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MCBs

MCBs (Miniature Circuit Breakers) are essential electrical safety devices that protect against overcurrent and short circuits by tripping the circuit upon detection of a fault. These devices are typically installed in distribution boards for enhanced, automated electrical safety in residential, commercial, and industrial settings. An MCB comprises several key components, including a trip mechanism, a bimetallic strip or electronic sensor, and a toggle switch that work together to detect faults and trip the circuit breaker to disconnect the power supply. These electrical switches come in various sizes and current ratings to suit different applications and electrical loads. Additionally, MCBs can be manually reset once the fault condition is cleared by toggling the switch to its original position.

Advantages of Using MCBs Include

  • Compact Size: MCBs are relatively small compared to traditional fuses, making them ideal for installations with limited space.
  • Quick Response: MCBs rapidly respond to faults, reducing damage to electrical equipment and minimising downtime. 
  • Easy Reset: Unlike fuses, MCBs can be easily reset after tripping, making them more convenient for users.

Popular Types of MCBs

MCBs are categorised based on their tripping characteristics and include:

  • Type B MCBs – These circuit breakers can trip between 3 to 5 times the full load current and are suitable for residential applications.
  • Type C MCBs – They trip between 5 to 10 times the full load current and are ideal for commercial and industrial use.
  • Type D MCBs – These components trip between 10 to 20 times the full load current. They are used for specialised industrial applications with high inrush currents.

Where Can I Use MCBs?

MCBs are versatile safety components that are widely used in almost any electrical installation that requires protection from overcurrent and short circuit conditions. Some typical environments where MCBs can be used include:

  • Residential Buildings
  • Commercial Buildings
  • Industrial Facilities
  • Power Distribution Panels
  • Control Panels
  • Renewable Energy Systems
  • Automotive Applications
  • Marine and Offshore Applications.

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Legrand
Rohs Verified
4 077 77, Legrand
Pre Order
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£ 119.48
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£ 113.39
20 +
£ 109.64
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S403M-B63, ABB
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£ 174.11
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£ 169.26
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£ 164.71
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S403M-C13, ABB
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£ 102.22
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£ 99.38
10 +
£ 96.70
Schneider Electric
MG24427, Schneider Electric
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£ 73.31
Legrand
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4 078 34, Legrand
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£ 274.55
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£ 260.62
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£ 251.95
Legrand
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4 093 62, Legrand
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£ 630.50
Siemens
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5SY4332-8, Siemens
3 In Stock
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£ 72.28
Siemens
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5SY4306-8, Siemens
2 In Stock
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£ 76.83
Siemens
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5SY4216-8, Siemens
24 In Stock
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£ 48.19
Siemens
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5SY4202-7, Siemens
20 In Stock
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£ 57.17
Allen Bradley
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1492-SPM2B050, Allen Bradley
4 In Stock
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£ 32.29
Allen Bradley
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1492-SPM2D010, Allen Bradley
14 In Stock
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£ 33.94
Allen Bradley
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1492-SPM1C160, Allen Bradley
5 In Stock
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£ 11.06
Allen Bradley
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1492-SPM3D400, Allen Bradley
2 In Stock
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£ 70.84
Allen Bradley
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1492-SPM1B100, Allen Bradley
9 In Stock
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£ 12.55
Allen Bradley
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1492-SPM1D320, Allen Bradley
1 In Stock
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£ 16.39
Allen Bradley
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1492-SPM2C010, Allen Bradley
9 In Stock
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£ 33.39
Allen Bradley
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1492-SPM2C040, Allen Bradley
10 In Stock
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£ 33.39
Allen Bradley
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1492-SPM2D630, Allen Bradley
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£ 80.09
Allen Bradley
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1492-SPM3D100, Allen Bradley
7 In Stock
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£ 47.35
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S403M-C10, ABB
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£ 102.22
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£ 99.38
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£ 96.70
Siemens
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5SY4210-8, Siemens
5 In Stock
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£ 52.21
Legrand
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4 062 60, Legrand
2 In Stock
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£ 60.30
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£ 57.23
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£ 55.36
Schneider Electric
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A9F53120, Schneider Electric
27 In Stock
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£ 21.29
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£ 20.68
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£ 20.15
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2CCS553001R0635 - S403EB63, ABB
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£ 122.42
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£ 116.30
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£ 110.19
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5SY4332-8, Siemens

