---|---|
| Physical format | Smaller, lighter, 3-pin design | Larger 7-pin combined AC/DC design |
| Max theoretical DC power | 500 kW | 500 kW |
| AC charging | Yes | Yes |
| Communication | CAN bus today, with broader feature support being added through the standard | PLC with ISO 15118 ecosystem |
| Best fit in today's market | New North American EV programs and future-facing charging rollouts | Existing non-Tesla fleet support and mixed-connector sites |
For connector sourcing and infrastructure planning, the practical takeaway is: design around NACS for the North American future, but keep CCS1 compatibility in the transition window unless you are serving a tightly controlled fleet.
What Is the NACS Connector?
NACS (North American Charging Standard) is the connector design that Tesla developed for its vehicles and Supercharger network. Tesla used this connector on all North American vehicles from the Model S (2012) onward.
In November 2022, Tesla published the NACS connector specification and made it available royalty-free to the industry. The move was widely interpreted as a strategic play to establish Tesla's connector as the North American standard — which is exactly what happened.
In June 2023, SAE International adopted NACS as SAE J3400, giving it official standards body recognition. This was the formal step that enabled other automakers to commit to the standard.
NACS Physical Characteristics
- Pins: 3 (two power pins + one signal/communication pin)
- Dimensions: Significantly smaller and lighter than CCS1
- Locking: Mechanical latch on the vehicle inlet
- AC charging: Supported (Level 1 and Level 2)
- DC fast charging: Supported (up to 1,000V, 500A = 500 kW theoretical)
- Communication: CAN bus over the signal pin
The NACS connector handles both AC and DC charging through the same three-pin interface — a simpler design than CCS1, which adds two large DC pins below the AC connector.
What Is the CCS1 Connector?
CCS1 (Combined Charging System, Combo 1) is the DC fast charging standard used by most non-Tesla automakers in North America. It combines a Type 1 (SAE J1772) AC connector with two additional DC pins below.
CCS1 has been the dominant non-Tesla DC fast charging standard in North America since around 2013. The CharIN consortium, which includes BMW, Daimler, Ford, GM, Volkswagen, and others, developed and promoted CCS globally.
CCS1 Physical Characteristics
- Pins: 7 (5 AC pins from J1772 + 2 DC pins)
- Dimensions: Larger and heavier than NACS
- AC charging: Supported via the J1772 portion
- DC fast charging: Up to 350 kW (current infrastructure)
- Communication: PLC (Power Line Communication) via ISO 15118
NACS vs CCS1 Technical Differences
| Parameter | NACS (SAE J3400) | CCS1 |
|---|---|---|
| Pin Count | 3 | 7 |
| Connector Size | Compact | Large |
| Max DC Voltage | 1,000V | 1,000V |
| Max DC Current | 500A | 500A |
| Max Theoretical Power | 500 kW | 500 kW |
| AC Charging | Yes (L1 and L2) | Yes (via J1772 portion) |
| Communication Protocol | CAN bus | PLC (ISO 15118) |
| Plug & Charge | Yes (ISO 15118-20 planned) | Yes (ISO 15118) |
| V2G Support | Planned | Yes (ISO 15118-20) |
| SAE Standard | SAE J3400 | SAE J1772 + SAE J2847 |
The most visible difference is size. NACS is substantially smaller and lighter than CCS1, making it easier to handle — particularly for users with limited mobility. The simpler three-pin design also reduces the number of potential failure points.
The communication protocol difference is more significant for infrastructure developers. CCS1 uses Power Line Communication (PLC) based on ISO 15118, which enables Plug & Charge (automatic authentication) and V2G (vehicle-to-grid) bidirectional power flow. NACS currently uses CAN bus communication; ISO 15118 support is being added to the SAE J3400 specification to enable equivalent features.
Why North America Is Shifting to NACS
The adoption of NACS by major automakers happened rapidly:
- Ford (May 2023): First non-Tesla OEM to announce NACS adoption. Ford EVs from 2025 onward use NACS inlets.
- GM (June 2023): Announced NACS adoption for 2025 model year vehicles.
- Rivian, Polestar, Volvo, Honda, Nissan, Toyota, Subaru, Jaguar (2023): All announced NACS adoption.
- SAE J3400 (June 2023): Official standardization.
By the end of 2023, virtually every major automaker selling EVs in North America had committed to NACS. The transition effectively ended CCS1 as the future standard for new North American vehicles.
Why Did Automakers Switch?
