I opened up the condenser unit on my heat pump today, and found a 25amp contactor, what confuses me, is that there is a 40amp breaker, with #8 wire going to it. What confuses me, is shouldn't there be a 40amp contactor?

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2018 Subaru Crosstrek (Mine)
2019 Subaru Outback (Wife's)
1979 300CD (sold)