Is there a 3-position selector switch (Internal-External-OFF) for fans & controls on 3000 series static load banks?

This selects whether the fan and controls power supply to be provided from either the external mains supply (External) or from the Supply-on-Test (Internal).

For static application, it’s expected that the load bank will have a permanent hardwired auxiliary supply. The cables for the external supply can be fed into the load bank through a separate gland plate. The external supply should be connected using the terminals provided inside the load bank.