No ,there are no ratings on the pish buttons,
Last option i had that to use a 30 amp 250 volt relay

... always allow a little extra for safety ... 40 amp is better.

 

... a circuit diagram or sketch would make things clear.

This site may help.
Telemecanique wiring diagrams
Max.

 

... only single phase motors have the start up transient current. Three phase powered motors don't have this problem.

Thats a new one on me!!
Max.

 

A peek inside (picture of the inside) MIGHT help. Control voltages can be anything. In the US a 208/240 motor will likely have a step down transformer to 120 VAC, but HVAC systems use 24 VAC. Stuff operated by PLC's might even have 24 VDC.

In these START/STOP controls, the START button is NO - Normally open and would be in parallel and the STOP button is NC (Normally Closed) and would be in series. The voltages and the NO/NC status can be easily checked. Your relays (2 of them) may have to be a TIME DELAY (one shot relay).

Usually, motor starts are not that complicated.

 

I
But all i want to say that i want replace only the start stop switch with two relay my relay coils will be driven by a circuit that i made,i want to connect the push buttons in the "no" pin off the relay so i want to know that what are the volt and amp ratings in the push button pins

Stop/Start P.B.s carry a trivial load when used to pick up a relay or contactor.
It is what ever the load current of the coil, usually no more than a couple of amps.
Max.

 

Stop/Start P.B.s carry a trivial load when used to pick up a relay or contactor.
It is what ever the load current of the coil, usually no more than a couple of amps.
Max.

Thanks a lot. Your information is really helpful.helped me a lot.

 

Stop/Start P.B.s carry a trivial load when used to pick up a relay or contactor.
It is what ever the load current of the coil, usually no more than a couple of amps.
Max.

Just rewired my metal cutting lathe, the 'control' circuit had a 2amp fuse in it, for pulling in 3 contactors.

 

As usual, half the 'helpful' responders have failed to understand the OP's requirement!

He has a motorised pump with a control panel with start and stop buttons on it. Clearly the motor is actually switched on and off via a contacter - a momentary start push-button wouldn't do it, would it?

He wants to start the pump remotely, therefore he wants to cause the contacter to pull in by means of a relay rather than a push button. As MaxHeadroom said earlier, the only requirement, therefore, is to switch the contacter coil current. Typical consumption for a contacter for a pump like that would be 5 - 10VA with an inrush of probably 10X that. So any relay with a contact rating in excess of about 1 amp should be fine.

It would be very foolish to do as some seemed to suggest, and run the motor directly through a 40A relay, or whatever. Motor start contacters have built in over-current protection, stall protection etc.

 

As usual, half the 'helpful' responders have failed to understand the OP's requirement!

He has a motorised pump with a control panel with start and stop buttons on it. Clearly the motor is actually switched on and off via a contacter - a momentary start push-button wouldn't do it, would it?

He wants to start the pump remotely, therefore he wants to cause the contacter to pull in by means of a relay rather than a push button. As MaxHeadroom said earlier, the only requirement, therefore, is to switch the contacter coil current. Typical consumption for a contacter for a pump like that would be 5 - 10VA with an inrush of probably 10X that. So any relay with a contact rating in excess of about 1 amp should be fine.

It would be very foolish to do as some seemed to suggest, and run the motor directly through a 40A relay, or whatever. Motor start contacters have built in over-current protection, stall protection etc.

Atlast someone finally solved it realy nice.thanks for you rply.i already soughted it out.thanks for your rply.