It looks like the 5 volt DC coil is connected between pins 3 and 5.
When unpowered, there should be a (normally) closed contact between pins 4 and 2.
When 5 volts is connected to the coil, there should be a contact closure between pins 4 and 1.
Check the resistance between pins 3 and 5, to see if it is a reasonable resistance for a 5 volt coil. I would expect a resistance between 25 and 100 ohms.
What you have is a single pole double throw (SPDT) relay. The coil is rated for 5 VDC, and the contacts are rated for up to 10A at 250VAC.
NO and NC are, as you surmised, normally open and normally closed. Pins 3 and
5 would be the relay coil. Pin 4 (COM) is the common terminal, connected (internally) to pin 2 (NC) when the relay coil is not powered, and to pin 1 (NO) when the coil is powered.
Specifically:
- no current across pins 3 & 5: pin 4 is connected to pin 2, and not to pin 1
- 5VDC across pins 3 & 5: pin 4 is connected to pin 1, and not to pin 2
Whether this is something you can use, depends on what your application for it might be.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It\'s time to throw all their damned tea in the harbor again.
I agree. I would not use this relay to switch line voltage, unless the 5 volt supply was completely and safely isolated from any chance of being touched, and was referenced to the voltage applied to the common.
That's correct. Of course, a double-throw relay can be used in place of either a single-throw NO or a single-throw NC -- you just leave the other terminal open.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It\'s time to throw all their damned tea in the harbor again.
You cannot generally switch a relay from a logic circuit, logic circuit will not provide enough mA, you will need a transistor between the output and the relay
You have a point, I was thinking logic gates not MPU, just thought it worth mentioning, as the original poster didn't know how to wire a relay, i suspect not using a MPU. Of course I could be wrong, I usually am ;-)
I am the OP :) I started playing with electronics a few months ago, so even after a lot of reading, its still pretty basic.
I am using the picaxe, not a "real" pic but a lot faster to code on (mostly because I dont know c, cpp or assembly).
but yes its worth mentioning, I already killed one of their medium range chips, not sure how, but resistors and making sure not to draw much more than a relay, transistor or led from the pins could be a start :)
The Finder website isn't working so trying to get data is hopeless. Nevertheless, The Relays-R-Us website in the UK does have some info on the 36 series
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