PTC (Solid State Motor Control)

[Power2all]

I came across the following Spec requirement for solid state motor control: The SSMC shall be capable of the following: Accuracy - Zero sequence CT with PTC

What does this mean? What is its significance?

 

[DRWeig]

I don't know what either zero sequence CT or PTC have to do with accuracy...

PTC is Positive Temperature Coefficient, a type of thermistor whose resistance increases rapidly with rising temperature. Good for motor protection. See attached.

Zero sequence CT is used for ground fault protection.

Best to you,

Goober Dave

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