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ecoandy asked How does one choose a relay?
I need relay that will be switched by a 5 VDC signal that will turn power off and on to a 120 VAC 10Amp heater. How do I choose this?
And got the following answer:
If the 5VDC signal is from a microprocessor or logic chip it might not have enough current driving capacity to power a relay that can handle 10Amps. You need to know what the current driving capacity of the 5VDC signal is. Find a website that sells relays and find one with a 5VDC coil and 10Amp contacts. Then check the data sheet for the current draw of the coil. If your 5VDC signal is too weak then you have a few options; >Use a small 5VDC relay to drive a larger relay that can handle the 10Amps >Make a transistor circuit to power the relay from the 5VDC circuit. You can find plenty of transistor circuits on the web to interface 5VDC to 12VDC. Use the 12VDC to power a 12VDC relay which will be easier to find anyway.
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