[FrankJ]

Realize ratings have a lot of assumptions built in. Sustained use and long term durability act as derating factors. The difference between the 30 & 45 amp connectors are more about the wire gauge the anything else. I would use the connector that gives the best crimp for the wire you are using without trimming strands to make it fit. I suspect this logic is why we use a 50 amp power pole for the battery which pulling way more than 50 amps at times.