[jc2464]

Adding a belated data point, I likely have the same breaker (type BR?) used for the same purpose (EV at 16A, 240v). The temperatures are almost the same as yours with the test button side at 41C and cooler side at 32C. From what I could see, wires and bus are cooler, so it appears to be this breaker's design simply tends to heat up a bit internally! Anyway, thanks for this post, it and the responses are reassuring.