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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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2CCS553001R0635 - S403EB63, ABB
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£ 142.59
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2CCS573001R0984 - S403MB0.5, ABB
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£ 125.67
Legrand
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4 077 77, Legrand
2 In Stock
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£ 124.69
Siemens
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5SY4332-8, Siemens
8 In Stock
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£ 109.77
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5SY4306-8, Siemens
10 In Stock
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£ 116.67
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5SY4216-8, Siemens
3 In Stock
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£ 73.17
Siemens
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5SY4202-7, Siemens
7 In Stock
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£ 86.82
Schneider Electric
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A9F53216, Schneider Electric
75 In Stock
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£ 82.57
Schneider Electric
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A9F53240, Schneider Electric
4 In Stock
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£ 91.35
Schneider Electric
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A9F53363, Schneider Electric
25 In Stock
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£ 161.90
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A9F53440, Schneider Electric
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£ 186.85
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A9F54204, Schneider Electric
27 In Stock
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£ 76.95
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£ 72.33
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£ 69.26
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A9F55116, Schneider Electric
38 In Stock
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£ 28.53
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A9F55150, Schneider Electric
10 In Stock
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£ 38.43
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A9F55201, Schneider Electric
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£ 97.04
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£ 94.35
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£ 91.79
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A9F55220, Schneider Electric
1 In Stock
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£ 86.98
Schneider Electric
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A9F55232, Schneider Electric
20 In Stock
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£ 86.98
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A9F55340, Schneider Electric
26 In Stock
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£ 139.18
Schneider Electric
EZ9F66120, Schneider Electric
42 In Stock
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£ 4.86
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£ 4.72
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£ 4.59
Siemens
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5SL6602-7, Siemens
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£ 111.71
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5SY4380-6, Siemens
1 In Stock
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£ 201.37
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5SY4606-7, Siemens
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£ 126.88
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5SY4620-7, Siemens
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£ 118.61
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5SL6305-7, Siemens
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£ 71.02
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5SL6314-7, Siemens
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£ 71.02
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New Items
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5SJ65136KS, Siemens

5SJ65136KS, Siemens

Series 5SJ6 MCBs - 6kA, B & C Characteristics Line protective switches with quick plug in terminals Mainly used to protect socket outlet and lighting circuits with rated currents from 10 to 63 A DIN rail assembly Touch protection to VBG4 / BGV A2 Rated voltage: 1P - 230/400Vac; 1P+N - 230Vac; 2P/3P+N/4P - 400Vac Breaking capacity: 6kA Double screwless outgoing terminal for rigid and flexible contuctors: - rigid: 1 to 4mm - Flexible: 1 to 2.5mm If flexible conducts, no end sleeves necessary Completely compatibility with all other 5SJ and 5SY miniature circuit breakers Tool-free disconnection and manual removal depth 70mm Standards EN 60898, VDE 0641 part of 11, IEC 60898 Standards EN 60898, VDE 0641 part of 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
2CCS862001R0635, ABB

2CCS862001R0635, ABB

B-type bipolar from 50 kA - S800 Series The ABB S800 series high-performance automatic circuit breakers set a new standard of excellence, thanks to their high current rating, breaking capacity, selectivity and safety features. They are the ideal solution for protecting your systems. Compact design, excellent current limitation and circuit breaker position indicators are just some of the characteristics that make this series highly flexible and functional. In addition, customers can select between cage or ring terminals and can chose from a wide range of accessories. B-type characteristics guarantee a short circuit cut-off response of 3-5 with normal nominal current. Suited for use in circuits that normally produce low surge currents, such as heaters and heating systems. Din-rail mounting Operating temperature range: -25 to +60°C Operating voltage range: 400 to 690 Vac, 50 to 60 Hz Width: 53 mm Standards EN 60898-1, IEC 60947-2, UL489 Approvals CCC, GOST-R, LR, DNV, RINA ABB System Pro M Single & Double Pole MCB's Note The Classic & System pro M product cannot be intermixed and do not share common accessories. System pro M products can only be fitted to new style Protecta distribution boards,see typically stock no. 539-1553.
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5SJ65137KS, Siemens

