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Does the switch on a relay circuit have to have high contact values?
So I have a compressor and a battery in series, attached to a relay by 2 wires, which is then attached to a circuit containing a switch rated at 20amp /12 volt with another 2 wires. I have 3 questions:
1. Does the circuit which currently contains two prongs of a relay and a switch need a battery to work the relay circuit? in other words: what powers the electromagnet inside the relay?
2. Does the switch attached to the non-business side of the relay need to be rated for the 50amps and 14.1 volts the compressor will draw or not?
3. Where does the fuse go? What size fuse is needed for the small compressor that comes with dixie horns : http://www.swd-uk.net/ekmps/shops/swd123/images/525-ful1.jpg
But dude... I got them for road use. If an Ice Cream Van is allowed to play tunes then so am I
Yes, you need some power to energize the coil and make the contacts close.
2. No, read the specs on the relay, it will have a voltage and current specification for the coil, or perhaps voltage and resistance. Typical is 12 volts and 100 mA
3. put fuses where ever you think they may be needed. Pick a current 20 to 50% higher than the highest current seen in that wire.
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