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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 £10.39 - Original price £10.39
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    £10.39 - £10.39
    Current price £10.39 inc VAT
    £8.66 ex VAT

    Eaton FAZ-D6/1 MCB Y7-278578 SP Type D 6A 10Ka

    Miniature circuit breaker (MCB) FAZ, 1 pole, Tripping characteristic: D, Rated current In: 6 A, Switchgear for industrial and advanced commercial a...

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    Original price £10.39 - Original price £10.39
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    £10.39 inc VAT
    £10.39 - £10.39
    Current price £10.39 inc VAT
    £8.66 ex VAT
  • Original price £3.81 - Original price £3.81
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    £3.81 inc VAT
    £3.81 - £3.81
    Current price £3.81 inc VAT
    £3.18 ex VAT

    Eaton MBH113 MCB SP Type B 13A 10Ka

    MBH113 • Complete and configurable enclosures MCBs, MCCBs, ACBs

    Original price £3.81 - Original price £3.81
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    Current price £3.81 inc VAT
    £3.18 ex VAT
  • Original price £4.37 - Original price £4.37
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    £4.37 - £4.37
    Current price £4.37 inc VAT
    £3.64 ex VAT

    Hager NCN150N MCB 1P 10kA C-50A 1M

    Original price £4.37 - Original price £4.37
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    £3.64 ex VAT
  • Original price £7.37 - Original price £7.37
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    £7.37 - £7.37
    Current price £7.37 inc VAT
    £6.14 ex VAT

    Hager NCN163N MCB 1P 10kA C-63A 1M

    Original price £7.37 - Original price £7.37
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    £7.37 - £7.37
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    £6.14 ex VAT
  • Original price £19.16 - Original price £19.16
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    £19.16 - £19.16
    Current price £19.16 inc VAT
    £15.97 ex VAT

    Wylex NSB06 MCB SP Type B 6A 6Ka 1 Module

    Wylex NS Miniature Circuit Breaker is the thermal-magnetic current limiting type, having a compact construction which has been achieved by not only...

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    Original price £19.16 - Original price £19.16
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    £19.16 - £19.16
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    £15.97 ex VAT
  • Original price £9.07 - Original price £9.07
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    £9.07 inc VAT
    £9.07 - £9.07
    Current price £9.07 inc VAT
    £7.56 ex VAT

    Siemens 5SY4140-6 MCB SP Type B 40A 10Ka

    Miniature circuit breaker 230/400 V 10kA, 1-pole, B, 40A, D=70 mm The miniature circuit breaker is the fuse for short-circuit protection. The minia...

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    Original price £9.07 - Original price £9.07
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    £9.07 inc VAT
    £9.07 - £9.07
    Current price £9.07 inc VAT
    £7.56 ex VAT
  • Original price £11.23 - Original price £11.23
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    £11.23 inc VAT
    £11.23 - £11.23
    Current price £11.23 inc VAT
    £9.36 ex VAT

    Siemens 5SY7132-6 MCB SP Type B 32A 16Ka

    Siemens - Modular Instl Devices 5SY7132-6 Stratum MCB SP Type B 32A 16kA • EAN - 4001869190495 • UPC - Not available • Commodity Code - 85362010 • ...

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    Original price £11.23 - Original price £11.23
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    Current price £11.23 inc VAT
    £9.36 ex VAT
  • Original price £5.62 - Original price £5.62
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    £5.62 - £5.62
    Current price £5.62 inc VAT
    £4.68 ex VAT

    ABB S201P-B16 MCB 1 Pole B Curve 16A 25kA (2CDS281001R0165)

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

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    Original price £5.62 - Original price £5.62
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    Current price £5.62 inc VAT
    £4.68 ex VAT
  • Original price £25.99 - Original price £25.99
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    Current price £25.99 inc VAT
    £21.66 ex VAT

    ABB S203P-C20 MCB 3 Pole C Curve 20A 25kA (2CDS283001R0204)

    ABB 2CDS283001R0204 3 Pole 20A Type C MCB with Failsafe bi-directional cylinder-lift screw terminal. This System pro M compact S203P-C20 MCB is cur...

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    Original price £25.99 - Original price £25.99
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    Current price £25.99 inc VAT
    £21.66 ex VAT
  • Original price £3.68 - Original price £3.68
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    £3.68 - £3.68
    Current price £3.68 inc VAT
    £3.07 ex VAT

    Crabtree 6HS06D MCB D6 10kA 1P Type D 6A (1 Module Width)

    This Miniature Circuit Breaker, is a thermal-magnetic current limiting type, having a compact construction which has been achieved by not only mini...

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    Original price £3.68 - Original price £3.68
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    £3.68 - £3.68
    Current price £3.68 inc VAT
    £3.07 ex VAT
  • Original price £4.86 - Original price £4.86
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    £4.05 ex VAT

    Dorman Smith X1PB06 MCB SP 6A Type B

    Conforms to EN 60898 • 10kA rated breaking capacity • Contact position indicator • 35mm2 cable capacity

    Original price £4.86 - Original price £4.86
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    £4.05 ex VAT
  • Original price £2.02 - Original price £2.02
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    £1.68 ex VAT

    Eaton EAD20B MCB Single Pole Type B 20A Grey

    Miniature circuit breaker (MCB) • DIN rail mountable • Toggle position for positive contact indication • Selectivity Class 3 • Calibration temperat...

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    Original price £2.02 - Original price £2.02
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    Current price £2.02 inc VAT
    £1.68 ex VAT
  • Original price £10.81 - Original price £10.81
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    Current price £10.81 inc VAT
    £9.01 ex VAT

    Eaton PLSM-C6/3-DW MCB PLSM 6A 15kA 3 Pole

    Eaton PLSM-C6/3-DW 3 Pole 6A Type C MCB featuring a guide for secure terminal connection, and compatible with standard busbar which can be position...