Several factors drove the rapid adoption:
Tesla Supercharger network access: Tesla's Supercharger network is the largest and most reliable DC fast charging network in North America. Adopting NACS gives non-Tesla EV owners access to this network (with an adapter or native NACS inlet).
Connector simplicity: NACS's smaller, lighter design is genuinely better from a user experience perspective.
Industry momentum: Once Ford and GM announced adoption, the network effect made it difficult for other automakers to stay with CCS1.
Regulatory pressure: The US government's EV charging infrastructure funding programs began requiring NACS compatibility.
NACS vs CCS1 Infrastructure Impact
The shift to NACS creates a transition period where both CCS1 and NACS charging equipment coexist.
Tesla Superchargers: Tesla has been adding CCS1 adapters to Supercharger stations, allowing CCS1 vehicles to charge at Superchargers. As the fleet transitions to NACS, the need for CCS1 adapters will diminish.
Third-party charging networks (Electrify America, EVgo, ChargePoint): These networks are adding NACS connectors to their stations alongside CCS1. New stations are being built with both connector types.
Adapters: CCS1-to-NACS adapters allow current CCS1 vehicles to use NACS charging stations. NACS-to-CCS1 adapters allow NACS vehicles to use CCS1 stations.
New installations: For new charging station installations in North America, specifying both NACS and CCS1 connectors is the current best practice to serve the mixed fleet.
What About CCS2 (Europe and Australia)?
The NACS transition is primarily a North American story. In Europe and Australia, CCS2 (using a Type 2 AC connector base) remains the standard, and there is no equivalent shift to NACS underway. European automakers and charging networks continue to invest in CCS2 infrastructure.
China uses its own GB/T standard for both AC and DC charging, which is separate from both NACS and CCS.
Connector Manufacturing Implications
The NACS transition creates significant demand for new connector components:
Vehicle inlets: New EVs from 2025 onward require NACS inlets instead of CCS1 inlets. This is a major change for automotive connector suppliers.
Charging station connectors: Charging equipment manufacturers need NACS charging handles and cables alongside or replacing CCS1 components.
Adapters: The transition period creates demand for high-quality CCS1-to-NACS and NACS-to-CCS1 adapters.
Retrofit kits: Some charging station operators are retrofitting existing CCS1 stations with NACS connectors.
CZT's EV charging connector range includes connectors for CCS1, CCS2, and NACS applications, supporting both vehicle-side inlets and charging station-side handles.
Summary
The NACS vs CCS1 transition is effectively decided: NACS (SAE J3400) is the future standard for North American EV charging. The key points:
- NACS is smaller, simpler (3 pins vs 7), and lighter than CCS1
- Both standards support up to 500 kW DC fast charging
- SAE J3400 standardization in 2023 formalized NACS as an open standard
- All major North American automakers have committed to NACS for 2025+ vehicles
- CCS1 infrastructure will coexist with NACS for the next 5–10 years during fleet transition
- CCS2 remains the standard in Europe; GB/T in China
For charging infrastructure projects in North America, plan for both NACS and CCS1 connectors in the near term, with NACS as the primary standard for new installations targeting the 2025+ vehicle fleet.
NACS vs CCS1 FAQ
What is the difference between NACS and CCS1?
The core difference is physical and ecosystem-level. NACS uses a smaller unified interface for AC and DC charging, while CCS1 combines a J1772 AC connector with two added DC pins in a larger body. For buyers and charging operators, the bigger issue is transition timing: NACS is winning new North American vehicle programs, while CCS1 still matters because the installed base remains large.
Can a CCS1 vehicle use a NACS charger?
Yes, in many cases a CCS1 vehicle can charge from a NACS-enabled site by using an approved adapter and a charging network that supports that vehicle-to-charger combination. The practical constraint is not just the plug shape. Compatibility also depends on the vehicle software, charger configuration, and approved adapter path supported by the automaker or network operator.
Is NACS replacing CCS2 in Europe?
No. The NACS transition is mainly a North American standardization shift. Europe continues to center public charging on CCS2, and Australia follows the same general direction. If you are sourcing connector hardware for multinational EV programs, treat NACS vs CCS1 as a North American planning question, not a universal replacement for CCS2-based markets.
Should new charging stations install both NACS and CCS1?
For most North American rollouts today, dual-standard support is still the lowest-risk choice. NACS aligns with future vehicle adoption, but CCS1 is still needed to serve the existing non-Tesla fleet during the transition period. Unless the project serves a tightly controlled fleet, stations that support both standards usually protect utilization better and reduce near-term compatibility risk.
