Voltage, Plugs and Power Outlets in Brasil

The first night in a new apartment, most people find out the same thing: their charger does not fit the wall. Brasil uses its own plug and socket standard, and voltage is something to check rather than assume. Here is what to know before you plug anything in.

The socket

Inmetro, the national standards and metrology institute, explains the standard in plain terms:

• There is one socket pattern, always with three holes, set in a recessed hexagonal shape.
• There are two plug patterns: one with two round pins and one with three round pins.
• Pins come in two diameters, 4 mm and 4.8 mm. Higher-power appliances use the thicker pins.
• The flat pin, as found on US plugs, is no longer part of the standard.

So a two-pin round plug fits a three-hole socket, and US flat-pin plugs do not fit at all without an adapter. You will still see older sockets in some buildings. A small adapter solves most of it.

Voltage: check, do not assume

Voltage is the part that can damage a device. US devices are built for the US supply. In Brasil, the voltage is not the same in every city, and sometimes not in every outlet of the same building. Check the official page and, more practically, ask the building manager or landlord, look for a label by the outlet, or ask the local electricity distributor.

Then look at your own device:

• Most phone and laptop chargers are marked with a wide input range, for example 100 to 240 volts. Those only need a plug adapter.
• Hair dryers, straighteners, kettles, blenders and other heating or motor appliances are often built for a single voltage. Plugged into the wrong one, they can fail or overheat.

Read the label on the charger or the appliance. If it lists a single voltage that does not match the outlet, you need a transformer, or a local appliance.

Adapters and transformers

• Plug adapters only change the shape of the plug. They do nothing to the voltage. Buy a few; they are cheap and easy to find in hardware and electronics shops.
• Transformers change the voltage. They are heavy, must be rated above the power of the appliance, and are worth it only for something expensive or hard to replace.
• Buying local is often simpler for kitchen appliances and hair tools. Many local appliances are sold in versions for each voltage, so check the box before you buy.

Power strips and surges

A power strip with surge protection is worth having for a laptop and monitor. Choose one sold locally with the Brazilian socket pattern, so your adapters plug into it rather than the wall. Avoid chaining adapters into adapters.

A few habits

• Label your chargers with the voltage range so you do not have to read tiny print each time.
• Keep one adapter in your day bag.
• When you move into a new place, ask about voltage the same day you ask about the wifi.

Checklist

1. Check the input range printed on every charger you bring.
2. Pack two or three plug adapters, or buy them on arrival.
3. Leave single-voltage heating appliances at home, or plan for a transformer.
4. Ask your building or landlord about the voltage of each outlet.
5. Use a surge-protected strip for your work setup.

Common questions

Will my laptop work? If the charger says 100 to 240 volts, it will work with a plug adapter.

Can I use a US power strip with an adapter? It will work with dual-voltage chargers only. It does not convert voltage for anything plugged into it.

Mistakes to avoid

• Assuming every outlet in an apartment is the same. Ask, and look for labels.
• Trusting a plug adapter to protect an appliance. It only changes the shape of the plug.
• Plugging a single-voltage hair dryer into an unknown outlet. Check the label on the dryer first.
• Forcing a plug. If it does not fit easily, use the right adapter. Forcing pins into a socket damages both.
• Chaining adapters. One adapter into one socket. If you need several, use a local power strip.