Ideally the breaker and cable should be rated for 25% more than max continuous so 62.5A is min really.
Beware. Many of the cheap no name breakers available on ebay / Amazon / direct Chinese web sites break at well below the rated capacity. Many Youtube videos on this and many people on here have had trouble. Reputable brands such as Blue Sea should be OK. Personally, everything on my DC system on my boat uses fuses.
Avoid the cheap unbranded ones like this.
