Buy the Lectron if the adapter lives in the car and gets used occasionally. Buy the A2Z Stellar Plug if it lives on a wall outdoors, stays mated to a Tesla Wall Connector for years, or if you simply want the most certified part in the category. Both do the same job - they let a car with a J1772 inlet charge from a Tesla-style NACS AC connector - and both are listed to UL 2252, which is the standard that matters for an EV coupler adapter. The A2Z costs more and buys you a locking mechanism, a higher published current rating and an IP67 claim. For a lot of owners the Lectron is enough, and we would rather say that than sell up.
What these adapters are for, in one paragraph
AC only. A NACS-to-J1772 adapter is a passive piece of metal and plastic that changes the shape of a connector - it does nothing electrical. It lets you charge from a Tesla Wall Connector, Destination Charger or Mobile Connector, and it does notwork at a Supercharger; Lectron prints that warning on its own product page. Supercharging a non-Tesla needs an active DC adapter from your car's manufacturer, which is a different and much more expensive part - see do NACS adapters work at Superchargers.
Side by side
| Lectron NACS to J1772 | A2Z EV Stellar Plug |
|---|
| Direction | NACS source to J1772 car | NACS source to J1772 car |
| Rating as listed | 48A / 240V on the listing we link | 80A / 19.2 kW |
| Certification | UL 2252 | UL 2252 and CSA |
| Ingress rating | Published inconsistently - see below | IP67 |
| Retention | Friction fit | Locks in |
| Works at a Supercharger | No | No |
| Best use | In the car, occasional use | Left on a wall unit, outdoors |
Three things that actually differ
1. The current rating, and the catch in it
A2Z publishes 80 amps and 19.2 kW. The Lectron listing we link publishes 48 amps at 240 volts - and here is the part worth knowing before you shop: Lectron sells more than one NACS-to-J1772 adapter, and its own site publishes an 80-amp, 19.2 kW model with a 5 AWG cable alongside it. Two parts, two ratings, similar names. Read the listing you are actually buying rather than a review of "the Lectron adapter".
That said, for home charging the rating is mostly headroom. A home Wall Connector tops out at 48 amps and almost no car accepts more than that on AC, so a 48-amp adapter is not the bottleneck in a driveway. The 80-amp parts earn their rating at commercial and 19.2 kW installs, which our 80-amp charger page covers.
2. The locking pin
The A2Z locks into the J1772 inlet. That matters more than it sounds. An adapter left mated to a wall unit is a $50-plus part sitting in a driveway, and a locking interface also keeps the connection mechanically tight over hundreds of cycles, which is where heat comes from in a connector. If the adapter stays in the car and only comes out on trips, the friction fit is fine.
3. The IP numbers, which are less impressive than they look
Read this part before you trust any adapter's weather rating. An IP number for a connector is normally quoted unmated - the sealed part, by itself. Volex publishes both figures for its comparable adapter: IP67 unmated, IP54 when it is mated to a plug or socket. Mated is how yours will live. Lectron, for its part, publishes an IP67 figure in the product description and an IP54 figure in the FAQ on the same page, which is the kind of inconsistency we are not going to resolve in the flattering direction. Treat every adapter as splash-resistant rather than weatherproof, point the connector down, and do not leave one lying in a puddle.
Which to buy
- Occasional use, lives in the frunk: Lectron. It is listed, it is cheaper, and 48 amps is not a real ceiling at home.
- Daily use on a home Wall Connector, outdoors: A2Z. The lock and the higher rating are worth it when the part never comes off.
- Tightest budget, still want a listing: the FOCSPROD 60-amp unit, also UL 2252, which is why it is on this page.
- You need two: buy a listed one for the wall and a cheap listed one for the glovebox. Do not buy an unlisted adapter to save ten dollars - this is the one part of your charging setup that carries full current through a hand-made connection.
The full field, including the picks we rank below these two, is on best NACS to J1772 adapters. If your car has a NACS port and you need the opposite part, that is J1772 to NACS.
