Skip to content

MCBs - Miniature Circuit Breakers

MCBs (Miniature Circuit Breakers)

What is an MCB?

MCB stands for Miniature Circuit Breaker. 

It's a small device designed to interrupt electrical flow when it detects abnormal conditions such as overload or short circuits. 

Essentially, it acts as a safety switch – protecting your electrical circuits and preventing potential hazards like fire or equipment damage.

How Do MCBs Work?

MCBs work by monitoring the flow of electricity through a circuit. 

When the current exceeds the MCB's rated capacity, or there's a short circuit, it trips - cutting off the power supply and preventing further damage.

Can I Change an MCB Myself?

Yes, MCBs are designed for easy installation and replacement. 

However, you’ll need to follow proper safety procedures and will need the knowledge and skills to handle electrical work safely. 

It's always best to consult a qualified electrician if you're unsure.

What Size MCB for Sockets?

The MCB's size depends on the electrical circuit's rating and the appliances connected to it. 

A 32A or 40A MCB is typically suitable for socket outlets commonly used in homes. 

However, you should consult electrical regulations and guidelines to pick the right size for your specific application.

Can MCBs Be Used for DC?

Yes, MCBs can be used for both AC (alternating current) and DC (direct current) circuits. 

However, you should choose MCBs specifically rated for DC applications to ensure you get the right protection and performance.

What Are the Types of MCB?

Various types of MCBs are available, including Type B, Type C, and Type D, each designed to trip at different levels of overload or short circuit currents.

What is the Tripping Mechanism of an MCB?

The tripping mechanism of an MCB is typically based on either thermal or magnetic principles. 

Thermal MCBs respond to the heat generated by overcurrent, while magnetic MCBs detect sudden surges in current. 

Some MCBs feature both mechanisms for better protection.

Where Are MCBs Installed?

MCBs are installed in electrical distribution boards, consumer units, or fuse boxes to protect individual circuits or groups of circuits within a building. 

They are commonly found in residential, commercial, and industrial settings.

Can I Reset an MCB?

Yes, most MCBs feature a reset function that allows you to restore power to the circuit after it has tripped. 

Simply switch the MCB back to the "on" position after fixing the cause of the trip.

Invest in quality MCBs today to ensure the safety and reliability of your electrical installations. 

Browse our selection of MCBs to find the perfect solution for your needs!

  • Original price £2.10
    Original price £2.10 - Original price £2.10
    Original price £2.10
    £0.42 - £2.10
    £0.42 - £2.10
    Current price £0.42 inc VAT
    £0.35 ex VAT

    Essentials B Curve MCB Single Pole 6KA

    Essentials
    In stock

    Designed to be used in our Essentials consumer units, they are din rail mounted, designed to take a cable size from 1mm to 16mm and have a toggle w...

    View full details
    Original price £2.10
    Original price £2.10 - Original price £2.10
    Original price £2.10
    £0.42 - £2.10
    £0.42 - £2.10
    Current price £0.42 inc VAT
    £0.35 ex VAT
    Save up to 80% Save %
  • Original price £24.23
    Original price £24.23 - Original price £24.23
    Original price £24.23
    Current price £3.08 inc VAT
    £3.08 - £3.08
    Current price £3.08 inc VAT
    £2.57 ex VAT

    Wylex NB06 MCB SP 6A 3Ka

    Wylex
    In stock

    Wylex NB06 MCB SP 6A 3kA • Rated at 6kA

    Original price £24.23
    Original price £24.23 - Original price £24.23
    Original price £24.23
    Current price £3.08 inc VAT
    £3.08 - £3.08
    Current price £3.08 inc VAT
    £2.57 ex VAT
    Save 87% Save %
  • Original price £5.18
    Original price £5.18 - Original price £5.18
    Original price £5.18
    Current price £0.73 inc VAT
    £0.73 - £0.73
    Current price £0.73 inc VAT
    £0.61 ex VAT

    ABB MCB S201MD16 Single Pole Type D 16A 10Ka

    ABB
    In stock

    System Pro M Compact S200M Miniature Circuit Breakers Are Current Limiting. They Have Two Different Tripping Mechanisms, The Delayed Thermal Trippi...

