http://www.pandbrelays.com/app_pdfs/13c3311.pdf
http://www.mosaic-industries.com/Download/pdf/m…&snubarelay.pdf
"The relay contacts may be used to turn on and off inductive loads using either AC or DC. In either case, when the relay opens, the inductive load can cause arcing at the relay contacts. For this reason the contacts should be snubbed with an RC network and a voltage clamping device."
http://www.mod-tronic.com/API/appnotes/g5an039.pdf
"For DC inductive loads (see Figure 2), place a diode across the load (1N4006 recommended) being sure to observe proper polarity. Use of an RC snubber is an optional enhancement."
Mach mal nen google nach snubber, DC und arcing, relay, usw.
MfG,
scotchco