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What Size Breaker for a Tesla / EV Charger?

EV charger breakers are continuous-load circuits: size to 125 percent of charging current, then confirm the panel can absorb the load.
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Tesla / EV Charger
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standard
Deciding input
Nameplate current
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Compatibility calculator

What Decides the Breaker

EV charging is a continuous load, so the circuit is sized above the charging current.

InputSizing basisBreaker directionStatus
48 A example load60 A continuous-load sizing60 A starting pointRun conductor check
What Size Breaker for a Tesla / EV Charger?. Use the nameplate and calculator for the actual installation.

What Actually Decides the BreakerEV charging is treated as a continuous load. Branch-circuit overcurrent protection is sized at 125 percent of the maximum charging current setting. The EVSE instructions then lock the matching conductor size and breaker. Panel capacity is a separate Article 220 question.

Check breaker and wire together

48 A Charge Current on a 50 A Breaker Mistake

The job-site situation behind this search.

Wall-mounted EVSE set to 48 A continuous charge current needs a 60 A breaker because continuous loads are sized at 125 percent. Installers who match breaker amps to charge amps one-for-one undersize the circuit on day one.

The second failure mode is a correct branch circuit on a panel that cannot accept the new continuous load without a service or load-management fix.

Worked Starting Point

A concrete path for this appliance — not a shared checklist.

Worked Starting Point: 48 A EVSE on a 60 A Circuit

Tesla Wall Connector or similar EVSE, maximum charge current set to 48 A, continuous load, copper conductors, 75 C terminations, adequate panel capacity assumed.

  1. Continuous-load design current = 48 A × 1.25 = 60 A.
  2. Select a 60 A standard breaker.
  3. Select a conductor with usable ampacity of at least 60 A under install conditions — commonly 6 AWG copper under typical 75 C assumptions, subject to verification.
  4. Configure the EVSE to 48 A and document the circuit on the panel schedule.

Starting point: 60 A breaker for a 48 A continuous charge setting, plus a panel load check before the install is sold as complete.

Field Checks for This Appliance

Checks that matter specifically here — not the generic breaker list.

  • Apply 125 percent to the charge rate

    48 A continuous → 60 A breaker. 32 A continuous → 40 A breaker. Matching 48 A to a 50 A breaker fails the continuous-load step.

  • Set the EVSE dip switches / software to the circuit

    A Wall Connector must be configured to the installed breaker size. Leaving factory max current on a smaller circuit creates trips or unsafe reliance on the breaker.

  • Run a load calculation on the panel

    A perfect 60 A EV circuit still fails if the service or feeder cannot accept the continuous add.

  • Mind indoor vs outdoor terminations

    Garage ambient, conduit fill and long feeders can force conductor upsizing beyond the minimum table used in brochure PDFs.

Tesla / EV Charger Breaker FAQs

What size breaker for a Tesla Wall Connector?
Whatever matches 125 percent of the configured charge current, commonly 60 A for a 48 A setting. Smaller circuits are valid when the EVSE is configured down and the instructions allow it.
Why not use a 50 amp breaker for 48 amps?
Because continuous-load sizing requires the overcurrent device to be at least 125 percent of the continuous current. 48 × 1.25 = 60.
Do I need a load calculation to add an EV charger?
Yes if you care whether the panel and service can accept the continuous load. The branch-circuit math alone does not prove the service is adequate.