Is there a resettable fuse on the interlock circuit for model 4200A-SCS?

Is there a resettable fuse on the interlock circuit for model 4200A-SCS?

Yes, there is a resettable fuse. It takes several minutes to reset, please give it some time.
This is discussed on page 4 and 5 of the included application note.

Here is a link to the application note on the Tek website:

https://www.tek.com/document/application-note/safely-using-interlock-keithley-model-4200-scs