5SY4332-8, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4216-8, Siemens

5SY4216-8, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4202-7, Siemens

5SY4202-7, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4204-7, Siemens

5SY4204-7, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4310-7, Siemens

5SY4310-7, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4206-7, Siemens

5SY4206-7, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4220-7, Siemens

5SY4220-7, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4106-7, Siemens

5SY4106-7, Siemens

Stratum 400 MCBs Professional range of 5SY4 series miniature circuit breakers from Siemens. These circuit breakers have type C characteristics that offer short circuit responses and provides protection at a supply voltage of 400 V. The breaking capacity in the event of short-circuit current is 10 kA. The 5SY4 series circuit breakers are available with either 1 or 3 pole and can be used in industrial applications. All models are highly reliable and excellent quality. Terminal Capacity: 35 mm square (Solid and stranded - Upper and Lower Terminal); 25 mm square (Finely stranded with end sleeves - Upper and Lower Terminal)IP Rating: IP20 (according to DIN 40 050); IP40 (When mounted in distribution boards)Standards Standards: EN 60898; DIN VDE 0641; Part 11; IEC 60898Standards EN 60898; DIN VDE 0641; Part 11; IEC 60898Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY41027, Siemens

5SY41027, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Standards EN 60898; DIN VDE 0641; part 11; IEC 60898 Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SY4103-7, Siemens

5SY4103-7, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Miniature circuit breakers from Siemens, offer the highest quality and reliability. The excellent technical properties of the devices mean you are always on the safe side. Apart from that you benefit from the innovative mounting options which enable quick and easy installation. The miniature circuit breakers from Siemens can be combined as required with a wide range of supplementary components e.g. control current switches, fault signal contacts, shunt releases, under voltage releases, remote operating mechanisms or with RCCB units to provide protection for persons and against fire. Features and Benefits Automatic cut-out, 1, 2,3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Supports fast and convenient removal from the assembly Standards IEC 60898 - Relates to Low Voltage Circuit Breakers for use in household and similar Installations. In the UK traditionally known as miniature circuit breakers (MCB’s). Q: What is the differences in the Tripping Curves B, C, and D? A: Curve B: Tripping: 3 to 5 times the rated current. Applications: protection of generators, persons, very long cables Curve C: Tripping: 5 to 10 times the rated current Applications: protection of circuits and general applications Curve D: Tripping: 10 to 14 times the rated current Applications: protection of high surge circuits, welders, transformers and motors Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Standards EN 60898; DIN VDE 0641; part 11; IEC 60898 Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making i...
New items
5SY4310-8, Siemens

5SY4310-8, Siemens

Automatic cut-out, 5SY4 Series, 10 kA, B, C and D characteristic Automatic cut-out, 1, 2, 3 and 4-pole DIN rail assembly For use in industry, and in the functional and residential construction sector Voltage rating: 230 V / 400 VAC250 V / 440 VAC AC, 60 VDC / pole Suppression rating: 10 kA Installation depth: 70 mm Siemens RCDs, RCBOs, RCCBs and MCBs Type B characteristic offers instantaneous short circuit response level of 3-5 x normal rated current, making it suitable for circuits with moderate inrush currents such as filament lamps, heating loads and most domestic/small building protection applications.,Type C characteristic offers short circuit response of 5-10 x normal rated current, making it ideal for circuits with higher inrush currents such as motor control and fluorescent lighting installations in industrial buildings where nuisance tripping might occur if a faster type was used. Type D characteristic is designed for high inrush loads. Magnetic trip point - 10 to 20 times In rating. Thermal trip point - 1.13 to 1.45 protector rating. Type AC characteristic ensure tripping for sinusoidal, alternating currents, whether they be quickly applied or slowly to increase.
New items
5SJ43207HG42, Siemens

5SJ43207HG42, Siemens

Circuit breaker 10kA, 3-pole, C, 20A
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like MCBs and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding MCBs or any other product.
This depends on the MCBs individual product and information that can be found on our website.
Yes, we offer special discounts on orders above £200 for MCBs and all other products.
UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including MCBs.
Yes. We keep updating our stock frequently and if a product like MCBs is not in stock then we will let you know.