what kind of relay is normally open but will close when triggered? - diyAudio
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Old 20th August 2006, 01:30 PM   #1
jarthel is offline jarthel  Australia
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Default what kind of relay is normally open but will close when triggered?

would it be dpno? thank you.
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Old 20th August 2006, 01:38 PM   #2
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Most relays are NO (Normally opened). So you need a double pole? Sometimes they come as DPDT double pole, double throw. If you get DPDT, you can choose to connect to the NC (normally closed) of the NO (normally open) contacts. The other contacts will be the common connection. Here's a typical datasheet <http://pewa.panasonic.com/pcsd/produ...pdf_cat/hc.pdf>
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Old 21st August 2006, 11:31 PM   #3
jarthel is offline jarthel  Australia
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thanks for the help
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Old 22nd August 2006, 08:17 AM   #4
AndrewT is online now AndrewT  Scotland
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Hi,
do you need double pole or would single pole do?
SPST are usually NO. and due to the single contatc are often rated at higher currents
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