5SJ65137KS, Siemens

Series 5SJ6 MCBs - 6kA, B & C Characteristics Line protective switches with quick plug in terminals Mainly used to protect socket outlet and lighting circuits with rated currents from 10 to 63 A DIN rail assembly Touch protection to VBG4 / BGV A2 Rated voltage: 1P - 230/400Vac; 1P+N - 230Vac; 2P/3P+N/4P - 400Vac Breaking capacity: 6kA Double screwless outgoing terminal for rigid and flexible contuctors: - rigid: 1 to 4mm - Flexible: 1 to 2.5mm If flexible conducts, no end sleeves necessary Completely compatibility with all other 5SJ and 5SY miniature circuit breakers Tool-free disconnection and manual removal depth 70mm Standards EN 60898, VDE 0641 part of 11, IEC 60898 Standards EN 60898, VDE 0641 part of 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.
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S201-D40, ABB

S201-D40, ABB

Type D Single Pole 6kA - System pro M Type D characteristic offers short circuit response (but greater than Type C) of 10-13 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. DIN rail mounting Complies with BS EN 60898 Operating temperature range of -25°C to +55°C Standard 17.5mm width Max. operating voltage: 440Vac, 60Vdc Note The Classic & System pro M product cannot be intermixed and do not share common accessories. System pro M products can only be fitted to new style Protecta distribution boards,see typically stock no. 539-1553. ABB System Pro M Single & Double Pole MCB's Note The Classic & System pro M product cannot be intermixed and do not share common accessories. System pro M products can only be fitted to new style Protecta distribution boards,see typically stock no. 539-1553.
New items
S204-C50, ABB

S204-C50, ABB

Type C 4 Pole 6kA - System Pro M Compact The ABB S200 Series of MCB offer a compact solution for protection requirements. These miniature circuit breakers are current limiting; DIN rail mounted and can offer a good equivalent to fused systems. 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. DIN rail mounting Complies with BS EN 60898 Finger Safe Terminals
New items
5SY61147, Siemens

5SY61147, Siemens

Series 5SY6 MCBs - 6kA, B & C Characteristics Line protective switches Short circuit protection ensured by miniature circuit breaker of characteristic B or C Safe and rapid connection of the feeder cables due to relocation of busbar at the rear DIN rail assembly Identical terminals at both sides for an optional infeed from the top or the bottom No tools required for mounting or dismantling Supports fast and convenient removal from the assembly Rated voltage: 230V→400Vac, 250V→400Vac, 60Vdc pole Breaking capacity: 6A→32A Conduct cross sections for connection: - solid: 0.75 - 35mm; Fine stranded with end sleeves: 0.75 - 25mm An auxiliary circuit switch or fault contact can be retrp-fitted to the left-hand side of the circuit breaker housing enclosure: IP20 equipment Depth 70mm Ambient temperature: -25→+45°C Standards EN 60898, VDE 0641 part of 11, IEC 60898 Standards EN 60898, VDE 0641 part of 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
5SY43047, Siemens

5SY43047, 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
5SJ65206KS, Siemens

5SJ65206KS, Siemens

Series 5SJ6 MCBs - 6kA, B & C Characteristics Line protective switches with quick plug in terminals Mainly used to protect socket outlet and lighting circuits with rated currents from 10 to 63 A DIN rail assembly Touch protection to VBG4 / BGV A2 Rated voltage: 1P - 230/400Vac; 1P+N - 230Vac; 2P/3P+N/4P - 400Vac Breaking capacity: 6kA Double screwless outgoing terminal for rigid and flexible contuctors: - rigid: 1 to 4mm - Flexible: 1 to 2.5mm If flexible conducts, no end sleeves necessary Completely compatibility with all other 5SJ and 5SY miniature circuit breakers Tool-free disconnection and manual removal depth 70mm Standards EN 60898, VDE 0641 part of 11, IEC 60898 Standards EN 60898, VDE 0641 part of 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.
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.