The table below summarises the plug types, voltage and frequency of electrical current in both Dominican Republic and Costa Rica.
| Dominican Republic | Costa Rica | |
|---|---|---|
| Plug Types | A | A, B |
| Voltage | 110V | 120V |
| Frequency of electrical current | 60Hz | 60Hz |
Dominican Republic uses Plug Type A.
In Costa Rica there's more than one socket type in use.
You will need this adaptor:
Socket Type
(Dominican Republic) to Plug Type B
(Costa Rica)
Costa Rica also uses Socket Type A, which is used in Dominican Republic. If using an appliance that has a Type A Plug in the Type A Sockets of Costa Rica, you will not need an adaptor.
The voltages found in Dominican Republic (110V) and Costa Rica (120V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.
The frequency found in Dominican Republic and Costa Rica is exactly the same (60Hz). Timing devices and appliances that use motors will function as expected under this frequency.