    View full details
    Original price £5.18
    Original price £5.18 - Original price £5.18
    Original price £5.18
    Current price £0.73 inc VAT
    £0.73 - £0.73
    Current price £0.73 inc VAT
    £0.61 ex VAT
    Save 86% Save %
  • Original price £5.99
    Original price £5.99 - Original price £5.99
    Original price £5.99
    Current price £0.69 inc VAT
    £0.69 - £0.69
    Current price £0.69 inc VAT
    £0.58 ex VAT

    ABB MCB S201Md63 Single Pole Type D 63A 10Ka 2CDS271001R0631

    ABB
    In stock

    System Pro M Compact S200M Miniature Circuit Breakers Are Current Limiting. They Have Two Different Tripping Mechanisms, The Delayed Thermal Trippi...

    View full details
    Original price £5.99
    Original price £5.99 - Original price £5.99
    Original price £5.99
    Current price £0.69 inc VAT
    £0.69 - £0.69
    Current price £0.69 inc VAT
    £0.58 ex VAT
    Save 88% Save %
  • Original price £7.79
    Original price £7.79 - Original price £7.79
    Original price £7.79
    Current price £1.69 inc VAT
    £1.69 - £1.69
    Current price £1.69 inc VAT
    £1.41 ex VAT

    ABB MCB 1 Pole C Curve 6A 25Ka 2CDS281001R0064

    ABB
    Out of stock

    ABB 2CDS281001R0064 1 Pole 6A Type C MCB with Failsafe bi-directional cylinder-lift screw terminal. This System pro M compact S201P-C6 MCB is curre...

    View full details
    Original price £7.79
    Original price £7.79 - Original price £7.79
    Original price £7.79
    Current price £1.69 inc VAT
    £1.69 - £1.69
    Current price £1.69 inc VAT
    £1.41 ex VAT
    Sold out
  • Original price £28.25 - Original price £28.25
    Original price
    £28.25 inc VAT
    £28.25 - £28.25
    Current price £28.25 inc VAT
    £23.54 ex VAT

    ABB 2CDS283001R0324 MCB 3 Pole C Curve 32A 15KA

    ABB
    In stock

    System pro M compact S200P miniature circuit breakers are current limiting. They have two different tripping mechanisms, the delayed thermal trippi...

    View full details
    Original price £28.25 - Original price £28.25
    Original price
    £28.25 inc VAT
    £28.25 - £28.25
    Current price £28.25 inc VAT
    £23.54 ex VAT
  • Original price £36.52 - Original price £36.52
    Original price
    £36.52 inc VAT
    £36.52 - £36.52
    Current price £36.52 inc VAT
    £30.43 ex VAT

    Crabtree 50/50 MCB SP Type C 50A 4.5kA

    Crabtree
    In stock

    Original price £36.52 - Original price £36.52
    Original price
    £36.52 inc VAT
    £36.52 - £36.52
    Current price £36.52 inc VAT
    £30.43 ex VAT
  • Original price £20.77
    Original price £20.77 - Original price £20.77
    Original price £20.77
    Current price £6.77 inc VAT
    £6.77 - £6.77
    Current price £6.77 inc VAT
    £5.64 ex VAT

    Dorman Smith K2PC06 MCB K Series Type C DP 6A 10Ka

    Dorman Smith
    Out of stock

    Double Pole MCB

    Original price £20.77
    Original price £20.77 - Original price £20.77
    Original price £20.77
    Current price £6.77 inc VAT
    £6.77 - £6.77
    Current price £6.77 inc VAT
    £5.64 ex VAT
    Sold out
  • Original price £4.74 - Original price £4.74
    Original price
    £4.74 inc VAT
    £4.74 - £4.74
    Current price £4.74 inc VAT
    £3.95 ex VAT

    Eaton AD32B 32A SP MCB Type B 6Ka

    Eaton
    In stock

    Eaton Memera AD32B Miniature Circuit Breaker is a consumer unit device suitable for circuit protection. It complies to BSEN 60898 • To BSEN 60898 ...

