Circuit breaker sizing for aleph2

Hello

I am building aleph 2 with 1.2kVA tranny and plan to use circuit breaker instead of fuse at the transformer primary. The primary size will be 220V .

Can I use the 5A circuit breaker? Since, it is a bit smaller capacity than the transformer, but consider the aleph 2 design, the power consumption is just only 300W

Any suggestions?

Thank you