 how relay works ? |
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| jimkelly |
 Nov 6 2013, 06:02 AM
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#1
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Delaware USA  Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region  |
and can some describe how a relay works?
is it that HIGH AMPERAGE thru 85 and 86 operate a switch, and when switched send LOW AMPERAGE thru 30 and 87? what is 87A's purpose? Attached image(s) 
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| r_towle |
Nov 6 2013, 05:32 PM
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#2
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Current or load is always dictated by the device calling for the power.
Sizing the circuit (wire, fuse, relay) is always dependent upon the device being driven by the power. Power is not pushed, power is pulled by the device. Starter motor is a very simple example. The motor needs 600 CCA (cold cranking amps) so there is no fuse, just a fat wire directly connected to the battery. The relay for that motor (starter solenoid) needs 20 amps to flip the switch. So trigger amps requirements are fairly small, while the device amp requirements could be huge. All electricity is this way... |
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Posts in this topic
jimkelly how relay works ? Nov 6 2013, 06:02 AM
914itis How relay works Have fun Nov 6 2013, 06:29 AM
arcadeforever wow, thats a great document!
How relay works H... Nov 6 2013, 06:54 AM
JStroud
How relay works Have fun
Nice link, where did y... Nov 6 2013, 08:44 AM 914itis
[quote name='914itis' post='1952680' date='Nov 6 ... Nov 6 2013, 10:32 AM arcadeforever from what I can see.... oddly enough it appears 87... Nov 6 2013, 06:49 AM arcadeforever Shows how much of a newb I am, lol, I just saw in ... Nov 6 2013, 07:21 AM pcar916 To answer in short...
When the circuit is comple... Nov 6 2013, 07:57 AM pcar916 Bowlsby has a lot of information on his site.
htt... Nov 6 2013, 09:54 AM Dave_Darling I also have a write-up, about halfway down in this... Nov 6 2013, 10:02 AM pcar916 Forgot about this! That's a great write-up... Nov 6 2013, 10:07 AM jimkelly freakin ingenious.
since our cars are run from a... Nov 6 2013, 10:50 AM Spoke
freakin ingenious.
since our cars are run from ... Nov 6 2013, 11:53 AM pcar916
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i think image is correct?
30 is always a pe... Nov 7 2013, 03:19 AM underdog
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i think image is correct?
30 is always a p... Nov 7 2013, 07:52 AM Dave_Darling 30 is always a permanent ground.
No, 30 should be... Nov 7 2013, 09:43 AM Mike Bellis Current is limited by the fuse size and to some ex... Nov 6 2013, 11:41 AM Mike Bellis By the way current is stupid and don't know sh... Nov 6 2013, 11:47 AM Tom Relays use a small current to control a much large... Nov 6 2013, 01:09 PM Mike Bellis Read this...
Nov 6 2013, 08:00 PM jimkelly I believe pin 30 is always connected to either 87 ... Nov 7 2013, 08:41 AM Spoke
I believe pin 30 is always connected to either 87... Nov 7 2013, 09:25 AM Mike Bellis Relay nomenclature:
30: Common
87: Nomally Open
87... Nov 7 2013, 09:56 AM |
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