What Circuit Breaker Do I Need for an EV Charger?
Electric vehicle charger installations are one of the fastest-growing electrical projects in residential and commercial buildings. Getting the right circuit breaker is critical — too small and the charger won't deliver full power, too large and the wiring is unprotected. Here is exactly what you need.
Level 1 vs Level 2 Chargers
Level 1 chargers plug into a standard 120V outlet and add about 4–5 miles of range per hour. They use the existing circuit and require no new breaker.
Level 2 chargers use 240V and add 20–30 miles of range per hour. They require a dedicated 240V circuit with a new 2-pole breaker. This is what most homeowners install.
What Size Breaker for a Level 2 EV Charger?
The breaker size depends on the charger's amperage rating:
16-amp charger (3.8kW) → 20-amp, 2-pole breaker, 12 AWG wire 24-amp charger (5.8kW) → 30-amp, 2-pole breaker, 10 AWG wire 32-amp charger (7.7kW) → 40-amp, 2-pole breaker, 8 AWG wire 40-amp charger (9.6kW) → 50-amp, 2-pole breaker, 6 AWG wire 48-amp charger (11.5kW) → 60-amp, 2-pole breaker, 6 AWG wire
The NEC 80% rule: the charger's continuous draw must not exceed 80% of the breaker rating. A 48-amp charger requires a 60-amp breaker (48 ÷ 0.8 = 60).
Common EV Charger Breaker Requirements
Tesla Wall Connector (48A): 60-amp, 2-pole breaker Tesla Wall Connector (32A): 40-amp, 2-pole breaker ChargePoint Home Flex (50A): 60-amp, 2-pole breaker JuiceBox 40 (40A): 50-amp, 2-pole breaker JuiceBox 48 (48A): 60-amp, 2-pole breaker Grizzl-E (40A): 50-amp, 2-pole breaker
Always verify with the charger's installation manual — manufacturers specify the required breaker size.
GFCI Requirements for EV Chargers
The 2020 NEC requires GFCI protection for EV charger circuits in garages and outdoors. Most modern Level 2 chargers have built-in GFCI protection, which satisfies this requirement. If your charger does not have built-in GFCI, you need a GFCI breaker.
Check your charger's documentation — it will state whether it has integrated GFCI protection.
Panel Capacity
Before installing an EV charger, verify your panel has capacity for the additional load. A 200-amp panel with a nearly full load may not support a 60-amp EV charger without a panel upgrade. Have an electrician perform a load calculation.
Related Circuit Breaker Resources
- What Size Circuit Breaker Do I Need?
- GFCI vs AFCI Breakers — What's the Difference?
- How to Find the Right Replacement Circuit Breaker
Need a 2-pole breaker for your EV charger? The AllBreakerSales.com catalog includes 40A, 50A, and 60A 2-pole breakers in all brands. Request a written quote to confirm the required catalog number and current availability. Call (951) 903-9804.