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Relay Question

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sg101

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Hi, I always wondered what "30/40" A meant on a 12V relay. What is the slash (/) between 30 and 40? Does that mean? I know it means the current rating, but does it mean a range of amperage it can handle? I have a relay that says 12V 30/40A. It is a single pole double throw relay. Thanks!
 
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