MCB & DB's

MCB & DB's - Buy Schneider Electric & Legrand MCB Switch, Distribution Boards & Circuit Breakers Online

The MCB and distribution board are the safety heart of a home electrical system. When a circuit overloads or a fault occurs, it is the MCB that trips and cuts the power in an instant, preventing overheating, fire and electric shock. The distribution board, or DB, is the organised hub that houses these protective switches and splits the incoming supply into safe, controllable circuits. At Fixxly, our MCB and DBs range is built on Schneider Electric and Legrand - MCBs (miniature circuit breakers), RCCBs, isolators and the distribution boards that hold them. This guide explains what an MCB switch does, how a DB is planned, and how to protect a home correctly.

What is an MCB and how does an MCB switch work?

An MCB, or miniature circuit breaker, is an automatic switch that protects an electrical circuit from damage caused by overload or short circuit. In normal use it acts as a simple on-off switch for the circuit, which is why it is often searched as an MCB switch. But its real job is protective: if the current exceeds the safe limit, the MCB trips instantly, breaking the circuit and stopping the flow of electricity before wires overheat. Fixxly stocks genuine Schneider Electric and Legrand MCBs, two of the most trusted names in circuit protection worldwide. Unlike an old-fashioned fuse, which has to be replaced after it blows, an MCB can simply be reset once the problem is cleared.

Types of protective devices in a distribution board

MCB (Miniature Circuit Breaker)

The MCB protects against overload and short circuit and is the workhorse of the DB, with one MCB typically assigned to each circuit. Both Schneider Electric and Legrand MCBs come in different current ratings and tripping characteristics matched to the load they protect.

RCCB (Residual Current Circuit Breaker)

An RCCB protects against earth leakage and electric shock by detecting the tiny current imbalance that occurs when electricity leaks to earth. It trips fast enough to prevent a fatal shock, which is why an RCCB is a critical safety device in modern homes, especially for socket and wet-area circuits.

Isolator and main switch

The isolator or main switch lets you disconnect the entire board safely for maintenance, cutting all power downstream in one action.

What is a distribution board (DB)?

A distribution board is the enclosure that receives the main incoming supply and distributes it into separate circuits, each protected by its own MCB. Schneider Electric and Legrand both offer DBs in different sizes, described by the number of ways (modules) they can hold, so the board is chosen to fit the number of circuits plus room to spare for future additions.

How to plan MCB and DB protection for a home

• Assign one MCB per circuit, rated to the load - lighting circuits, socket circuits, and dedicated circuits for heavy appliances like air conditioners, geysers and ovens.
• Include an RCCB to protect socket and wet-area circuits against earth leakage and shock - this is a life-safety device, not an optional extra.
• Choose a Schneider Electric or Legrand DB with enough ways for all circuits plus spare modules for future needs.
• Use a main isolator so the whole board can be safely switched off for maintenance.
• Match every MCB rating to the wire and load it protects.

Why Fixxly for MCB and DBs

Fixxly is a single platform for an entire renovation, and MCBs and DBs are one part of an electrical range that sits within ten full categories covering every trade a home touches. Every MCB, RCCB and DB in this range is genuine Schneider Electric or Legrand: on Fixxly you can buy them together with the wires, conduit and switches they protect, all in one order, delivered in 30 minutes.

	Fixxly	Others
Brand assurance	Genuine Schneider Electric and Legrand, verified material	Authenticity harder to verify -- a real risk for a safety device
Delivery speed	30-minute quick delivery	Same-day if in stock locally, otherwise 1-5 days
Complete protection system in one order	MCBs, RCCB, isolator and distribution board together	Usually needs multiple shops or sellers to gather a matched set
Returns on a bad unit	Straightforward replacement policy	Policies vary, and can be slow for small parts

Why correct circuit protection matters

The MCB and DB are not where anyone should economise. They are the devices that stand between a normal fault and a fire or a fatal shock. Correctly rated Schneider Electric or Legrand MCBs, a properly specified RCCB and a well-organised DB together ensure that every fault is caught instantly and safely.

Frequently asked questions about MCB and DBs

Does Fixxly stock genuine Schneider Electric and Legrand products?

Yes - every MCB, RCCB, isolator and distribution board on Fixxly in this range is genuine Schneider Electric or Legrand, two of the world's most established names in electrical protection. For a safety device, buying verified genuine stock matters more than almost any other electrical purchase.

What is the difference between an MCB and a fuse?

An MCB is an automatic switch that trips to break a circuit during overload or short circuit and can be reset once the fault is cleared, while a fuse has to be replaced after it blows. MCBs are safer, faster and more convenient.

What does an RCCB protect against?

An RCCB protects against earth leakage and electric shock by detecting the small current imbalance that occurs when electricity leaks to earth, then tripping fast enough to prevent a dangerous shock.

How many ways should my distribution board have?

The DB should have enough ways for all your circuits plus a few spare modules for future additions. Schneider Electric and Legrand both offer boards in a range of sizes to match.

Explore other categories

Protection is one part of a finished electrical system, and Fixxly stocks every category around it. Build the circuits with wires and cables, conduit, boxes and fittings and switches, sockets and plates, and stock electrical consumables and accessories. Light and cool the home with LED bulbs and ceiling fans and exhaust. For the wider project, browse interior paints, CPVC pipes and fittings and hand tools. Everything a home needs is a click away on Fixxly.