School me on relays...

[CJL]

So I found a diagram for An application that im doing and it shows me how to wire up a relay. But in the diagram it shows a relay with the following posts numbers.......

----87

85-87a-86

----30


Now I have about 3 relays at home but on the back of 2 of them it shows these following posts numbers...

----87

86-87a-85

----30


and the last one show the same as above but has no marking of ''87a'' in the middle,just a 87. Mind you the middle post is not used in this app anyway..


With that being would I have to buy new relays that match the post number markings in the diagram?

[rocky 59]

87 is your switched on or off, 30 your switche if you will, 85 i believe is power and 86 ground

[CJL]

So the post numbers wouldnt matter?

[Cameron_B]

87 is your switched on or off, 30 your switche if you will, 85 i believe is power and 86 ground

So 87 and 30 is the coil?

[rocky 59]

i believe so yes

[Stephen_c]

85 -
86 +
30 is your source
87 and 87a are you outputs

85 and 86 are the coil add a switch to either to control the relay.

[DBBOOM]

http://www.parts-express.com/resources/relays.html




Schooled.

[Stephen_c]

87a is your normally closed output
87 is normally open

[Cameron_B]

OK, so 85/86 is the coil/trigger and 87a n/c 87 n/o

[CJL]

85 and 86 are the coil add a switch to either to control the relay.

So that means I can can use the relays I have now?

Basically, It dont matter which side 86 and 85 are on? They do the same thing?

[Cameron_B]

85 is connected to the ground of the triggering voltage.
86 is connected to the positive 12V of the triggering voltage.

Taken from P/E


Test it by connecting this way, if you hear a "click" when voltage is applied it works.

[blue200sx]

it doesnt matter which side 85 and 86 are on and it doesnt matter if 85 or 86 is positvie or negative. just know you need a ground on one and power on the other to energize the relay.

[Cameron_B]

Just checked with a spare relay, blue is right polarity doesnt matter.

[CJL]

Ok the reason for asking is because in the diagram in the link below,notice the 85 is on the left and 86 is on the right. and the relay I got at home the 86 is on the left and the 85 is on the right.

http://64.85.6.129/extrainfo/diagram...BS%20UNITS.pdf

And notice here in this diagram below the 86 is on the left and the 85 is on the right(like the one i got at home). So that made me think there were 2 different type of relays.

http://64.85.6.129/extrainfo/diagram...%20DIAGRAM.pdf

[blue200sx]

yeah but it doesnt matter. which side 85 or 86 is on they are both single pole single throw relays.