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So how safe is this? Should i fuse between relay and surge protector? Its a Arduino controlled smart controller i made. The relays turn on based on inputs from the Arduino which has sensors. IE: Temp gets low, heater kicks on. Ect.

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So how safe is this? Should i fuse between relay and surge protector? Its a Arduino controlled smart controller i made. The relays turn on based on inputs from the Arduino which has sensors. IE: Temp gets low, heater kicks on. Ect.	4