Circuit Breaker

Q1. What is a circuit breaker?

A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by overload or short circuit. It automatically interrupts the flow of current when a fault is detected.

Q2. How does a circuit breaker work?

It works by sensing abnormal current flow (overcurrent, overload, or short circuit) and mechanically switching off the electrical circuit to prevent damage.

Q3. Can an HMI be customized?

Yes. HMIs can be programmed with custom screens, graphics, alarms, recipes, and multi-language support depending on the application.

Q4. What are the main types of circuit breakers?

MCB (Miniature Circuit Breaker) – for low current ratings in households.
MCCB (Moulded Case Circuit Breaker) – for higher current applications in industries.
ELCB/RCCB (Earth Leakage Circuit Breaker/Residual Current Circuit Breaker) – for protection against earth faults and leakage.
ACB (Air Circuit Breaker) – used in low-voltage distribution.
SF6 Circuit Breaker – used in high-voltage applications.

Q5. Can a circuit breaker be repaired after tripping?

Yes. If the breaker trips due to overload, it can be reset manually after correcting the fault. However, if it trips frequently, replacement or inspection is needed.

Q6. How do you maintain a circuit breaker?

Perform periodic inspection for burns, cracks, or loose connections Clean terminals and contacts Test tripping mechanism Ensure load is within rated capacity