    View full details
    Original price £4.74 - Original price £4.74
    Original price
    £4.74 inc VAT
    £4.74 - £4.74
    Current price £4.74 inc VAT
    £3.95 ex VAT
  • Original price £2.33 - Original price £2.33
    Original price
    £2.33 inc VAT
    £2.33 - £2.33
    Current price £2.33 inc VAT
    £1.94 ex VAT

    Legrand 419749 MCB Rx3 Single Pole Type B 6A 6Ka 1 Module

    Legrand
    In stock

    Breaking Capacity: 6000A • Current Rating: 6A • Number of Poles: 1 Pole • Range: Rx3

    Original price £2.33 - Original price £2.33
    Original price
    £2.33 inc VAT
    £2.33 - £2.33
    Current price £2.33 inc VAT
    £1.94 ex VAT
  • Original price £2.35
    Original price £2.35 - Original price £2.35
    Original price £2.35
    Current price £0.49 inc VAT
    £0.49 - £0.49
    Current price £0.49 inc VAT
    £0.41 ex VAT

    Legrand 419758 63A SP Type B 6Ka MCB

    Legrand
    Out of stock

    Breaking Capacity: 6000A • Current Rating: 63A • Number of Poles: 1 Pole • Range: Rx3

    Original price £2.35
    Original price £2.35 - Original price £2.35
    Original price £2.35
    Current price £0.49 inc VAT
    £0.49 - £0.49
    Current price £0.49 inc VAT
    £0.41 ex VAT
    Sold out
  • Original price £33.60 - Original price £33.60
    Original price
    £33.60 inc VAT
    £33.60 - £33.60
    Current price £33.60 inc VAT
    £28.00 ex VAT

    Eaton MCB DP Type D 20A 10/15Ka

    Eaton
    In stock

    EM miniature circuit-breaker, 2 pole, trip type: D, rated operational current In: 20 A, rated switching capacity according to IEC/EN 60947-2: 15 kA...

    View full details
    Original price £33.60 - Original price £33.60
    Original price
    £33.60 inc VAT
    £33.60 - £33.60
    Current price £33.60 inc VAT
    £28.00 ex VAT
  • Original price £0.00 - Original price £0.00
    Original price £0.00
    £18.88 inc VAT
    £18.88 - £18.88
    Current price £18.88 inc VAT
    £15.73 ex VAT

    ABB MCB Triple Pole Compact Type C 10A 6Ka 2CDS253001R0104

    ABB
    Low stock

    ABB 2CDS253001R0104 3 Pole 10A Type C MCB with Failsafe bi-directional cylinder-lift screw terminal. This System pro M compact S203-C10 MCB is curr...

    View full details
    Original price £0.00 - Original price £0.00
    Original price £0.00
    £18.88 inc VAT
    £18.88 - £18.88
    Current price £18.88 inc VAT
    £15.73 ex VAT
  • Original price £48.30
    Original price £48.30 - Original price £48.30
    Original price £48.30
    Current price £10.28 inc VAT
    £10.28 - £10.28
    Current price £10.28 inc VAT
    £8.57 ex VAT

    Schneider A9F45210 Acti9 iC60N 2p 10A D MCB Miniature Circuit Breaker

    Schneider Electric
    Low stock

    ACTI9 IC60N 2P 10A D MCB • This Acti9 iC60N is a low voltage miniature circuit breaker (MCB). • It is a 2P circuit breaker with 2 protected poles...

    View full details
    Original price £48.30
    Original price £48.30 - Original price £48.30
    Original price £48.30
    Current price £10.28 inc VAT
    £10.28 - £10.28
    Current price £10.28 inc VAT
    £8.57 ex VAT
    Save 79% Save %
  • Original price £11.48
    Original price £11.48 - Original price £11.48
    Original price £11.48
    Current price £2.76 inc VAT
    £2.76 - £2.76
    Current price £2.76 inc VAT
    £2.30 ex VAT

    Schneider C60HC120 Multi 9 Miniature Circuit Breaker 1-Pole 20A Curve C 15kA

    Schneider
    Out of stock

    Original price £11.48
    Original price £11.48 - Original price £11.48
    Original price £11.48
    Current price £2.76 inc VAT
    £2.76 - £2.76
    Current price £2.76 inc VAT
    £2.30 ex VAT
    Sold out
  • Original price £14.39
    Original price £14.39 - Original price £14.39
    Original price £14.39
    Current price £2.90 inc VAT
    £2.90 - £2.90
    Current price £2.90 inc VAT
    £2.42 ex VAT

    Siemens 5SY4116-5 Miniature Circuit Breaker 230/400 V 10kA, 1-Pole, A, 16A, D=70 Mm

    Siemens
    Out of stock

    Miniature circuit breaker 230/400 V 10kA, 1-pole, A, 16A, D=70 mm The miniature circuit breaker is the fuse for short-circuit protection. The minia...

