a fuse won't save you from electricution...the body only draws milliamps before you die. You need a GFCI for that. If everything is on a properly sized breaker the system would be protected from shorts and overloads, however if you want to add fusing, try this:
2A slow blow fuse for the pump (so it won't open when the motor starts)
.25 fast acting fuse on the PID (or whatever the required current rating is...check that)
Nothing needed on the SSR...the breaker will take care of that.
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