Question about mechanical relay

[Megahertz]

I have a requirement to switch an inductive load (Motor) of 30-40Amp (starting current). The enclosure I have is restricting me to use one mechanical relay of 30-40Amp rating (because of the size). I would like to ask if it would be a good idea to switch this load using 6 x 5AMP mechanical relays. I can only use mechanical relays for this and not solid state ones.
I am not sure if by this approach I will risk any one relay getting stuck and burning out.
Thanks

[kellyseye]

Absolutely not - you should not use relay contacts in parallel under any circumstances. Look at getting a small automotive 12V coil relay or even consider using MOSFET(s) for the switching component.

[HenrikOlsson]

Agreed, don't do that. Get the correct part for the job.
Regarding the automotive relays, look out for the voltage rating on the contacts if you're switching anything above "automotive" voltages (12-24V) and their current rating with respect to AC and DC - which ever you're switching. Switching (interrupting) high DC currents is a lot harder than AC-currents.

Is it AC or DC? If AC, single phase or 3-phase? What voltage is it?

[Megahertz]

Thanks. It is an 230VAC single phase motor.

[kellyseye]

Go with an opto-isolated triac then.

[martintorres]

kellyseye, an opto triac to implement as auxiliary firing a triac may be, but this would only much smaller engine ... We are talking about 30-40 amp in starting, and then drop to 10/12 amp rated. To work with a triac, uqe would not only have to be a motor with brushes, but also the inductance you'd have to build a triac to implement, would be quite large and without knowledge of electronics, you will make it impossible.
If I were you, instead of making the circuit with relay, contactor and implement a shot of this, it could be a relay or with a Optotriac

NOTE:
motor a escobillas del tipo universal = motor ac universal brush:


contactor:


(aclaro y menciono por el tema de la traduccion)