MCB vs RCCB: What’s the Difference & Why It Matters for Your Home Electrical System in 2026

Table of Contents

• Introduction

• What is an MCB?

• What is an RCCB?

• Key Differences Between MCB and RCCB

• Why Both Are Crucial for Home Safety

• Real-Life Home Scenarios

• Did You Know?

• Conclusion

• Frequently Asked Questions (FAQ)

• Cheapest Home Electrical Contractor – From Only RM80!

Introduction

What’s the difference between an MCB and an RCCB in your home wiring system?

Many homeowners in Malaysia are still unsure about the exact roles of MCBs and RCCBs. This article will help you understand their differences, importance, and when you should ensure both are installed in your home..

What is an MCB?

MCB: Miniature Circuit Breaker – Protects Circuits from Overload

An MCB (Miniature Circuit Breaker) functions to:

• Protect electrical circuits from overloads or short circuits

• Automatically cut power in case of faults

• Prevent fire risks due to overheating wires

Commonly used for:

• Ceiling fans

• Lighting

• Plug sockets

What is an RCCB?

RCCB: Residual Current Circuit Breaker – Protects People from Electric Shock

An RCCB functions to:

• Detect current leakage when someone is electrocuted

• Instantly cut off power to prevent electric shocks

• Provide additional human protection, not just for appliances

Especially used for:

• Water heaters

• High-powered electrical appliances

• Damp areas like bathrooms

Key Differences Between MCB and RCCB

Feature	MCB	RCCB
Main Function	Protects circuit from overload	Protects people from electric shock
Type of Fault	Overload & short circuit	Current leakage
Protection For	Equipment and wiring	Human safety
Usage Frequency	All circuits	Specific circuits (e.g., bathrooms)

Why Both Are Crucial for Home Safety

Modern Home Wiring Requires Both for Full Protection

According to the Energy Commission of Malaysia, many home electrical accidents are caused by:

• Outdated or poorly maintained wiring

• Lack of RCCB installation

• Faulty or misfunctioning MCBs

MCB + RCCB = Total Protection

• MCB prevents electrical fires

• RCCB protects lives

Real-Life Home Scenarios

How MCB & RCCB Can Save Your Home

Scenario 1: Your child inserts a metal object into a socket — RCCB will instantly cut off the current.

Scenario 2: A faulty water heater leaks current — RCCB prevents fatal shocks.

Scenario 3: An old fan draws excessive current — MCB disconnects the supply to prevent overheating.

Did You Know? Extra Safety Facts for Your Home

• The Ministry of Energy recommends checking your home wiring every 10 years.

• RCCB installation has been mandatory in all new Malaysian homes since 2018.

• Many older homes still don’t have RCCBs — upgrade now for better safety!

Conclusion

MCBs and RCCBs are both essential components of your home’s electrical system. For maximum protection:

• Ensure both are installed by licensed electrical contractors.

• Avoid fire risks and electric shock with a safe, modern wiring setup.

👉 Don’t wait for an accident to happen — take action today!

Frequently Asked Questions (FAQ)

1. Do I need both MCB and RCCB at home?

Yes. MCB protects equipment, RCCB protects people. The combination is critical.

2. When should I check or replace my home electrical system?

Every 10 years, or if you notice warning signs like:

• Frequent power trips

• Burning smells from plugs

• Warm switches

  
  

3. How much does it cost to install an RCCB or MCB?

Prices depend on your house type and existing system. Usually RM150–RM300.

4. Does RCCB work for all types of appliances?

RCCB is most effective for high-power appliances and in damp areas like bathrooms.

5. How do I know if an electrician is licensed?

Make sure they are registered with the Energy Commission and have a PW4 wiring license.

Cheapest Home Electrical Contractor – From Only RM80!

🚀 Limited Time Offer – On-Site Within 4 Hours!

We provide the most affordable home electrical wiring and installation services in Malaysia:

🔧 Our Services Include:

• Lighting, fan, socket, water heater, aircond, auto gate, doorbell & more

• DB board installation & electrical grounding (earthing)

• Fast installation (as quick as 15 minutes for basic jobs)

💡 Our Budget Packages:

• Light/Downlight Installation – From RM60 (others charge RM90!)

• Fan/Water Heater Installation – From RM120 (save RM30!)

• Water Heater + Wiring – From RM150 (RM20 cheaper than market price!)

🛠️ All work done by certified & licensed contractors. High-quality materials, neat & fast workmanship.

📲 Book Now!

Click to WhatsApp Us Now ✅

Get a FREE Quote in 5 minutes 📩

Don’t miss out – Limited Offer, First Come First Serve! 🔥