I already have a few of these but I doubt if they are strong enough https://www.ebay.com.au/itm/AC-660V...e=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

 

Interesting read ...........https://www.carlingtech.com/amp-hp-volts

 

What is meant by thermal current rating (Ith) for Contactor "D" or "F" type ?
It means the rated current that this contactor can switch for Load category AC1 (thermal loads),

Example: LC1D09 is 9 A on AC3 and its thermal current (Ith = 20 to 25 A) (this means it can switch up to 20 or 25 A for loads of AC1 https://www.se.com/eg/en/faqs/FA173391/ ...Now I understand "ith" Properly

 

Are you sure you get it? You need to understand the differences between AC1 and AC3. https://www.schneider-electric.us/en/faqs/FA120833/ Which is what I was saying in post #4.

A contactor is just like a relay, and it is different that a common switch in the amount of current it can turn on or off. And you choose one to suit the load in either case.

 

I already have a few of these but I doubt if they are strong enough https://www.ebay.com.au/itm/AC-660V-10A-Red-Mushroom-Cap-1NO-1NC-DPST-Emergency-Stop-Push-Button-Switch/322762964742?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

Those are for the Control Circuit as per the E_stop button in the #16 post schematic.
Not for switching high current.
It seems you are confusing low power switching with the High current capable versions.
Max.

 

Are you sure you get it? You need to understand the differences between AC1 and AC3. https://www.schneider-electric.us/en/faqs/FA120833/ Which is what I was saying in post #4.

A contactor is just like a relay, and it is different that a common switch in the amount of current it can turn on or off. And you choose one to suit the load in either case.

AC1 is primarily for resistive loads and small inductive loads where the power factor exceeds .95 mine are .95 and .85 for the 3p motor thus AC3 applies in my case.The ith value of a switch is determined by it's ability to withstand heat generated by the amps ,but when determining it's value for a specific project one must also consider the humidity and height above sea level (atmospheric pressure) above 5000 meters the switch voltage and current must be derated ( I presume for arcing as pressure will increase that possibility and the contacts should be made from suitable suppressible materials) as these factors also contribute to possible films developing on the contact and the longevity of switch life and switch performance .

 

Those are for the Control Circuit as per the E_stop button in the #16 post schematic.
Not for switching high current.
It seems you are confusing low power switching with the High current capable versions.
Max.

Not really but sort of, I understand that they must be wired differently to what I am used to,as in what is called "Ladder logic" ? I am still investigating contactors to improve my knowledge.The main thing I don't grasp is if a contactors coil is controlled by 240 volts how can low power be there?....EDIT ... Think I have it ....The contactor itself only draws a very small current and as the switch's are on the coil they will only have a small amount of current,when the coil is energized the armature moves and makes contact with the high current contacts and thus allows current to flow to the motor ?

 

The main thing I don't grasp is if a contactors coil is controlled by 240 volts how can low power be there?....EDIT ... Think I have it ....The contactor itself only draws a very small current and as the switch's are on the coil they will only have a small amount of current,when the coil is energized the armature moves and makes contact with the high current contacts and thus allows current to flow to the motor ?

Correct.
Ladder logic is the way that industrial control schematics have been drawn for many decades now.
Once you get used to it, it is a much easier way to study a circuit or trouble shoot.
If one day you ever get into PLC control, you will appreciate even more.
Max.

 

Correct.
Ladder logic is the way that industrial control schematics have been drawn for many decades now.
Once you get used to it, it is a much easier way to study a circuit or trouble shoot.
If one day you ever get into PLC control, you will appreciate even more.
Max.

PLC control,by that you mean PID's if so I already use them for proportional temperature controllers in my incubators.I breed rare chickens.I figured if I can learn genetics I can learn more about electrical things.I also have an Arduino Uno r3 which eventually I will use to build auto blast gates

 

AC1 is primarily for resistive loads and small inductive loads where the power factor exceeds .95 mine are .95 and .85 for the 3p motor thus AC3 applies in my case.The ith value of a switch is determined by it's ability to withstand heat generated by the amps ,but when determining it's value for a specific project one must also consider the humidity and height above sea level (atmospheric pressure) above 5000 meters the switch voltage and current must be derated ( I presume for arcing as pressure will increase that possibility and the contacts should be made from suitable suppressible materials) as these factors also contribute to possible films developing on the contact and the longevity of switch life and switch performance .

Copying and pasting doesn't, to me at least, show you're understanding what it means. sorry.

 

Copying and pasting doesn't, to me at least, show you're understanding what it means. sorry.

I didn't I wrote that