Travel plug adapters: which one to pack for each destination

Every traveller knows the moment: the hotel is lovely, the bed is good, and the phone charger won’t go into the wall. The reason is simple, and it has a date. Three things change from one country to the next: the shape of the plug, the voltage and the frequency. An adapter only fixes the first. For the other two, the label on your device is what counts.

Here is the rule that prevents most of the damage. If the charger says 100-240V, it works in any destination with the right adapter.

Why Brazil’s socket is different

Brazil used a mix of European two-pin and American flat-pin plugs until the 1990s. In 1998 the national standard NBR 14136 was adopted, revised in 2002. It is a non-compliant variant of an international design, IEC 60906-1 (type N). Wikipedia notes that use was optional for manufacturers from 2007 and became compulsory on 1 January 2010.

The plug comes in two versions: a 10 A one with 4.0 mm pins and a 20 A one with 4.8 mm pins. The 10 A plug fits a 20 A socket, but not the other way round, and that is deliberate.

Brazil’s grid has another quirk that matters more when you travel: it runs at 127 V in some regions and 220 V in others, with the same plug in both. It’s common to own appliances that work on one voltage only. That is why Brazilian travellers learn to read labels early. If you’re coming from elsewhere and heading to Brazil, the same advice applies in reverse: bring an adapter that fits type N, and check voltage on the label.

Plug shapes, demystified

The letter system comes from an international classification. The most common in tourist destinations:

A and B: parallel flat pins, with B adding a round earth pin. North America and Japan.
C: two round pins, the “Europlug”. Fits many European sockets.
E and F: round plugs with earthing. F is the Schuko, common in Germany and much of Europe.
G: three rectangular pins. Used in the United Kingdom, Ireland and the United Arab Emirates.
I: two flat pins in a V, with an earth pin on top. Australia and China (in newer sockets).
J: three round pins, typical of Switzerland.
L: three round pins in a row, common in Italy and Chile.
N: the type used in Brazil and South Africa.

The good news is that a decent universal adapter covers most of these shapes. The bad news is that it does nothing about voltage.

Table: socket, voltage and frequency for 24 destinations

The data below comes from Wikipedia’s list of mains electricity by country. Voltage is the nominal residential figure and may vary slightly. Check an official source before travelling if your device is sensitive.

Destination	Plug	Voltage	Frequency
Brazil	C, N	127/220 V	60 Hz
Portugal	C, E, F	230 V	50 Hz
Spain	C, F	230 V	50 Hz
Italy	C, F, L	230 V	50 Hz
France	C, E	230 V	50 Hz
Germany	C, F	230 V	50 Hz
United Kingdom	G	230 V	50 Hz
Ireland	G	230 V	50 Hz
Switzerland	C, J	230 V	50 Hz
Iceland	C, F	230 V	50 Hz
United States	A, B	120 V	60 Hz
Canada	A, B	120 V	60 Hz
Mexico	A, B	120/127 V	60 Hz
Argentina	C, I	220 V	50 Hz
Chile	C, F, L	220 V	50 Hz
Uruguay	C, F, I, L	230 V	50 Hz
Japan	A, B	100 V	50 or 60 Hz, depending on region
Thailand	A, B, C, O	230 V	50 Hz
Australia	I	230 V	50 Hz
China	A, I	220 V	50 Hz
India	C, D, M	230 V	50 Hz
South Africa	C, M, N	230 V	50 Hz
United Arab Emirates	G	230 V	50 Hz
Egypt	C, F	220 V	50 Hz

Two patterns jump out. The United States, Canada, Mexico and Japan sit in the 100 to 127 V band, while Europe, Asia and most of South America, including Argentina, Chile and Uruguay, run at 220 to 230 V and 50 Hz. Brazil sits in the middle: 60 Hz like its northern neighbours, but with 127 and 220 V grids.

An adapter is not a converter

This is the confusion that costs the most money, and it’s easy to settle.

An adapter changes only the plug shape. It doesn’t alter the electricity reaching the device. It’s a piece of plastic with pins.

