Circuit Breakers

Circuit Breakers Singapore – MCB, MCCB & RCCB Breakers

Shop circuit breakers in Singapore at Horme Hardware for residential, commercial, and industrial electrical installations. Compare MCB breakers, MCCB breakers, and RCCB breakers by protection function, current rating, pole configuration, and product specifications.

Whether you need a circuit breaker for a home distribution board or a larger electrical panel, check each product listing for pricing and availability. MCBs and MCCBs protect against overloads and short circuits, while RCCBs provide earth leakage protection and require separate overcurrent protection.

Buy Circuit Breakers in Singapore

A circuit breaker automatically interrupts the electricity supply when it detects the fault conditions it is designed to protect against. Unlike a fuse, which requires replacement after operating, a circuit breaker can generally be reset once the fault has been identified and resolved.

Circuit breakers are commonly used in:
• HDB flats, condominiums, and landed homes
• Commercial offices and retail spaces
• Industrial plants and factories
• Electrical distribution boards and panels
• Electrical maintenance, upgrades, and renovation projects

Browse the available products to compare circuit breaker prices, specifications, and suitability for your installation. Confirm the required protection and compatibility before ordering.

Electrical Breakers for Safe Power Distribution

An electrical breaker is another common term for a circuit breaker. Its protection function depends on the device: an MCB or MCCB typically responds to overloads and short circuits, while an RCCB responds to residual current caused by earth leakage.

Correctly selected electrical breakers help:
• Protect circuit wiring against overcurrent
• Reduce the risk of electrical fires
• Isolate faulty circuits
• Support safer operation and maintenance

The protection provided depends on the breaker specification, installation design, and coordination with other protective devices.

MCB Breakers – Miniature Circuit Breakers for Homes & Offices

An MCB breaker, or miniature circuit breaker, protects electrical circuits against overloads and short circuits. MCBs are commonly used for final circuits in homes, offices, and retail premises.

MCBs are commonly used for:
• Residential lighting circuits
• Power socket circuits
• Office and shop electrical circuits
• Outgoing circuits in distribution boards

When selecting an MCB circuit breaker, check its rated current, number of poles, tripping curve, breaking capacity, and compatibility with the distribution board. An MCB does not provide earth leakage protection on its own.

MCCB Breakers Singapore – Moulded Case Circuit Breakers

An MCCB breaker, or moulded case circuit breaker, provides overcurrent protection for distribution circuits and is commonly used in commercial and industrial installations. Depending on the model, an MCCB may offer adjustable protection settings.

MCCBs are commonly used for:
• Industrial distribution systems
• Commercial buildings with substantial electrical loads
• Main incomer and sub-distribution circuits
• Machinery supply circuits with coordinated protection

Compare MCCB options by rated current, breaking capacity, pole configuration, and trip unit specifications. MCCB prices vary by model and specification. Check the individual product listing for current pricing and availability, and have a Licensed Electrical Worker confirm suitability for your installation.

RCCB Breakers Singapore – Earth Leakage Protection

An RCCB breaker, or residual current circuit breaker, disconnects the electricity supply when it detects residual current above its operating threshold. RCCBs help reduce electric shock risk in homes and other electrical installations.

RCCBs are used in:
• Residential distribution boards
• Installations supplying kitchens and bathrooms
• Commercial electrical systems
• Circuits requiring residual current protection

When comparing RCCB breakers in Singapore, check the rated current, residual operating current, device type, and number of poles. An RCCB does not protect against overloads or short circuits and must be coordinated with suitable overcurrent protection, such as an MCB or fuse.

Circuit Breakers for Distribution Boards & Panels

Circuit breakers help protect and isolate circuits within distribution boards and electrical panels. The appropriate arrangement depends on the supply, connected loads, and protection requirements.

Common applications include:
• Main and sub-distribution boards
• Electrical control panels
• Commercial building power systems
• Industrial electrical installations

A distribution board may use MCBs with an RCCB, while larger systems may also use MCCBs upstream. These devices must be selected and coordinated for the specific installation.

