Any one have a good idea to stop the EMI coming from switching AC relays. We keep getting whacked by these huge spikes whenwe switch off the loads. We have bi-directional zener on the power supply and MOVs on the contacts of the small relays that fire the larger relays. The small relays are using the reverse-biased diode for suppression which seems to work really good. Just wish it would work for the AC relays as well. What keeps happening is the processor kepts resetting. Not all the time but a good chunk of the time though. Any suggestions would be greatly appreciated.