    View full details
    Original price £14.39
    Original price £14.39 - Original price £14.39
    Original price £14.39
    Current price £2.90 inc VAT
    £2.90 - £2.90
    Current price £2.90 inc VAT
    £2.42 ex VAT
    Sold out
  • Original price £10.92
    Original price £10.92 - Original price £10.92
    Original price £10.92
    Current price £2.42 inc VAT
    £2.42 - £2.42
    Current price £2.42 inc VAT
    £2.02 ex VAT

    Wylex NSB310-C MCB TP Type C 10A 6kA

    Wylex
    Out of stock

    Original price £10.92
    Original price £10.92 - Original price £10.92
    Original price £10.92
    Current price £2.42 inc VAT
    £2.42 - £2.42
    Current price £2.42 inc VAT
    £2.02 ex VAT
    Sold out
  • Original price £91.91
    Original price £91.91 - Original price £91.91
    Original price £91.91
    Current price £35.36 inc VAT
    £35.36 - £35.36
    Current price £35.36 inc VAT
    £29.47 ex VAT

    Schneider A9F53410 Merlin Gerin Acti9 IC60H 4 Pole 10A B MCB Miniature Circuit Breaker

    Schneider Electric
    In stock

    This Acti9 iC60H is a multistandard low voltage miniature circuit breaker (MCB) with double tunnel terminals. It is a 4P circuit breaker with 4 pro...

    View full details
    Original price £91.91
    Original price £91.91 - Original price £91.91
    Original price £91.91
    Current price £35.36 inc VAT
    £35.36 - £35.36
    Current price £35.36 inc VAT
    £29.47 ex VAT
    Save 62% Save %
  • Original price £20.17
    Original price £20.17 - Original price £20.17
    Original price £20.17
    Current price £4.25 inc VAT
    £4.25 - £4.25
    Current price £4.25 inc VAT
    £3.54 ex VAT

    Schneider A9N21554 Clario iDPN 1-Pole 3A 6/10kA Curve-C Miniature Circuit Breaker 18 x 81 x 78mm

    Schneider Electric
    Out of stock

    This Clario iDPN N product is a low voltage miniature circuit breaker (MCB). It is a 1P+N circuit breaker with 1 protected pole and 3A In rated cur...

    View full details
    Original price £20.17
    Original price £20.17 - Original price £20.17
    Original price £20.17
    Current price £4.25 inc VAT
    £4.25 - £4.25
    Current price £4.25 inc VAT
    £3.54 ex VAT
    Sold out
  • Original price £8.93
    Original price £8.93 - Original price £8.93
    Original price £8.93
    Current price £1.05 inc VAT
    £1.05 - £1.05
    Current price £1.05 inc VAT
    £0.88 ex VAT

    Schneider C60HB110 MCB C60H SP Type B 10A 15KA

    Schneider Electric
    Out of stock

    Original price £8.93
    Original price £8.93 - Original price £8.93
    Original price £8.93
    Current price £1.05 inc VAT
    £1.05 - £1.05
    Current price £1.05 inc VAT
    £0.88 ex VAT
    Sold out
  • Original price £83.28
    Original price £83.28 - Original price £83.28
    Original price £83.28
    Current price £18.10 inc VAT
    £18.10 - £18.10
    Current price £18.10 inc VAT
    £15.08 ex VAT

    ABB 2CCS882001R0801 MCB Double Pole Type D 80A S802C-D80

    ABB
    In stock

    The S802C-D80 is a 2-pole High Performance Circuit breaker with D-Characteristic, with cage terminal and a rated current of 80 A. It is a current l...

