These things look like MOVs, but you cant use an MOV in the circuit like that. not in series with the supply voltage. at TB7 i have 240 volts. TB6 feeds 3 dc power supplies. TB8 feeds a monitor and another power supply. TB8 has 240 volts. The #1 25R 3A was blown apart. So, no 240 volts at TB6. I just cant figure out why a MOV or thermister would be in that circuit.
bq). PTC thermistors can be used as current-limiting devices for circuit protection, as replacements for fuses. Current through the device causes a small amount of resistive heating. If the current is large enough to generate more heat than the device can lose to its surroundings, the device heats up, causing its resistance to increase, and therefore causing even more heating. This creates a self-reinforcing effect that drives the resistance upwards, reducing the current and voltage available to the device.
bq). NTC thermistors can be used as inrush-current limiting devices in power supply circuits. They present a higher resistance initially which prevents large currents from flowing at turn-on, and then heat up and become much lower resistance to allow higher current flow during normal operation. These thermistors are usually much larger than measuring type thermistors, and are purposely designed for this application.
bq). "The inrush current limiter is normally placed in series with the diode bridge, motor, or other components of a system that benefit from inrush protection. For added protection, two Surge Limiters can be placed in series."
