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Silicon · 15th Dec 2015, 2:18 pm

It might be an STC thermistor type CZ9A. These were marketed as Brimistors.

It has a resistance of 350 Ohms at 20 degrees C and 800 Ohms at Zero degrees.

The length is 3/4" and diameter is 5/16".

It can be used on the primary of mains transformers to limit 'switch-on surge'.
Get the application notes because it can be damaged if the peak current is too high.

They are designed to get hot in normal use.

15th Dec 2015, 2:18 pm	#3
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,169	Re: What are these ? It might be an STC thermistor type CZ9A. These were marketed as Brimistors. It has a resistance of 350 Ohms at 20 degrees C and 800 Ohms at Zero degrees. The length is 3/4" and diameter is 5/16". It can be used on the primary of mains transformers to limit 'switch-on surge'. Get the application notes because it can be damaged if the peak current is too high. They are designed to get hot in normal use.