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    Original price £10.81 - Original price £10.81
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    Current price £10.81 inc VAT
    £9.01 ex VAT
  • Original price £29.06 - Original price £29.06
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    £24.22 ex VAT

    Eaton 239097 MCB 2A 2 Pole Type C 6Ka

    This is a 2-ampere, 2-pole, C-type miniature circuit breaker (MCB). It has a 230-400V AC voltage rating and a 6kA interrupting rating. Part of Eato...

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    Original price £29.06 - Original price £29.06
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    Current price £29.06 inc VAT
    £24.22 ex VAT
  • Original price £3.90 - Original price £3.90
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    £3.90 - £3.90
    Current price £3.90 inc VAT
    £3.25 ex VAT

    GE EP61B25 MCB 25A 6kA Type B 1 Pole

    Original price £3.90 - Original price £3.90
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    £3.90 - £3.90
    Current price £3.90 inc VAT
    £3.25 ex VAT
  • Original price £24.06 - Original price £24.06
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    £20.05 ex VAT

    GE EP102UCC02 MCB 2 Pole Type C 2A 10kA

    Original price £24.06 - Original price £24.06
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    £24.06 - £24.06
    Current price £24.06 inc VAT
    £20.05 ex VAT
  • Original price £81.02 - Original price £81.02
    Original price
    £81.02 inc VAT
    £81.02 - £81.02
    Current price £81.02 inc VAT
    £67.52 ex VAT

    Hager HMF290T MCB DP Type C 100A 10KA 3 Module

    Original price £81.02 - Original price £81.02
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    £81.02 inc VAT
    £81.02 - £81.02
    Current price £81.02 inc VAT
    £67.52 ex VAT
  • Original price £2.33 - Original price £2.33
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    £2.33 - £2.33
    Current price £2.33 inc VAT
    £1.94 ex VAT

    Legrand 419750 MCB RX3 SP Type B 10A 6KA 1 Module

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

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    Original price £2.33 - Original price £2.33
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    £2.33 inc VAT
    £2.33 - £2.33
    Current price £2.33 inc VAT
    £1.94 ex VAT
  • Original price £13.12 - Original price £13.12
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    £13.12 inc VAT
    £13.12 - £13.12
    Current price £13.12 inc VAT
    £10.93 ex VAT

    Lewden E10-2D32 MCB DP Type D 32A 10kA

    Miniature Circuit Breakers are for installation into Lewden's range of commercial and industrial TP&N Industrial Board range providing protecti...

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    Original price £13.12 - Original price £13.12
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    £13.12 inc VAT
    £13.12 - £13.12
    Current price £13.12 inc VAT
    £10.93 ex VAT
    Sold out
  • Original price £1.29 - Original price £1.29
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    £1.29 inc VAT
    £1.29 - £1.29
    Current price £1.29 inc VAT
    £1.08 ex VAT

    MK Electric H5940S Sentry 1-Pole 40A Curve-B MCB 6kA 17.5 x 83 x 73mm

    This is a Miniature Circuit Breaker, thermo -magnetic, current limiting type and are available with Type B operating characteristics. MCB operating...

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    Original price £1.29 - Original price £1.29
    Original price
    £1.29 inc VAT
    £1.29 - £1.29
    Current price £1.29 inc VAT
    £1.08 ex VAT
    Sold out
  • Original price £2.71 - Original price £2.71
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    £2.71 inc VAT
    £2.71 - £2.71
    Current price £2.71 inc VAT
    £2.26 ex VAT

    Protek HDMCB-1B20 MCB Type B SP 1 Module 20A 10KA 18mm

    Original price £2.71 - Original price £2.71
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    £2.71 inc VAT
    £2.71 - £2.71
    Current price £2.71 inc VAT
    £2.26 ex VAT
  • Original price £67.85 - Original price £67.85
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    £67.85 - £67.85
    Current price £67.85 inc VAT
    £56.54 ex VAT

    Schneider A9F43316 Acti9 MCB iC60N 3 Pole 16A B Curve

    ACTI9 IC60N 3P 16A B MCB • This Acti9 iC60N is a low voltage miniature circuit breaker (MCB). • It is a 3P circuit breaker with 3 protected poles, ...

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    Original price £67.85 - Original price £67.85
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    £67.85 inc VAT
    £67.85 - £67.85
    Current price £67.85 inc VAT
    £56.54 ex VAT
  • Original price £28.74 - Original price £28.74
    Original price
    £28.74 inc VAT
    £28.74 - £28.74
    Current price £28.74 inc VAT
    £23.95 ex VAT

    Siemens 5SY4201-8 MCB DP Type D 1A 10Ka

    Siemens miniature circuit breaker is used to protect systems and installations in buildings and for industrial applications. The devices are approv...

    View full details
    Original price £28.74 - Original price £28.74
    Original price
    £28.74 inc VAT
    £28.74 - £28.74
    Current price £28.74 inc VAT
    £23.95 ex VAT
  • Original price £9.83 - Original price £9.83
    Original price
    £9.83 inc VAT
    £9.83 - £9.83
    Current price £9.83 inc VAT
    £8.19 ex VAT

    Siemens 5SY4150-8 MCB SP Type D 50A 10Ka

    Siemens miniature circuit breaker is used to protect systems and installations in buildings and for industrial applications. The devices are approv...

    View full details
    Original price £9.83 - Original price £9.83
    Original price
    £9.83 inc VAT
    £9.83 - £9.83
    Current price £9.83 inc VAT
    £8.19 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!

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