The vacuum interrupters are applied in different switchgears. "TF"means it applies to load-break switch; "TD" means it applies to circuit breaker; "TC" means it applies to recloser; "TJC" means it applies to contactor.

Vacuum interrupters can be applied in high altitude areas,but you should confirm if the withstand voltage meet the requirement.

There are AMF(Axial Magnetic Field) and TMF(Transvers Magnetic Field) structure for the contact.There's no much difference between the two structure at the rated short-circuit breaking current below 12kV 31.5kA. However, AMF structure performaces better and gets longer life over 40kA. 

Apart of the technical parametre of the embedded pole，it's very important to confirm the size of mounting base and the height to the terminal.