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How to check SIOV (PTC Thermistor) C945 - Good or to replace?

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pppopol:
Hi,

I have a doubt about the test of a SIOV (PTC Thermistor) C945 from TDK which tells me to the 0.45 Ohm.

See technical data here:https://www.tdk-electronics.tdk.com/inf/55/db/PTC/PTC_OC_Leaded_12V_C945_C995.pdf

I find in the datasheet a "Rr" of 0.45 Ohms, is this correct?
Is this the value I need to measure?

Thank you in advance for your reply.

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