Universal Solid State Relays Replace Refrigerator Freezer Compressor IC-1 IC-2 IC-3 IC-4 PTC Start Relay

PTC’s are used as heaters and self resettable fuses. They are not used for precise temperature control. PTC’s can not be manufactured economically with tight resistance tolerances. Typically, the resistance of a PTC is around ±15 or ±20%. NTC’s are used for precise temperature control. NTC’s can be manufactured to very tight resistance tolerances and temperature accuracies. Typically, the resistance of a NTC is around ±5%, ±3%, ±2%, ±1% or less.