What Size Breaker for a Dryer?
- Appliance
- Dryer
- Scope
- nameplate
- Deciding input
- Nameplate current
- Next
- Compatibility calculator
What Decides the Breaker
Dryer circuits depend on the nameplate and installation instructions.
| Input | Sizing basis | Breaker direction | Status |
|---|---|---|---|
| 24 A example load | 24 A load | 25 A starting point | Run conductor check |
What Actually Decides the BreakerThe dryer nameplate current (or the manufacturer circuit size statement) sets the load. A 30 A breaker is common because many residential electric dryers sit near 20–24 A at 240 V, but a larger unit or a combination washer-dryer can push past that. The conductor must support the breaker under the termination and small-conductor rules — a 30 A breaker on 10 AWG copper is the usual pairing, not a free pass to ignore the nameplate.
The Swap That Gets Failed
The job-site situation behind this search.
A homeowner replaces a gas dryer with an electric unit, or swaps brands, and assumes the existing 30 A receptacle is fine. The inspector or the manufacturer instructions then force a larger conductor, a different receptacle configuration, or a dedicated circuit that was never there.
Search intent here is almost always residential electric dryer branch-circuit sizing. Gas dryers with a 120 V ignition or drum motor are a different question and should not inherit this page's starting point.
Worked Starting Point
A concrete path for this appliance — not a shared checklist.
Worked Starting Point: 24 A Nameplate Dryer
Residential electric dryer, nameplate 24 A at 240 V, nonmotor-only branch circuit, copper THHN, 75 C terminations, short run indoors.
- Treat 24 A as the design current from the nameplate.
- Select the next standard breaker that covers the load: 30 A is the common landing.
- Check conductor ampacity and small-conductor limits: 10 AWG copper is the usual companion for a 30 A dryer breaker under common conditions.
- Confirm the receptacle and cord configuration match the installation instructions before calling the circuit done.
Starting point: 30 A breaker on 10 AWG copper for this 24 A nameplate — then verify with the compatibility calculator if ambient, length or aluminum changes the picture.
Field Checks for This Appliance
Checks that matter specifically here — not the generic breaker list.
Read the dryer nameplate, not the carton
Use rated current or the stated minimum circuit ampacity. Marketing wattage on the front panel is not the branch-circuit design number.
Confirm 240 V, 3-wire or 4-wire
Modern dryer installations expect a 4-wire receptacle. An old 3-wire NEMA 10-30 feed is a change-of-equipment moment, not proof that 30 A is still correct.
Match breaker to conductor
A 30 A dryer breaker typically rides on 10 AWG copper. Upsizing the breaker without upsizing the wire fails the compatibility check.
Keep it dedicated
The dryer circuit is not a laundry multioutlet free-for-all. Shared laundry circuits are a different article problem and a common red-tag.