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Relay question




What is the difference between a relay, a contactor, and a motor starting 
relay?  I ask this because I was ready to buy a motor starting relay that 
I thought would have worked just fine for my Tesla coil control 
cabinet (proper voltage and current ratings), but the person who was 
selling it said that it would not be possible to use it as a simple high 
current relay, and that I really needed a regular relay.