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11/07/  · The PTC thermistor sensor is mounted in thermal contact with the equipment to be protected, and connected into the bridge arm of a comparator circuit, such as shown in Fig.1.

PTC thermistors, Positive temperature coefficient thermistors have a resistance which rises as the temperature increases (Fig 2.) and are not used for temperature measurement. They

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a start capacitor, a PTC resistance is available for approximately equal ohms. Table 3 can be used for conversion. Even though the start current may be the same, the start torques may differ depending on the motor design.The PTC has a fixed time built in. The start capacitor will stay in the circuit until a relay switches it out. The longer

ing and overheating protection are electric motors, genera- tors and transformers. PTC The PTC thermistor is a temperature-dependent component.

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A PTC thermistor is a resistor with a resistance value that increases when the temper- ature rises. motor size is selected, see the following table.

PTC thermistors have a non-linear resistance/ temperature response. At a specified The PTC's resistance values for motor protection are specified.

PTC thermistors are ceramic components whose electrical resistance rapidly increases when a certain temperature is exceeded. This feature makes them ideal for use in countless applications of modern electrical and electronic engineering, for example as resettable fuses against current overload or as shortcircuit protection in motors.

Cp is available in a range from 40degC to 120degC, selected by temperature characteristics Temp. sensing, Overheat sensing, Motor starting, Heaters (ⅲ) AR-AD Exhibits a less than linear resistance increase from room temperature to the Cp, with an abrupt resistance rise over the Cp. Temp. sensing, Overheat sensing, Over current protection, Motor