Question

Which is better, ELCB 30mA or 100mA?

Answer 1

When choosing between an ELCB (Earth Leakage Circuit Breaker) with a rating of 30mA and 100mA, the right option depends on the specific application and safety requirements.

1. 30mA ELCB

1. Better for Safety: A 30mA ELCB is generally recommended for human safety. It trips when the earth leakage current exceeds 30mA, which is the threshold that could be harmful to humans. It is most commonly used in residential, commercial, and industrial settings where personal safety is a priority.
   

1. Protects against Electric Shocks: If someone comes in contact with a live wire, this type of ELCB is more likely to detect the leakage current and cut off the power, reducing the risk of electric shock.
   

  

2. 100mA ELCB

1. Better for Equipment Protection: A 100mA ELCB is less sensitive compared to a 30mA, which means it’s typically used in industrial environments where the goal is to protect equipment or larger installations from damage caused by earth leakage, rather than focusing on human safety.
   

1. Less Frequent Tripping: Since it trips only when the leakage current is above 100mA, it’s less likely to trip for minor leaks or small electrical faults that might not pose an immediate risk to people but could still damage equipment.
   

Conclusion:

1. For human protection (such as in homes or places where people work or live): 30mA is better.
   

1. For equipment protection (in industrial settings or larger installations): 100mA may be more suitable.
   

But, for maximum safety, especially in places where people are present, 30mA is usually the safer choice.