Hello

I an battery discharger, I found the following contactors used. It can handle up to 100A current. But not sure what these DC contactors are. Can someone identify this?

 

They appear to be motor start relay/contactors, the one's shown are similar to those used in RR Engine units to start the diesel operated generator.
2 for the DC coil, 2 for the contacts.
Is there a manuf name or loge etc?

 

They appear to be motor start relay/contactors, the one's shown are similar to those used in RR Engine units to start the diesel operated generator.
2 for the DC coil, 2 for the contacts.
Is there a manuf name or loge etc?

Unfortunately not a single print on the part. These are surely DC contactors.

 

Do you know the coil voltage?
There are quite a few options out there, a 200amp one on Amazon for one !
If coil unknown, slowly apply a DC voltage and see when it picks up, go ~ 20% higher than this value for coil.