I have inherited an 80's vintage swimming pool. The pump is a 220v 1hp 0.75kW Hayward Superpump. I installed it new less than 5 years ago. It runs off a 30amp breaker. There are two lights, each: 110v, 500W, which also run off a (separate) 30amp breaker (there is also an outlet on the same circuit as the lights). What amperage switch is appropriate for these applications. I've tried 15 and 20 amp switches, and though it's no problem to change them out, I'm wondering why they keep failing.