What Size Breaker Do You Need for a 48 Amp EV Charger?
The short answer is 60 amps — here's why the 125% rule exists and what wire size typically goes with it.
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Key takeaways
- 48A charger → 60A double-pole breaker.
- 40A charger → 50A breaker; 32A charger → 40A breaker.
- Wire gauge depends on wire type, length and local code — let an electrician size it.
The 125% continuous-load rule
The National Electrical Code treats EV charging as a continuous load, meaning the circuit's overcurrent protection must be at least 125% of the charger's rated current. 48 × 1.25 = 60, so a 48A charger needs a 60A breaker.
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Common pairings
16A → 20A breaker, 24A → 30A, 32A → 40A, 40A → 50A, 48A → 60A. Many chargers let the installer set a lower current to match an existing circuit.
Wire sizing
Copper conductors for a 60A circuit are commonly 6 AWG, but the correct size depends on insulation type, run length, conduit fill and local amendments. This is a job for a licensed electrician.
Safety note: This article is general information, not professional electrical advice. Working with 240V circuits can cause serious injury or fire. Hire a licensed electrician and follow local codes and permit requirements.
Sources & further reading
Written by
LarryLeoLarryLeo started EV Charging while researching his own next car purchase. He digs into the pros, cons and real cost savings of going electric — using government, standards-body and manufacturer sources — and shares what he finds so other buyers can decide with confidence.
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