    View full details
    Original price £83.28
    Original price £83.28 - Original price £83.28
    Original price £83.28
    Current price £18.10 inc VAT
    £18.10 - £18.10
    Current price £18.10 inc VAT
    £15.08 ex VAT
    Save 78% Save %
  • Original price £15.54
    Original price £15.54 - Original price £15.54
    Original price £15.54
    Current price £2.23 inc VAT
    £2.23 - £2.23
    Current price £2.23 inc VAT
    £1.86 ex VAT

    Legrand IAB410A Module Protection 6A MCB 16A

    Legrand
    In stock

    Original price £15.54
    Original price £15.54 - Original price £15.54
    Original price £15.54
    Current price £2.23 inc VAT
    £2.23 - £2.23
    Current price £2.23 inc VAT
    £1.86 ex VAT
    Save 86% Save %
  • Original price £1.65 - Original price £1.65
    Original price
    £1.65 inc VAT
    £1.65 - £1.65
    Current price £1.65 inc VAT
    £1.38 ex VAT

    Legrand 402272 16A SP Type B 6KA MCB

    Legrand
    Low stock

    Original price £1.65 - Original price £1.65
    Original price
    £1.65 inc VAT
    £1.65 - £1.65
    Current price £1.65 inc VAT
    £1.38 ex VAT
  • Original price £2.33 - Original price £2.33
    Original price
    £2.33 inc VAT
    £2.33 - £2.33
    Current price £2.33 inc VAT
    £1.94 ex VAT

    Legrand 419752 MCB Rx3 Single Pole Type B 16A 6Ka 1 Module

    Legrand
    In stock

    Legrand RX3 Residential DIN Rail Miniature Circuit Breaker has a rated short circuit capacity of 6kA and type-B trip curve characteristics.. • BS ...

    View full details
    Original price £2.33 - Original price £2.33
    Original price
    £2.33 inc VAT
    £2.33 - £2.33
    Current price £2.33 inc VAT
    £1.94 ex VAT

MCBs (Miniature Circuit Breakers)

What is an MCB?

MCB stands for Miniature Circuit Breaker. 

It's a small device designed to interrupt electrical flow when it detects abnormal conditions such as overload or short circuits. 

Essentially, it acts as a safety switch – protecting your electrical circuits and preventing potential hazards like fire or equipment damage.

How Do MCBs Work?

MCBs work by monitoring the flow of electricity through a circuit. 

When the current exceeds the MCB's rated capacity, or there's a short circuit, it trips - cutting off the power supply and preventing further damage.

Can I Change an MCB Myself?

Yes, MCBs are designed for easy installation and replacement. 

However, you’ll need to follow proper safety procedures and will need the knowledge and skills to handle electrical work safely. 

It's always best to consult a qualified electrician if you're unsure.

What Size MCB for Sockets?

The MCB's size depends on the electrical circuit's rating and the appliances connected to it. 

A 32A or 40A MCB is typically suitable for socket outlets commonly used in homes. 

However, you should consult electrical regulations and guidelines to pick the right size for your specific application.

Can MCBs Be Used for DC?

Yes, MCBs can be used for both AC (alternating current) and DC (direct current) circuits. 

However, you should choose MCBs specifically rated for DC applications to ensure you get the right protection and performance.

What Are the Types of MCB?

Various types of MCBs are available, including Type B, Type C, and Type D, each designed to trip at different levels of overload or short circuit currents.

What is the Tripping Mechanism of an MCB?

The tripping mechanism of an MCB is typically based on either thermal or magnetic principles. 

Thermal MCBs respond to the heat generated by overcurrent, while magnetic MCBs detect sudden surges in current. 

Some MCBs feature both mechanisms for better protection.

Where Are MCBs Installed?

MCBs are installed in electrical distribution boards, consumer units, or fuse boxes to protect individual circuits or groups of circuits within a building. 

They are commonly found in residential, commercial, and industrial settings.

Can I Reset an MCB?

Yes, most MCBs feature a reset function that allows you to restore power to the circuit after it has tripped. 

Simply switch the MCB back to the "on" position after fixing the cause of the trip.

Invest in quality MCBs today to ensure the safety and reliability of your electrical installations. 

Browse our selection of MCBs to find the perfect solution for your needs!

Free Shipping

When you spend £50

1000s products in stock

Order by 2pm for next working day delivery*

Secure Payment

Google Pay, Apple Pay, Paypal

Great Deals

Special Offers