Do these relays serve a different purpose?

[getLuke]

Learning electronics at the moment.

Is there a difference to these relays?

The diagrams look different so I suspect they may be different, right?

179041

[Ferret]

..

[ChookD2]

https://www.youtube.com/watch?v=Ac7G7xOG2Ag

[Tote]

They are odd relays as they both appear to have a capacitor across the coil for the solenoid, the purpose of which would be to dampen any voltage spikes generated by the collapse of the magnetic field on the coil when it is deenergised.
Without knowing the context it is hard to understand why the yellow one is arranged differently, although the black one looks fairly standard except for the cap.

Regards,
Tote

[PhilipA]

Old RRC (my 91) with injection had the capacitor on the fuel pump relay.
Regards PhilipA

[BradC]

I suspect they're pretty similar. If you look at the pin numbers, they're the same for the same function on both.

Generally in automotive relays there's a resistor across the coil rather than a capacitor. The purpose is to try and limit the peak back EMF spike without slowing down the open time like a flywheel diode can. Without anything you can develop voltages > 100V. It doesn't take much of a resistor to knock that down below the breakdown voltage of the driver circuit.

I've never seen a capacitor across a coil in an automotive setting. No to say they don't exist, but a cap big enough to effect any material change in back EMF is going to slow down both the open and close times and work the driver a lot harder. A cap across the contacts? Absolutely, but not built into the relay.

[AK83]

I'll 2nd Brads assessment.

resistor(is common on some relays).

if you look at the pinouts;

yellow has a switch between pins 3 and 5, triggered by the coil and resistor between 1 and 2.
black has a switch between pins 3 and 5, operated by the coil and resistor between 1 and 2.

ie. same.

There are a few different relays up there if you look carefully.
Note the grip tab on the top of the relay body. Those two have the diagonal type.
There are other relays fitted that have a vertical(or horizontal) grip tab instead.

from what I can see, the horizonal tab relays look to be lower (current) rated than the diagonally tabbed types, otherwise the pole layout appear to be identical. The much thicker poles are on the 1 and 5 position which is the main feed from power to the device.

If you research more info on relays, you will generally find that they use the pole identifiers of 85, 86, 87, 87a and 30.
The corresponding pinout from these Siemens 1/2/3/5 pin types to the more usual pin numbering is that pins 1 = 86, 2 = 85, 3 = 30 and 5 = 87.
if you have a peek in RAVE's electircal section under power distribution, and go to the fuse boxes, the pinouts for the relays use the universal 85, 86, 87, 87a and 30 numbering system.

Not normally vital info for every day life, but in your situation with your starting/aux delay issue, knowing that if you bridge the main power sockets(ie. 3 and 5 or 30 and 87) on your relay socket(ie. the fuse box part) will power up that system.

Alternatively: if you fitted a multimeter(or test light) between sockets 1-2 (85-86) and hit the switch for that device, then then you will either see voltage or light when that switch is activated.
This is just general info on what a relay does, not specific to your issues.

In your situation tho, those two relays auto power up depending to your key position. So, if you pull say the aux relay, and use a multimeter or test light in pins 85/86(remembering that RAVE uses this numbering system!) then you should see voltage or light once you hit the first click on the key.

[GJC]

Learning electronics at the moment.

Is there a difference to these relays?

The diagrams look different so I suspect they may be different, right?

179041

From what I can see in your photo, they look the same to me. The diagrams are just drawn differently. There both appear to be SPST with the same pin number markings in the diagram. Without seeing the bottom, it's hard to tell if the pins are in the same position or not. If the pins are marked with the same numbers in the same position, then I'd say that they're equivalent.

[scarry]

Looking at the pics,the relays switch the same NO contacts,but could have different voltage coils and load ratings.

[drivesafe]

Learning electronics at the moment.

Is there a difference to these relays?

The diagrams look different so I suspect they may be different, right?

179041
Hi Luke and both relays are AUTOMOTIVE relays and are the same, only the diagram on each relay is displayed differently.

The resisters are standard in most AUTOMOTIVE relays these days, to help remove back EMF spikes , as a means of protecting other electronic devices in the vehicle.

[Dorian]

x 3 or 4 for they are the same in terms of function and wiring.

The box without the slash, wired across the coil is drawn as a generic 'snubber',
so for an AC control voltage it would be a capacitor and resister in series
and for a DC control circuit it would usually be a diode wired in 'reverse'.

NB - Many use the term 'snubber' for the AC circuit only.

For a DC coil you could use a resistor but it would increase the background load on the controlling device which would be something that is generally avoided.

In an industrial setting, if there is no snubber circuit drawn you would wire one in externally, although if the coil were small and you were driving it with a transistor you would not bother.

Cheers Glen