They are mag switches. Without a print i cant be 100 percent sure but I think those switches pick and drop the ice cube relays on the NTS board. Any Im not having any issue with those ice cube relays not picking or dropping. But when I put my meter to MI+ to GAN I am suppose to have 6.4 vdc when only two relays are up but I have no voltage and I look at my motion excuses it says reset drive.