A converter (or transformer) changes the voltage. It’s heavy, expensive and rarely needed for modern electronics.

The question that settles everything: what does the device label say?

INPUT: 100-240V (or 100-240V~ 50/60Hz). The device takes any voltage in the world. You only need the adapter. That covers most phone chargers, laptops, cameras and power banks.
A single voltage (for example 127V or 220V). Plugging it into a higher voltage than shown can destroy it. You need a converter, or, simpler, leave it at home.
No legible label. Don’t plug it in. Check the manual or the manufacturer’s site.

The classic culprits are heating appliances: hair dryers, straighteners, older razors, travel irons. They’re usually built for one voltage and draw a lot of power. The practical fix is to use the hotel’s equipment, which will almost always match the local standard.

Frequency (50 or 60 Hz) matters less for electronics with modern power supplies. It can affect old electric clocks and appliances with motors, such as some shavers.

How to choose an adapter

Not every adapter does everything. What to check when buying:

Coverage. Make sure it covers your destination’s shape. A “universal” adapter may lack type G or type L.
Earthing. For a laptop with a three-pin plug, the adapter needs the third contact. One with only two pins works for two-pin devices.
Current. Check the amp limit on the adapter. A 10 A one handles a phone charger, but not a hair dryer.
USB ports. Many models have USB ports built in, which saves carrying separate chargers.
Number of devices. For a trip with more than one person, an adapter with several ports saves a fight over the socket.

On a trip through more than one country, buy a universal adapter and a low-power extension strip. Then only one plug needs the adapter, and the strip feeds the rest.

Cases that need attention

United Kingdom and Ireland. Type G is big and has an internal fuse. A poor-quality adapter may not seat properly. Take one made for type G.

Italy and Switzerland. These are the European destinations where the “common European” adapter fails most, because of types L and J. A basic two-round-pin one fits, but doesn’t take three-pin plugs. If you’re eyeing Italy’s one-euro houses, check the socket type before bringing any electronics.

Japan. The voltage is 100 V, the only one on the list below 120 V. For devices marked 100-240V there’s no problem. Frequency changes by region, between 50 and 60 Hz, which only matters for older appliances. For the rest of the logistics there, see why Japan has almost no public bins.

United States and Canada. Plugs are type A and B. The 120 V is close to Brazil’s 127 V grid, but check the label.

Iceland. Two round pins, 230 V and 50 Hz, as in the rest of continental Europe. What’s different in Iceland is the clock: the country hasn’t changed its time since 1968.

Quick questions

Does a European adapter work in the UK?

No. The UK uses type G, with three rectangular pins, which doesn’t exist on the continent. You need a specific adapter or a universal one that covers G.

Can I use my phone charger in any country?

If the label says 100-240V, yes, with an adapter for the local shape. The great majority of modern phone and laptop chargers carry that marking.

Do I need a voltage converter?

On most trips, no. Only if a device takes a single voltage, like older hair dryers and straighteners. In that case it’s cheaper to leave it at home and use the hotel’s.

Why does the Brazilian socket have three pins?

Two pins are live and neutral and one is earth. Wikipedia points out, though, that few Brazilian homes had earthing when the standard was created, so a three-pin socket doesn’t guarantee the third pin is actually connected.

Before you close the suitcase

Check three things in this order: the destination’s plug shape, the label on each device and the adapter’s capacity. If everything says 100-240V, the trip stays light. If a single-voltage appliance turns up, leave it at home. And alongside the adapter, check the rest of your paperwork, like passport validity, which usually causes more headaches than the socket.

Sources

Wikipedia, Mains electricity by country. Plugs, voltage and frequency by country. Used as the basis for the table; check voltage with an official source if your device is sensitive.
Wikipedia, AC power plugs and sockets. Adoption of NBR 14136, the 10 A and 20 A versions and earthing in Brazilian homes.
IEC (International Electrotechnical Commission), World plugs. Official page on the world’s plug types. The IEC suggests checking details for each destination with your adapter’s manufacturer or a trusted source.