What are the protections used in Class III & Class IV 415 V LV side?

What are the protections used in Class III & Class IV 415 V LV side?  
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1 Answer

Answer :

Class III 415 V LV side

1. 51 (inverse over current)

2. 50 (instantaneous over current)

3. 27 (under voltage)

4. 51N (earth fault)

5. 64 (REF) 


Class IV 415 V LV side
1. 51 RYB (inverse over current)
2. 51N (earth fault) 
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