For a 30-amp dryer, you would typically need a circuit breaker that can handle the same amperage. In most cases, a 30-amp circuit breaker would be suitable. However, it's important to note that electrical code requirements and specific circumstances can vary, so it's always a good idea to consult a licensed electrician or refer to your local electrical code for precise guidance. They will be able to assess your specific situation and provide the most accurate recommendation.