In article ,
says...

more than likely a snubber network, they normally have a
resistor and cap in a single component..

Many times, they simply show it as a R across the coil because
it's in series with a cap.

http://en.wikipedia.org/wiki/Snubber

I haven't ever seen a snubber in a relay. It usually has the iron
designed to short-circuit fast field changes.

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We buy 24VDC relays with snubber networks in side on the coil, it
removes the need to put one on the terminals. It comes in handy when
you're doing a few rows of relays with PLCs and micro controllers
involved. They don't like the little pulse noise in the lines.

Those with diodes in them are ok for driver component protection but
they still can generate a noise pulse, just not a damaging one.

When you have bundles of wires tightly packed together, in
race ways and wire harnesses, like in cars, it can cross talk very well.


Jamie