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Circuit Protection

Collection: Circuit Protection

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Multiple tripping curves and current ratings and accessories available.

Miniature Circuit Breakers (MCBs) are essential protective devices designed to safeguard electrical circuits from damage caused by overloads and short circuits. By automatically interrupting the flow of electricity when a fault is detected, MCBs help prevent equipment damage, electrical fires, and system failures.

Designed for reliability and ease of use, MCBs provide fast and precise circuit protection in both residential and industrial electrical installations. Their compact design allows for simple installation on standard DIN rails, making them ideal for use in distribution boards, control panels, and electrical enclosures.

Available in a range of current ratings and tripping characteristics, MCBs can be selected to suit various applications, ensuring optimal protection for lighting circuits, power distribution, and electrical equipment. With durable construction and dependable performance, miniature circuit breakers play a vital role in maintaining safe and efficient electrical systems.

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276 products

Avon Controls
Competitive rates on all products
Siemens - MCB - 5SY43408 - D Curve 3 Pole 40A

Siemens MCB

Siemens - MCB - 5SY43408 - D Curve 3 Pole 40A

Regular price
Sale price £80.33 GBP Regular price £92.38 GBP
Siemens - MCB - 5SY43328 - D Curve 3 Pole 32A

Siemens MCB

Siemens - MCB - 5SY43328 - D Curve 3 Pole 32A

Regular price
Sale price £75.58 GBP Regular price £86.91 GBP
Siemens - MCB - 5SY43258 - D Curve 3 Pole 25A

Siemens MCB

Siemens - MCB - 5SY43258 - D Curve 3 Pole 25A

Regular price
Sale price £75.58 GBP Regular price £86.91 GBP
Siemens - MCB - 5SY43208 - D Curve 3 Pole 20A

Siemens MCB

Siemens - MCB - 5SY43208 - D Curve 3 Pole 20A

Regular price
Sale price £75.58 GBP Regular price £86.91 GBP
Siemens - MCB - 5SY43168 - D Curve 3 Pole 16A

Siemens MCB

Siemens - MCB - 5SY43168 - D Curve 3 Pole 16A

Regular price
Sale price £75.58 GBP Regular price £86.91 GBP
Siemens - MCB - 5SY43108 - D Curve 3 Pole 10A

Siemens MCB

Siemens - MCB - 5SY43108 - D Curve 3 Pole 10A

Regular price
Sale price £75.58 GBP Regular price £86.91 GBP
Siemens - MCB - 5SY43088 - D Curve 3 Pole 8A

Siemens MCB

Siemens - MCB - 5SY43088 - D Curve 3 Pole 8A

Regular price
Sale price £75.58 GBP Regular price £86.91 GBP
Siemens - MCB - 5SY43068 - D Curve 3 Pole 6A

Siemens MCB

Siemens - MCB - 5SY43068 - D Curve 3 Pole 6A

Regular price
Sale price £80.33 GBP Regular price £92.38 GBP
Siemens - MCB - 5SY43048 - D Curve 3 Pole 4A

Siemens MCB

Siemens - MCB - 5SY43048 - D Curve 3 Pole 4A

Regular price
Sale price £82.37 GBP Regular price £94.73 GBP
Siemens - MCB - 5SY43038 - D Curve 3 Pole 3A

Siemens MCB

Siemens - MCB - 5SY43038 - D Curve 3 Pole 3A

Regular price
Sale price £85.77 GBP Regular price £98.63 GBP
Siemens - MCB - 5SY43028 - D Curve 3 Pole 2A

Siemens MCB

Siemens - MCB - 5SY43028 - D Curve 3 Pole 2A

Regular price
Sale price £85.77 GBP Regular price £98.63 GBP
Siemens - MCB - 5SY43018 - D Curve 3 Pole 1A

Siemens MCB

Siemens - MCB - 5SY43018 - D Curve 3 Pole 1A

Regular price
Sale price £85.77 GBP Regular price £98.63 GBP
Siemens - MCB - 5SY42638 - D Curve 2 Pole 63A

Siemens MCB

Siemens - MCB - 5SY42638 - D Curve 2 Pole 63A

Regular price
Sale price £58.54 GBP Regular price £67.32 GBP
Siemens - MCB - 5SY42508 - D Curve 2 Pole 50A

Siemens MCB

Siemens - MCB - 5SY42508 - D Curve 2 Pole 50A

Regular price
Sale price £58.21 GBP Regular price £66.94 GBP
Siemens - MCB - 5SY42408 - D Curve 2 Pole 40A

Siemens MCB

Siemens - MCB - 5SY42408 - D Curve 2 Pole 40A

Regular price
Sale price £55.49 GBP Regular price £63.81 GBP
Siemens - MCB - 5SY42328-  D Curve 2 Pole 32A

Siemens MCB

Siemens - MCB - 5SY42328- D Curve 2 Pole 32A

Regular price
Sale price £50.38 GBP Regular price £57.94 GBP
Siemens - MCB - 5SY42258-  D Curve 2 Pole 25A

Siemens MCB

Siemens - MCB - 5SY42258- D Curve 2 Pole 25A

Regular price
Sale price £50.38 GBP Regular price £57.94 GBP
Siemens - MCB - 5SY42208 - D Curve 2 Pole 20A

Siemens MCB

Siemens - MCB - 5SY42208 - D Curve 2 Pole 20A

Regular price
Sale price £50.38 GBP Regular price £57.94 GBP
Siemens - MCB - 5SY42168 - D Curve 2 Pole 16A

Siemens MCB

Siemens - MCB - 5SY42168 - D Curve 2 Pole 16A

Regular price
Sale price £50.38 GBP Regular price £57.94 GBP
Siemens - MCB - 5SY42108 - D Curve 2 Pole 10A

Siemens MCB

Siemens - MCB - 5SY42108 - D Curve 2 Pole 10A

Regular price
Sale price £50.38 GBP Regular price £57.94 GBP
Siemens - MCB - 5SY42088 - D Curve 2 Pole 8A

Siemens MCB

Siemens - MCB - 5SY42088 - D Curve 2 Pole 8A

Regular price
Sale price £50.38 GBP Regular price £57.94 GBP
Siemens - MCB - 5SY42068 - D Curve 2 Pole 6A

Siemens MCB

Siemens - MCB - 5SY42068 - D Curve 2 Pole 6A

Regular price
Sale price £55.49 GBP Regular price £63.81 GBP
Siemens - MCB - 5SY42048 - D Curve 2 Pole 4A

Siemens MCB

Siemens - MCB - 5SY42048 - D Curve 2 Pole 4A

Regular price
Sale price £58.21 GBP Regular price £66.94 GBP

About Avon Controls

Avon Controls Ltd is a UK-based engineering solutions company specialising in advanced industrial automation and control solutions.

With over 20 years of experience, the company focuses on the design, manufacture, and integration of bespoke control panels and automation systems tailored to a wide range of industries, including manufacturing, energy, water treatment, and process control.

Known for its technical expertise and customer-focused approach, Avon Controls Ltd delivers reliable, innovative, and cost-effective solutions that improve operational efficiency and system performance. Its team of skilled employees works closely with clients to understand their specific requirements, ensuring every project meets the highest standards of quality, safety, and functionality.

Committed to excellence, Avon Controls Ltd combines industry knowledge with modern technology to provide dependable automation systems that support long-term business success.