Forty and forty-eight amps are not sizes a designer picks freely — they are circuit sizes.
Key Takeaways
- 40 A and 48 A are circuit classes: each is the continuous ceiling of its breaker size under the NEC 125% rule.
- Chargers cluster on the rungs because a rating between them would still need the larger circuit.
- Adjustable output exists so one charger can land on whichever rung a home offers — it never moves the rungs.
- Choosing between a 40 A and a 48 A charger is choosing the circuit first and the charger second.
Under the National Electrical Code, EV charging is a continuous load and the breaker is sized at 125% of the charger’s current, so a 40 A charger belongs to a 50 A circuit and a 48 A charger belongs to a 60 A circuit. Home chargers cluster on those rungs of the ladder, which means comparing the EV-ACT5006T with a 40 A charger is really comparing the two circuits behind them.
The Ladder Itself
| Charger output | Breaker (125%) | The rung, in practice | EVDANCE example |
|---|---|---|---|
| 32 A (about 7.7 kW) | 40 A | The largest continuous load a 40 A circuit feeds | EV-ACS3210T portable, 10–32 A |
| 40 A (9.6 kW) | 50 A | The NEMA 14-50 circuit class found in many garages | EV-ACS4005T; the ACT5006T in its plug-in configuration |
| 48 A (11.5 kW) | 60 A | The next standard residential circuit size up | The ACT5006T hard-wired |
Read the ladder from the wall outward. The circuit classes already exist in the panel — 40 A, 50 A, 60 A breakers are standard residential hardware — and each one has a fixed continuous ceiling under the 125% rule. Chargers are designed to those ceilings because a rating between rungs buys nothing: a hypothetical 44 A charger would still need the 60 A circuit; on a 50 A circuit it could not exceed 40 A anyway. The guide to how many amps an EV charger needs shows how a household’s driving lands on one rung or another.
Why Adjustability Exists: Landing on a Rung
If chargers were fixed at one rung, every home would need the charger built for its exact circuit. Adjustable output is the industry’s answer. The EV-ACS4005T offers 16–40 A in steps, so one portable unit can sit on a smaller circuit today and the 50 A rung tomorrow. The ACT5006T is set to its circuit at installation for the same reason: configured to 40 A it belongs to the 50 A class, configured to 48 A it belongs to the 60 A class. The breaker sizing guide covers how that pairing is chosen. What adjustability never does is move the rungs: the setting must land on the circuit that exists, as the hardwired vs plug-in comparison explains.
What One Rung Up Actually Buys
Kept short, because the ladder is the point: the 48 A rung delivers 11.5 kW against the 40 A rung’s 9.6 kW — about 20% more power, useful in short parked windows and with large batteries, invisible across a full night. Whether that step is worth paying for in your routine is a separate question, covered in our guide to whether a Level 2 charger is worth it and in the Level 2 power explainer. The ladder explains the menu; it does not order for you.
Two Chargers, Two Rungs
The EV-ACT5006T is unusual in spanning two rungs with one product: hard-wired on a 60 A circuit it is the 48 A class; through its NEMA 14-50P plug on a 50 A circuit it is a 40 A unit. The EV-ACS4005T lives on the 40 A rung and adjusts downward from it. So the familiar “40 A vs 48 A” shortlist is not really two rival chargers — it is one decision about which circuit your home will host, with the charger following. The full EVDANCE range is laid out along the same rungs.
Frequently Asked Questions
Is there a charger class between 40 A and 48 A?
No standard one. The next circuit class above 50 A is 60 A, whose continuous ceiling is 48 A. A rating in between would need that same 60 A circuit, so manufacturers build to the rungs instead.
Can a 40 A charger be turned up to 48 A later?
Only if two things change: the product must support the higher setting, and the circuit must be the 60 A class. On an existing 50 A circuit the setting stays at 40 A — raising it is an electrician’s circuit job, not a menu tweak.
Does the ladder change on a 208 V supply?
The rungs are current classes, so they stay put. What changes is power: at 208 V the same 48 A delivers about 10 kW instead of 11.5 kW. Amps decide the rung; volts decide what the rung delivers.
Related Reading
- How Many Amps Does an EV Charger Need?
- What Size Breaker Do I Need for an EV Charger?
- How Many kW Is a Level 2 Charger?
- EV Charger Hardwired vs Plug-In: Which Should You Choose?
