Can I replace a 30 amp breaker with a 40 amp breaker?

Asked By: Imane Yonis | Last Updated: 28th May, 2020
Category: home and garden home appliances
4.4/5 (3,672 Views . 33 Votes)
That 30A breaker protects you from excess current flowing through the system. Installing a 40A breaker raises the ceiling on the allowed current. You just swap out a 30A breaker with a 40A breaker. You're allowing the electrical system (not just the breaker) to run at 33% over it's rated capacity.

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Then, can I replace a 20 amp breaker with a 40 amp breaker?

Different question and the answer is "It depends". But in general the answer is "No, do not go and put a 30 amp breaker in place of a 20 amp breaker because the wiring is most likely 'sized' for the 20 amp load and -may- overheat if a 30 amp load is used with wiring sized for a 20 amp load."

Secondly, how many amps can you put on a 30 amp breaker? A 30-amp outlet supplies 3,600 watts (30 amps multiplied by 120 volts). Therefore, the breaker on that outlet could meet code and still trip anywhere between a total load of 2,880 watts (80 percent of 3,600 watts) and 4,320 watts (120 percent of 3,600 watts).

Consequently, can I replace a 30 amp breaker with a 50 amp breaker?

30 amp circuits use a 10 gauge wire, while 50 amp circuits require larger 8 gauge wire. Consult with your local building department or a licensed electrical contractor before making the change. Better to be safe than sorry, a overload on a circuit that powerful can cause a major fire.

Can I use a higher amp circuit breaker?

No! The only safe way to increase the circuit's capacity is by replacing the wire with one of adequate gauge. For 20 amps, 12 AWG copper is adequate for up to about 100 feet. If you simply replace the breaker, the wire can overheat and ignite the building from inside the walls.

39 Related Question Answers Found

What size wire do I need for 30 amps?

Any circuit fused for 30 amps must use a minimum of 10 ga copper or 8 ga alu. Longer runs may require an upgrade of wire size. In your case, use at least 10 copper for your welder regardless how far it is from the breaker panel.

What are 30 amp breakers used for?

Double-pole breaker
The 15-amp and 20-amp breakers often handle baseboard heaters, 30-amp serve water heaters and electric dryers, 40- and 50-amp are for electric ranges, and the 70-amp could serve a large air conditioner or a subpanel.

What can you run on 30 amps?

In a typical RV with a 30 amp electrical service some of the power hungry appliances and portable devices are the air conditioner, electric water heater, microwave, coffee maker, electric skillet, hair dryer, space heaters and a toaster.

Can I use 12 gauge wire on a 25 amp breaker?

A 12 gauge wire is rated for 25 amps. NEC only allows for it to be protected at a max of 20 amps (unless following an exception for motor loads).

How many outlets can be on a 15 amp breaker?


for a 15 amp circuit this allowed for 10 outlets and on a 20 amp circuit 13 outlets were allowed.

Can you change a 10 amp breaker to 20 amps?

The answer is yes. If the wiring is rated for the higher amperage then you can substitute the higher amperage circuit breaker. (This is true as long as you follow other rules, such as matching the breaker to the equipment and to the receptacle(s). By the way, this has nothing to do with the distance.

Why does my welder keeps tripping the breaker?

If your welder is functioning fine but is tripping the breaker quickly you can try replacing the breaker itself to see if it will work better. If your welder trips the breaker as soon as you plug it in try plugging another known-good item into that same outlet and see if it does the same. If not it may be your welder.

What is the difference between 20 amp and 30 amp?

Re: 20amp versus 30amp
A 20A outlet is what you have in your house, while a 30A outlet is larger. If you need an adapter to use a 20A household outlet, then your trailer is wired for 30A. You can use any campground 30A outlet, or 20A with the adapter.

Can 10 AWG handle 50 amps?

When a 10-gauge wire on a 50-amp breaker is OK.

Can you change a 30 amp to 50 amp?


Yes it can be converted from 30 amp to 50 amp service. It would be a process of changing the distribution panel or adding a second distribution panel to the travel trailer. If you do have 30 amp service, and you use an adaptor to plug in to 50 amp service, it will not improve anything.

Can you replace a 40 amp breaker with a 50 amp breaker?

Nearly all residential ranges require only a 40 amp circuit. 40 and 50 amp breaker/circuit are basically interchangable. You can use either for a 50 amp receptacle.

Is a double pole 30 amp breaker 60 amps?

A main breaker is a large-amperage double breaker, same as any double breaker in the breaker box, except it supplies power to each busbar. So your question is like asking if you can draw 60 amps off a 30 amp double breaker the answer is NO.

Can I replace a 30 amp breaker with a 60 amp breaker?

You need at least #6 wire for a 60 amp breaker. I think the OP is thinking of "doubling" the capacity of the single 30 amp breaker. We'll see when he returns with pictures. The answer is no.

How many amps can #10 wire handle?

Size & AMP Ratings
NM, TW, & UF WIRE (Copper Conductor) SE CABLE (Copper Conductor)
12 AWG - 20 AMPS 6 AWG - 65 AMPS
10 AWG - 30 AMPS 4 AWG - 85 AMPS
8 AWG - 40 AMPS 2 AWG - 115 AMPS
6 AWG - 55 AMPS 1 AWG - 130 AMPS

Can you replace a 15 amp breaker with a 30 amp breaker?


Typically the maximum breaker size for 12 guage wire is 20 amps; for 14 gauge wire is 15 amps, etc. A 30 amp breaker is too large for 12 gauge wire and would be unsafe. It is possible, of course, that the original breaker went bad and someone replaced it with a 15 amp one.

How can I increase the amperage in my house?

Increase the amps in your breaker box by changing the circuit breaker box.
  1. Consult with a qualified electrician before increasing the size of a circuit breaker.
  2. Turn off the power to the circuit breaker box at the disconnect box.

How big of a breaker do I need for a stove?

The suggested circuit breaker size for the kitchen stove is 50 amps, 220 volts. This is a double breaker. Single breakers normally carry 110 volts. It must be a dedicated circuit for the stove only, meaning that no other appliances or outlets can be served by that circuit.