I must have missed somehow whether this is for AC or DC
No matter what, you can think of a switch as a bartender. The load being an obnoxious drunk.
The bartender calls over to the bouncer (relay)...
"Take care of this will ya"
The switch did not have to work very hard, did it?
After fighting bargain DC relays for too many years, never again will I buy anything other than a TYCO which is the new name for the BOSCH 30-amp DC relay. The dollar ninety-nine relays which look like a TYCO are junk. The TYCO relay is made better, out of heavier duty components, is environmentally sealed, and does not get as hot as it's competitive garbage. Get This: Bargain relays in a bone-dry desert environment. 10-months after purchase. Failed to operate cooling fan on radiator. Opened them up to find a mound of rust inside. No possible way they got wet. Some form of weird electrolysis. So I TESTED f-o-u-r UNUSED different manufacture "Bosch Type" relays for power contact volt drop. Har Har Har Har! At thirty amps load it was a cruel joke. The worst was 2.15 volts drop. The "best" of the counterfeits was .88 volt drop.
