Question

The recommended level of RCCB (Residual Current Circuit Breakers) is ________ in residences.
1. 30 mA
2. 100 mA
3. 300 mA
4. 50 mA

Answer 1

Correct Answer - Option 1 : 30 mA

Residual Current Circuit Breaker (RCCB):

• It is a differential current sensing device used to protect a low voltage circuit in case of a leakage fault. It is sometimes also known as Residual Current Device (RCD).
• It contains a switch device that switches off (in a fraction of a second), whenever the current leaks out and does not return back through neutral.
• The RCCB provides protection from small current leakage arising due to accidental touch by human being or insulation failure, which is not possible by MCB or fuse alone.

 

Ratings of RCCB:

• 30 mA is recommended for residence for safety purpose
• 100 mA is recommended for industrial establishments