Mains supply in Mexico: 127 V, 60 Hz, sockets of Types A and B. The grid in Mexico delivers 127 V. Dual-voltage gear copes; single-voltage 230 V devices do not. The grid runs at 60 Hz. Chargers do not care; mains-synchronised clocks and simple motors do.
Handy for multi-stop trips: El Salvador, Honduras, Canada and Cuba use the same plug types. Nearby but different: Guadeloupe, Grenada and Dominica – an adapter for Mexico will not fit there. Across North and Central America this setup is common: 24 of 31 countries.
Protective earth
Grounded and ungrounded sockets may occur
Mixed supply: Type A without earth, Type B with earth. Which one is in your room only shows on arrival.
Check the rating plate: 127 V suits “100–240 V” supplies, not single-voltage appliances. Frequency is 60 Hz; timers and simple motors run differently. Check your own device →
Types A and B – that is what you will find in Mexico (127 V, 60 Hz).
Do I need a voltage converter for Mexico?
Mexico supplies 127 V. Dual-voltage chargers are fine; 230 V-only appliances need a converter.
An adapter changes the plug shape only, not voltage or frequency. Mexico supplies 127 V at 60 Hz – check the rating plate on your device. How to read a rating plate →
If a socket gets hot, crackles or smells burnt, unplug the device straight away.