I have a multi-relay module that is use to control my crossing accessories. The relays each handle up to 10A. However, I am limited to only 1 power bus to power all of the crossing accessories (thru the relays). I supply the flashing light device with 12 VDC and installed LEDs and that works fine. However, the crossing gates and gateman have very low internal resistance and my only power bus is at 18 VAC. At that level, it would not take long to cook the solenoids in these devices if on too long. I looked up high power/low resistance pot's (to limit the current to the on threshold level), but they are very expensive. Are there any new devices on the market that operate at a much lower power level so I could buy cheap pot's to adjust current to threshold-on level?
Or any other ideas or suggestions.