Hello (Introduction and some devices enquiries)

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Asheekay

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Hi all.

I am Asheekay, a man from Pakistan. I am interested in electronics and have some idea about DLD (digital logic and design), studying it in one of the semesters in the college. However, I am generally ignorant about practical electronics applications.

For a start, I would like to know about relays. How many types of relays are there and from what range (as in, what is the minimum switching voltage for the smallest relay and how much power can it turn on). Also, how many types of relays are there?

Is there any useful link which I should read to get informed about them?
 
Hi and welcome to ETO

Try this link for starters 5VDC 2A miniature PCB relay:

A5W-K - RELAY DPDT 2A 5VDC RECT 10PCB

Mantech Electronics is an Electronic Component, Test and Measurement, Tool and Power Product Importer, Supplier and Distributor. Products are available from any one of our branches and distributors in JHB, DBN and CPT. We are committed to helping you succeed.!
www.mantech.co.za
 
DigiKey.com
Try the link above. Go to any company that sales electronics parts. Search for relays. DigiKey has 8 groups of relays covering 20,000 relays.
Examples: "automotive relays" are for 12 to 15 volts at high current and high vibration.
RF relays are for high frequencies.
Reed relays are small and usually low power.
Contactors are very large, high voltage, high current.
There are solid state relays with no moving parts.

DigiKey also has a way to search for the right type of relay. example: Input voltage =12, Switch current 10 to 20 amp, Switch voltage <=100 volts. Fill out the form and see how may will work.
Good luck and ask more questions.
 
Hi

First learn what a relay is and how it operates.

Try this link:
**broken link removed**

Then look at different relays in data sheets.

eT
 
Asheekay said:
How many types of relays are there and from what range (as in, what is the minimum switching voltage for the smallest relay and how much power can it turn on). Also, how many types of relays are there?
Click to expand...

You may also want to consider contactors. They are essentially the same as relays -- electromagnetic switches -- but are used when switching over approximately 20a and 240v.
If you can find electro-tech-online, I'm sure you're capable of finding information online about relays.
 
hyedenny said:
If you can find electro-tech-online, I'm sure you're capable of finding information online about relays.
Click to expand...

The internet is full of information about relays. I know what they are (in principle).

Thing is, the it's hard to find information about specific relays which sound interesting e.g. very low voltage/current relays (if there are any). Relays with two channels etc.
 
That's the link I gave you.

5VDC miniature relay. So... what else do you need know ?
 
Ok..wait...two channels?
If you're looking for pretty relays...that are interesting..... I've not found one yet. Relays are boring.
 
Asheekay said:
Thing is, the it's hard to find information about specific relays which sound interesting e.g. very low voltage/current relays (if there are any). Relays with two channels etc.
Click to expand...

Have a look through the links here:

General Purpose Relays | RS Components

Shop our range of General Purpose Relays supplies & accessories. Free Next Day Delivery. Browse our latest General Purpose Relays offers.
uk.rs-online.com

After selecting one of the classifications, you can set ranges of parameters such as operating voltage, number of contacts, contact voltage or current ratings etc. to find parts you are interested in.

Once you go to a specific item, eg.

General Purpose Relays | RS Components

Shop our range of General Purpose Relays supplies & accessories. Free Next Day Delivery. Browse our latest General Purpose Relays offers.
uk.rs-online.com

you can get usually find the datasheet for that relay in the "technical reference" block.


This is probably one of the more unusual ones, rated to switch signals down to a few millivolts and the coil is also very low power:
 
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