input of my power supply ~ 230vac 50hz
output 1 ~ fix 250 v ac from 4 amp..variac > digital volt & amp. meter
output 2 ~ 0 to 270 v ac from 4 amp. variac.> load (ac circuit under test)
output 3 ~ o to 270 volt dc ( path ac > variac > variable ac output of variac > isolation transformer > bridge rectifier > LCR filter > variable dc output > load (dc circuit under test)
can any one suggest precise perfect current protective devices with its perfect location in circuit with its ratings for the above power supply which protects power supply, main ac supply and user from all hazardous shock and accident & with these device power supply satisfy overload & short circuit protection condition too

 

Depending on your country, i would use an Rcd or Gfi on the mains input and a 6amp breaker, this will protect the AC outputs.
The DC output rating depends on the transformer output current capacity so select a breaker for that rating.

You can use fuses but then you will need to keep replacements.

 

Depending on your country, i would use an Rcd or Gfi on the mains input and a 6amp breaker, this will protect the AC outputs.
The DC output rating depends on the transformer output current capacity so select a breaker for that rating.

You can use fuses but then you will need to keep replacements.

thanks for ur reply. pl. note as below.
0) my country is india.
1) pl. clear what is Rcd or Gfi & their ratings?
2) transformer output current is 4amp.
3) pl. reply asap.

 

The simple and likely most affordable protection would likely be fuses. Fuse the primary and secondary of each autotransformer (Variac).

A GFI or GFIC is:

A ground fault circuit interrupter (GFCI), also called Ground Fault Interrupter (GFI) or Residual Current Device (RCD) is a device that shuts off an electric power circuit when it detects that current is flowing along an unintended path, such as through water or a person.

So it is a safety device which shuts down a circuit when a ground fault is detected. A ground fault circuit interrupter (GFCI), also called Ground Fault Interrupter (GFI) or Residual Current Device (RCD) is a device that shuts off an electric power circuit when it detects that current is flowing along an unintended path....

Ron