Ptc Thermistor Wiring Diagram

How a refrigerator ptc relay working and function in the refrigerator compressor we use the split phase single phase induction motor and this motor have internal two types of winding which we called running. A thermistor is a type of resistor whose resistance is dependent on temperature more so than in standard resistors the word is a combination of thermal and resistor thermistors are widely used as inrush current limiters temperature sensors negative temperature coefficient or ntc type typically self resetting overcurrent protectors and self regulating heating elements positive. The datasheet for the sl03 ptc thermistor can be found at the following link.

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Consequently cables between the thermistor protection relay and the ptc thermistor sensors should be selected and installed with a view to minimizing the effects of induced noise.

Ptc thermistor wiring diagram. When the thermistor is mounted there must not be any foreign body between the electrode of the thermistor and the clamping contact. It seems you are reading the ptc or thermistor not the contacts. The performance of thermistor protection relays can be affected by external electrical interference where voltages can be induced into the sensor cable. Ptc means positive temperature coefficient thermistor however we can called starting relay or compressor starting relay in simple words.

Because you aren t getting a dead short on any test you either have a bad relay or you aren t testing properly. A thermistor acts as a variable resistor which changes in accordance to the amount of heat that the thermistor is exposed to. En 60947 8 low voltage switchgear and controlgear control units for built in thermal protection ptc for rotating electrical machines en 50495 safety devices required for the safe functioning of equipment with respect to explosion risks. The thermistor is a solid state temperature sensing device which acts a bit like an electrical resistor but is temperature sensitive.

The sirius 3rn2 thermistor motor protection relays comply with the following standards. Ptcsl03 ptc thermistor datasheet. The thermistor is electrically between the contacts of the relay in parallel with the relay contacts. One should read zero ohms which is a dead short.

The ptc thermistor unlike the ntc increases in resistance with increasing temperature. The thermistor temperature sensing system consists of positive temperature coefficient sensors ptc embedded in series of three one between each phase and a matched solid state electronic switch in an enclosed control module. When ptc thermistors are encapsulated with sealing material the precautions given in chapter mounting instructions sealing and potting must be observed. Thermistors can be used to produce an analogue output voltage with variations in ambient temperature and as such can be referred to as a transducer.

A set of sensors consists of three sensors one per phase.