How to Choose the Right Circuit Breaker

Choosing a suitable circuit breaker involves more than matching its current rating. Key considerations include:
• Required protection: overload, short circuit, or earth leakage
• Load demand and cable current-carrying capacity
• Supply voltage and number of poles
• Breaking capacity and prospective fault current
• Tripping characteristics or adjustable protection settings
• Distribution board compatibility and installation conditions

MCBs commonly protect final circuits, MCCBs serve larger distribution loads, and RCCBs provide residual current protection. Ask a Licensed Electrical Worker to confirm the correct device and installation requirements.

Circuit Breakers in Singapore Electrical Systems

Circuit protection is used across Singapore properties, from individual homes to commercial and industrial buildings. Device selection should reflect the installation’s electrical design and applicable local requirements.

Common local applications include:
• HDB flats and condominiums
• Offices and shopping centres
• Factories and warehouses
• Electrical upgrades and distribution board replacements

Replacing a breaker requires checking the existing wiring, fault levels, and board compatibility. A higher current rating is not automatically a suitable upgrade.

Installation & Maintenance Considerations

Engage a Licensed Electrical Worker (LEW) for circuit breaker installation, replacement, and work on fixed electrical installations.

Key considerations include:
• Correct device ratings and protection coordination
• Compatibility with the distribution board and connections
• Inspection and testing after installation
• RCCB testing according to official guidance and manufacturer instructions
• Investigation of repeated tripping or signs of damage

If a breaker trips repeatedly, arrange an inspection to identify the cause before restoring normal operation. Routine inspection and appropriate testing help maintain reliable circuit protection.

Benefits of Using the Right Electrical Breakers

Properly selected and installed circuit protection can provide:
• Protection against the specific faults each device detects
• Reduced risk of wiring damage and electrical fires
• Improved isolation of faulty circuits
• More reliable power distribution

Effective electrical protection depends on suitable devices, correct installation, and ongoing maintenance.

Why Buy Circuit Breakers from Horme Hardware

Shop for circuit breakers at Horme Hardware Singapore and compare available options for electrical maintenance, replacement, and installation projects.

Use the product listings to:
• Compare breaker types and specifications
• Check suitability for residential, commercial, or industrial applications
• Review options for distribution boards and electrical panels
• Confirm current pricing, availability, and delivery information

Explore circuit breaker products from Schneider Electric and ABB. Check each listing for the exact model, technical specifications, and availability before ordering.

Horme Hardware also offers electrical accessories and installation tools for related project requirements.

Note: All residential premises in Singapore must have an RCCB or Earth Leakage Circuit Breaker (ELCB) with a rated residual operating current not exceeding 30mA. From 1 July 2025, homeowners without an RCCB or ELCB may face a fine of up to S$5,000. Refer to the Energy Market Authority’s RCCB requirements for current guidance, and engage a Licensed Electrical Worker if installation is required. Contact HDB directly to confirm any applicable installation assistance and eligibility.

Frequently Asked Questions About Circuit Breakers

What is the difference between a circuit breaker and an electrical breaker?
The terms are commonly used interchangeably. The important distinction is the device’s protection function, such as overcurrent protection or residual current protection.

What is the difference between MCB, MCCB and RCCB breakers?
MCBs protect against overloads and short circuits, commonly in final circuits. MCCBs also provide overcurrent protection and are commonly used for larger distribution loads. RCCBs detect earth leakage and require separate overcurrent protection.

Which circuit breaker is suitable for homes?
Homes commonly use MCBs for individual circuits together with an RCCB for residual current protection. Some installations use RCBOs, which combine residual current and overcurrent protection. A Licensed Electrical Worker should confirm the appropriate arrangement.

Are MCCB breakers used in residential buildings?
MCCBs may be used in the main distribution systems of larger residential buildings. Individual homes commonly use MCBs for final circuits, with suitable residual current protection.

Why is an RCCB important for safety?
An RCCB disconnects the supply when it detects residual current above its operating threshold, helping reduce electric shock risk. It does not replace overload or short-circuit protection.

How much does a circuit breaker cost in Singapore?
Circuit breaker prices depend on the brand, breaker type, current rating, number of poles, breaking capacity, and other specifications. Check the relevant Horme Hardware product listing for current pricing. Installation charges are separate from the product price.

Can I replace a circuit breaker myself?
Engage a Licensed Electrical Worker to assess the fault, select a compatible replacement, and carry out the installation and testing.