A Wide Range Of Circuit Breakers
Our comprehensive range of consumer unit circuit breakers and accessories covers everything from enclosures to RCBOs. Our range includes low-voltage domestic and commercial breakers (MCBs & RCBOs, up to 63A).
Miniature Circuit Breakers (MCBs)
MCBs provide reliable protection against overload and short circuits in domestic and commercial installations. Our Type B MCBs are available in a wide range of ratings, including:
RCBO Modules
RCBOs (Residual Current Circuit Breaker with Overcurrent protection) combine the functions of an MCB and an RCD, offering protection against both earth leakage and overload/short circuits. Our range includes:
Enclosures
We stock a Wall Mounted RCD/MCB Enclosure, designed to provide safe and secure housing for breakers in standalone or small installations.
Fuse Wire Cards
For traditional fuse boards, BES supplies Fuse Wire Cards with 5A, 15A, and 30A ratings, ensuring you always have spares when needed.
What Are Circuit Breakers?
Circuit breakers are essential safety devices that protect electrical circuits from overloads, short circuits, and earth leakage faults. By automatically cutting off power when an electrical fault is detected, they reduce the risk of fire and protect both appliances and people.
Where Are Circuit Breakers Used?
Circuit breakers are installed in consumer units and distribution boards to protect individual circuits such as lighting, sockets, or appliances. They are essential in both residential and commercial electrical systems, ensuring safe and compliant installations.
How To Install Or Replace A Circuit Breaker
Installation should always be carried out by a qualified electrician. The process involves switching off the mains supply, securing the breaker in the consumer unit, and connecting the appropriate wires. Once installed, the breaker must be tested to confirm it trips correctly under fault conditions.
Choosing The Right Circuit Breaker
The correct breaker depends on both the circuit type and load requirements.
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6A–10A MCBs are typically used for lighting circuits.
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16A–32A MCBs are suitable for socket outlets, cookers, and appliances.
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RCBOs are recommended where both overload and earth leakage protection are required.
Always check the circuit’s expected load and regulatory requirements before selecting. And if you need advice on which circuit breaker is right for your job, give us a call on 0800 801090.
Shop Circuit Breakers Online With BES
For more than 50 years, BES has been a trusted supplier of electrical components to electricians, contractors, and trade professionals across the UK.
When you shop with BES, you’ll benefit from fast and reliable next working day delivery on most items, as well as competitive prices across our entire electrical range. We make the buying process simple, with a Quick Shop option and a 30-day returns policy for refunds or replacements if needed. Just as importantly, our customer service team is always on hand to offer support and advice, ensuring you get the right product for the job.
We’re proud to be rated Excellent on reviews.co.uk, with thousands of customers recognising our commitment to quality, value, and service. Whether you’re upgrading a consumer unit, replacing a faulty breaker, or fitting out a new installation, you can order from BES with complete confidence.
Circuit Breakers FAQs
How do circuit breakers work?
An MCB works by automatically tripping when it detects overload or short-circuit current, cutting the power supply before damage occurs. An RCBO adds earth leakage protection for even greater safety.
What is the difference between an MCB and an RCBO?
A miniature circuit breaker (MCB) protects against overload and short circuits, while an RCBO (Residual Current Breaker with Overcurrent protection) combines MCB protection with residual current (earth leakage) protection. This makes RCBOs ideal where both electrical safety and overload protection are required.
Which circuit breaker size do I need?
The right size depends on the type of circuit and its load. Lighting circuits often use 6A or 10A breakers, while socket outlets and appliances may require 16A to 32A. Larger loads, such as cookers or showers, typically use 40A or more. Always check installation requirements and regulations before choosing.
Can I install a circuit breaker myself?
For safety and compliance reasons, circuit breakers should only be installed by a qualified electrician. They will ensure the correct breaker is fitted, connections are made securely, and the breaker is tested to confirm it trips correctly.
Do I need an RCBO for every circuit?
RCBOs provide the highest level of protection by combining overload, short-circuit, and earth leakage protection in a single device. Many electricians now recommend fitting RCBOs on individual circuits, particularly in modern consumer units, for maximum safety.
Are all BES circuit breakers compatible with standard consumer units?
Our MCBs and RCBOs are designed for common UK consumer units. Always check the brand and type of your existing unit before purchasing to ensure compatibility. If you’re unsure, our team can help you choose the right breaker.
What delivery options are available for circuit breakers?
Most circuit breakers and accessories are available for next working day delivery, and we also offer convenient click-and-collect services. This ensures you get the parts you need quickly and with minimal disruption to your project.
Can I return an item I bought online at BES?
All our products, including our circuit breakers, come with a standard manufacturer’s warranty and are covered by our 30-day returns policy.
