What is the difference between these two? 1

[icecoder]

Hi all,

1) I was working on power distribution symbols and have seen these two symbol. What is the difference between two? Is there anyone that can explain?

and this one

2) Also are these ones electronic type cb symbol? Else how can I show that this cb is electronic type?



Thank you very much

 

[icecoder]

Noone knows?

 

[Mbrooke]

I am guessing heaters, perhaps for an overload, but unsure to be honest.

 

[Skogsgurra]

The first one has thermal and instantaneous trip. The second one has only instantaneous trip.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[icecoder]

How about showing electronic type trip? Is there a way to show that? Is there a way to show that it is solid state trip?

 

[Skogsgurra]

You can add a transistor symbol or an Opamp symbol to the diagram to indicate that it has electronics in it.
Google "circuit diagram symbol" and select the standard you are working with. There is a very big difference between European and US symbols. The US NO relay contact is a European capacitor. As an example.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[cranky108]

These don't look like anything from the US, but then again I don't work on lower voltages very much.
On the power side we show the IEEE numbers as the operators, and CT's if they exist. But here there may only be a small resistor to measure the voltage across.

This appears to have an electromechanical operator, rather than a pure mechanical operator.

 

[waross]

Skogs beat me to it and said it better than I could.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[HCBFlash]

Skogs hit it squarely.
(No surprise there)

.

(Me,,,wrong? ...aw, just fine-tuning my sarcasm!)

 

[icecoder]

Thank you all, I think so. It is a mechanical type trip with thermal protection in it also.

 

[krisys]

icecoder

Instead of showing transistor or Opamp, just mention SST,(Solid State Trip) and below LI (Long time and Instantaneous).

The shown symbol is from IEC world.