What Are the Types of Circuit Breakers?

Circuit breakers are important safety devices in any electrical system. They help protect wiring, appliances and people by cutting off power when a fault happens. In Singapore homes and buildings, different types of circuit breakers are used depending on the purpose of the circuit and the level of protection needed.

Why Circuit Breakers Are Important

How to identify circuit breaker type?

To identify circuit breaker type, it's essential to understand the categories they come in, namely Types A, B, C, and D. These types differ primarily in their instantaneous tripping current profiles, which are designed to match the sensitivity required in various applications. 

MCB (Miniature Circuit Breaker)

MCB protects a circuit against overload and short circuit. It is commonly used in lighting circuits, socket circuits and other smaller electrical loads in homes.Common use of MCB:

• lighting points
• wall sockets
• fan circuits
• normal household circuits

RCCB (Residual Current Circuit Breaker)

RCCB helps protect people from electric shock by detecting leakage current. It trips when there is an imbalance between live and neutral current, which may happen when electricity leaks to earth.RCCB is commonly used as a main safety device in many homes.

RCBO (Residual Current Breaker with Overcurrent Protection)

RCBO combines the function of MCB and RCCB in one device. It protects against overload, short circuit and earth leakage at the same time.Many property owners prefer RCBO because it gives more complete protection for individual circuits.

MCCB (Moulded Case Circuit Breaker)

MCCB is usually used for larger electrical loads or commercial systems. It can handle higher current than a standard MCB and is more common in bigger buildings or industrial setups.

What Is the Difference Between MCB, RCCB and RCBO?

MCB protects wiring from overload and short circuit.
RCCB protects against earth leakage and electric shock.
RCBO combines both protections in one breaker.This means each breaker has a different role, and the correct selection depends on the electrical setup.

Which Circuit Breaker Is Common in Singapore Homes?

In Singapore homes, MCB, RCCB and RCBO are the most common types. The actual setup depends on the DB box design, wiring layout and level of protection used in the property.

Signs a Circuit Breaker May Have a Problem

You may need checking if:

• breaker trips often
• one circuit keeps losing power
• DB box feels hot
• there is burning smell near the panel
• breaker cannot reset properly
• power trips when certain appliances are used

When to Call an Electrician

If your breaker keeps tripping, feels loose, smells burnt or does not reset properly, it is safer to get it checked by an electrician. Repeated tripping may be a sign of overload, faulty wiring or appliance issues.

Contact Lito Electrical

If you need help checking a tripping breaker, faulty DB box or electrical fault in Singapore, contact Lito Electrical for safe inspection and repair support.Use these internal links naturally in the article:

• DB box repair Singapore
• MCB keeps tripping Singapore
• RCCB keeps tripping Singapore
• power trip electrician Singapore

Frequency Answer Question

What are the main types of circuit breakers?
The main types commonly discussed in homes are MCB, RCCB, RCBO and MCCB. Each one protects against different electrical faults.

What does an MCB do?
An MCB protects the circuit from overload and short circuit.

What does an RCCB do?
An RCCB helps protect against electric shock by detecting leakage current.

What is the difference between RCCB and RCBO?
RCCB protects against leakage current only, while RCBO protects against leakage current, overload and short circuit.

Which circuit breaker is used in homes?
MCB, RCCB and RCBO are commonly used in Singapore homes, depending on the electrical system setup.If you want, send me the draft screenshots after you paste it in and I’ll check the wording and internal links before you publish.