Pond Boss Forums GENERAL QUESTIONS Pond Boss Creative engineering

It takes a certain (low) voltage (and so many small amps) to throw the relay, but the switch that is closed can handle a different, usually heavier load (higher voltage and/or current).

It's analogous to a simple light switch in your house. Closing the switch requires a flick of your finger. Once closed, the switch can handle 110 VAC at 10 or 15 A - something the activating device (your finger) can't handle.