What Size Circuit Breaker Does a Dryer Need?
Getting the circuit breaker size wrong on a dryer is a common and potentially dangerous mistake. Go too small and the breaker trips constantly. Go too large and the wiring isn't protected if something goes wrong.
Here's exactly what you need.
Electric dryer circuit breaker size
Standard electric dryer: 30A double-pole circuit breaker, 240V dedicated circuit, 10 AWG wire
This is the standard for virtually every residential electric dryer on the market. The nameplate on your dryer will confirm the exact requirement, but 30A/240V is correct for almost all of them.
What "double-pole" means: A double-pole breaker takes up two slots in your panel and connects to both legs of your 120V service to deliver 240V. Electric dryers need 240V to power the heating element.
What "dedicated circuit" means: The dryer must be the only appliance on that circuit. No other outlets or fixtures share the 30A circuit.
Browse 30A double-pole circuit breakers (/collections/2-pole) — we stock direct-fit replacements for all major panel brands.
Gas dryer circuit breaker size
Standard gas dryer: 20A single-pole circuit breaker, 120V
A gas dryer uses gas for heat — electricity only powers the motor, controls, and igniter. That's a much smaller electrical load, so a standard 20A single-pole (120V) circuit is all it needs. Most gas dryers plug into a
standard 3-prong outlet.
How to tell if you have a 240V or 120V dryer outlet
Look at the outlet:
- 4-prong outlet (NEMA 14-30): Modern 240V dryer outlet — electric dryer
- 3-prong outlet (NEMA 10-30): Older 240V dryer outlet — electric dryer
- Standard 3-prong outlet (NEMA 5-20): 120V outlet — gas dryer
Look at the breaker in your panel:
- Single breaker in one slot: 120V (gas dryer circuit)
- Two breakers tied together occupying two slots: 240V (electric dryer circuit)
Can I use a bigger breaker for a dryer?
No. It might seem logical to install a 40A or 50A breaker to "give it room to run" — but this is dangerous. The breaker protects the wiring, not the appliance. A 30A dryer circuit is wired with 10 AWG wire, which is
only rated to carry 30A safely. If you install a 40A breaker, the wire can overheat and start a fire before the breaker trips.
The dryer's nameplate specifies a maximum circuit size. Never exceed it.
Upgrading from gas to electric dryer
If you're switching from gas to electric, you'll need:
1. A new 30A 240V dedicated circuit run from the panel to the dryer location
2. A 30A double-pole circuit breaker in the panel
3. A 4-prong outlet (NEMA 14-30) installed at the dryer location
This is a job for a licensed electrician — running new wiring from the panel is not a typical DIY task.
Replacing a dryer circuit breaker
If your existing electric dryer circuit breaker is tripping frequently or is old and worn, it may need replacement. The replacement breaker must match:
- Brand — Siemens, Eaton, Square D, ABB (brand-specific, not interchangeable)
- Amperage — 30A
- Type — double-pole
Browse replacement dryer circuit breakers (/collections/2-pole) — we stock direct-fit 30A double-pole breakers for all major panel brands.
Photo of "Siemens, Q120DF, 20A, Circuit Breaker"
FAQ
What happens if I use a 20A breaker on a dryer circuit?
The dryer will draw more current than the breaker's rating when the heating element runs, causing the breaker to trip repeatedly. A 30A dryer on a 20A circuit will never run a full cycle without interruption.
My dryer circuit breaker keeps tripping — do I need a bigger one?
No. Upsizing the breaker on an existing circuit is dangerous if the wiring isn't rated for the higher amperage. The tripping usually means the breaker has worn out and needs to be replaced with an identical 30A
double-pole unit. See our guide on why circuit breakers keep tripping (/blogs/news/circuit-breaker-keeps-tripping) to rule out other causes first.
Do I need a GFCI breaker for my dryer?
No. Dryers are not required to be GFCI protected under current NEC code. A standard 30A double-pole breaker is correct.
What size wire goes with a 30A dryer breaker?
10 AWG copper wire. Never use 12 AWG wire on a 30A circuit — 12 AWG is only rated for 20A. If you're running new wiring for a dryer circuit, 10 AWG is required.