NACS (North American Charging Standard)
Also known as: NACS, SAE J3400, Tesla connector, J3400
NACS, the North American Charging Standard, is the electric vehicle charging connector originally designed by Tesla and now standardized as SAE J3400.
It's smaller and lighter than the competing CCS1 plug and handles both home and fast charging in one connector. While CCS1 was the official standard for years, most major automakers switched to NACS after 2023, mainly to gain access to Tesla's large, reliable Supercharger network.
NACS (North American Charging Standard), explained at three levels
At home
Think of how phones moved from a mess of chargers to one USB-C plug. North American electric cars are going through the same change. NACS is a charging plug Tesla designed, and most automakers now build cars around it. One compact connector handles both slow charging at home and fast charging on the highway through the same pins, so drivers can use more stations with less hassle.
At work
NACS, standardized as SAE J3400, is the EV charging connector Tesla designed and opened to other automakers in 2022. Most automakers selling EVs in North America have adopted it, mainly for access to Tesla's Supercharger network. For businesses and fleets installing chargers, it is becoming the default plug, while adapters and dual-cable chargers bridge the transition from the older CCS1 standard.
At home
A NACS plug has five pins: two large ones carry power, one is ground, and two small ones handle signalling between car and charger. The same two power pins carry AC at home and high-power DC at a fast charger, which keeps the plug small. CCS1 instead adds two extra DC pins below a J1772 plug. With an approved adapter, many CCS1 cars can now use Tesla Superchargers, while newer models have NACS ports built in.
At work
Fast charging is a conversation as well as a power connection. When a car plugs in, it and the charger exchange messages over the control pilot pin using power-line communication, agreeing on voltage, current, and, with Plug and Charge, payment identity under ISO 15118. NACS uses the same communication protocols as CCS1, which is why adapters work. Many networks install dual-cable chargers during the transition, and fleet planners weigh model years, adapter policies, and connector reliability.
At home
The plug shape matters less than the system behind it. Tesla's Superchargers succeeded because the car, charger, and payment were designed together: you plug in, the car identifies itself, and charging starts. Other networks relied on separate apps and card readers and suffered more broken stations. While NACS fixes the physical mismatch, in my view Tesla's real advantage was always network reliability and uptime, not the connector itself.
At work
The transition creates engineering and procurement issues. Adapters must be certified for safety, and UL 2252 now covers them. Cable reach is a problem when a car's port isn't positioned for Supercharger stalls designed around Tesla's rear-corner ports. Car-to-charger communication must work across both connector types, and some public charging grants, such as the US NEVI program, specify connector requirements. Track updates to SAE J3400 and regional procurement rules.
Real-world examples
At home
Aisha bought a used electric SUV with a CCS1 port in Saskatoon. After her automaker approved Supercharger access, she bought an NACS adapter and could use Tesla stations on her road trip to Banff.
At work
Fatima manages a delivery fleet electrification project in Quebec. Knowing future vans would come with NACS ports, her team installed dual-connector depot chargers to support both current and future vehicles.
How it compares
| feature | NACS (North American Charging Standard) | CCS1 |
|---|---|---|
| Origin | Tesla, now SAE J3400 | Industry standard via SAE J1772 combo |
| Connector size | Smaller and lighter | Larger and heavier |
| Home and fast charging | Same connector | Same inlet, separate pin groups |
| Automaker direction | Most are adopting it | Being phased out in new models |
NACS is becoming North America's default EV plug, much like USB-C for phones.
For analysts
If your organization is installing chargers now, I'd plan for both plugs during the transition. Dual-connector equipment costs a little more, but it avoids stranding assets as the vehicle fleet switches to NACS.
History & origin
Tesla introduced its proprietary connector in 2012 with the Model S and built the Supercharger network around it. Other North American automakers adopted the Combined Charging System (CCS1), and for years drivers dealt with two incompatible plugs. In November 2022, Tesla published its connector design and called it the North American Charging Standard. Ford announced in May 2023 that its EVs would adopt it, and GM, Rivian, Hyundai, Kia, Mercedes-Benz, Nissan, and many others followed within months. SAE International standardized the connector as J3400, and new models with built-in NACS ports began arriving in 2025. In my opinion, the switch to NACS was a rare case of an industry abandoning a committee standard because customers voted with their charging experience.