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2024-08

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Functional parameters of plastic encapsulated patch varistors

1. Rated voltage (Ur): refers to the highest voltage that PPTC can withstand, usually expressed in volts (V), such as Ur=24V.

2. Power outage current (IH): refers to the current that cuts off the circuit when the temperature of the PPTC rises at rated voltage, usually expressed in amperes (A), such as IH=1A.

3. Trigger current (IT): Refers to the current at which PPTC begins to respond, that is, when the current gradually increases to a certain value, PPTC will begin to reduce resistance, usually expressed in milliampere (mA), such as IT=100mA.

4. Zero current resistance (Ro): refers to the resistance value of a circuit passing through PPTC when it is in a normal state, usually expressed in ohms (Ω), such as Ro=40 Ω.

5. Maximum current (Imax): refers to the maximum current that PPTC can pass through, usually expressed in amperes (A), such as Imax=3A.

6. Working temperature (Tw): refers to the normal operating temperature range of PPTC, usually expressed in degrees Celsius (℃), such as Tw=-40 ℃~+85 ℃.

7. Reset temperature (Tr): refers to the temperature at which PPTC returns to a low resistance state after being triggered and in a high resistance state for a period of time. It is usually expressed in degrees Celsius (℃), such as Tr=25 ℃.

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