Could anybody ID this componant please?

[Tommy T]

Hi, I have found a burnt out componant that I can't identify. It is identified on the circuit board as PTC1 and is a small rectangle shape made of carbon. I take it that PTC ia a thermistor? Is there anyway I can obtain this online. How can I find the value of this componant, it has no identifiable letters on it.

Other than that is there a way I can replace the whole board. It is a Cuisinart Product?

Any and all advice welcome,

Cheers

[Tommy T]

Forgot to mention... It is  a Cuisinart SSB1U soupmaker/blender.

[Budget Appliance Repair]

Pretty sure that is a Varistor.

Burns out on major power surge - it is designed to clamp lower power surges but can only handle so much, (usually directly connected between line and neutral - near the main power input).

What does a varistor do?

Varistors are used to protect a circuit from high voltage surges. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit. A capacitor may be installed across the signal lines. However, this capacitor cannot suppress voltage surges

A varistor is a voltage dependent resistor (VDR). The resistance of a varistor is variable and depends on the voltage applied. The word is composed of parts of the words “variable resistor”. Their resistance decreases when the voltage increases.

What happens when a varistor fails?

Under different current conditions, failure modes include electrical puncture (see Figure 4), physical cracking (see Figure 5), and thermal runaway. Cracking happens because varistors are basically a ceramic material, and hitting them with a sharp high-amplitude surge is like hitting a dinner plate with a hammer.Aug 31, 2020

 

Edited November 14, 2022 by Budget Appliance Repair

[Terry Carmen]

I think the blue things are the MOVs (Metal Oxide Varistors).

PTC should be a Positive Temperature Coefficient thermistor, but that's pretty huge and doesn't look like any I've ever seen, so I'm pretty much out of good guesses. 8-)

Edited November 14, 2022 by Terry Carmen

[Budget Appliance Repair]

@Terry Carmen You're right, I missed the round blue disc Metal Oxide Varistors.

That maybe a power supply capacitor across the line to filter power supply noise.

I have a Whirlpool range control board with a similar component burnt out and it's Metal Film Non-Polarized Capacitor, (not burnt up like the one here but side blown out and melted silver innards came out one end).

Edited November 14, 2022 by Budget Appliance Repair

[Tommy T]

Thanks all for the info. I am hunting down another one for parts.