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Type B RCBOs

Type B RCBO

What is a Type B RCBO?

A Type B RCBO (Residual Current Circuit Breaker with Overcurrent Protection) is an advanced electrical protection device designed to better protect against a wider range of electrical faults.

Unlike standard Type A RCBOs, which primarily detect sinusoidal AC currents, Type B RCBOs can also detect pulsating DC currents, making them suitable for wider applications.

When Should You Use a Type B RCBO?

Type B RCBOs are recommended for installations where electrical equipment with electronic components or variable speed drives is present. 

They’re vital for environments with a higher risk of encountering pulsating DC currents, such as those generated by switch-mode power supplies or electronic motor drives. 

Their main uses can include:

  • Industrial Machinery: Type B RCBOs are important for protecting sensitive electronic equipment commonly found in industrial machinery, such as CNC machines, robotic systems, and automated manufacturing equipment.
  • Data Centres: In data centre environments, where hundreds of electronic devices and power supplies could be in operation, Type B RCBOs provide protection against pulsating DC currents. This can safeguard critical data and help keep everything in operation. 
  • Renewable Energy Systems: Type B RCBOs play a crucial role in renewable energy installations, such as solar photovoltaic (PV) systems and wind turbines, where inverters and other electronic components generate pulsating DC currents that require detection and protection.
  • Medical Equipment: Medical facilities rely on sensitive electronic equipment for diagnostics, treatment, and patient care. Type B RCBOs are indispensable here to protect the safety and reliability of medical devices and prevent hazards to patients and staff.

What’s the Difference Between a Type A and Type B RCBO?

The primary difference between Type A and Type B RCBOs is their sensitivity to different currents. 

While Type A RCBOs detect sinusoidal AC currents, Type B RCBOs offer additional sensitivity to pulsating DC currents, making them more versatile and suitable for a wider range of applications.

What’s the Difference Between a Type B and Type C RCBO?

While both Type B and Type C RCBOs offer enhanced sensitivity to a broader range of electrical faults compared to Type A RCBOs, they differ in their response characteristics. 

Type B RCBOs are specifically designed to detect pulsating DC currents, whereas Type C RCBOs are optimised for high-frequency AC currents, such as those generated by semiconductor devices.

Type B RCBOs provide better versatility and reliability in places with more electronic equipment or variable-speed drives.


  • Original price £27.10 - Original price £27.10
    Original price
    £27.10 inc VAT
    £27.10 - £27.10
    Current price £27.10 inc VAT
    £22.58 ex VAT

    Legrand 606418 RCBO Single Pole + Neutral Class AC Type B 16A 30mA 10kA 1 Module

    Current Rating: 16A • Number of Poles: 1 Pole+Neutral • Trip Sensitivity: 30MA

    Original price £27.10 - Original price £27.10
    Original price
    £27.10 inc VAT
    £27.10 - £27.10
    Current price £27.10 inc VAT
    £22.58 ex VAT
  • Original price £4.81 - Original price £4.81
    Original price
    £4.81 inc VAT
    £4.81 - £4.81
    Current price £4.81 inc VAT
    £4.01 ex VAT

    Luceco CUCRB40 RCBO Single Pole Type B Compact DIN Rail 40A

    BG CUCR Residual Current Circuit Breaker comes with overcurrent protection (RCBO) allows maximum usage of cable space within the consumer units and...

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    Original price £4.81 - Original price £4.81
    Original price
    £4.81 inc VAT
    £4.81 - £4.81
    Current price £4.81 inc VAT
    £4.01 ex VAT
    Sold out
  • Original price £4.81 - Original price £4.81
    Original price
    £4.81 inc VAT
    £4.81 - £4.81
    Current price £4.81 inc VAT
    £4.01 ex VAT

    Luceco CUCRB10 RCBO Single Pole Type B Compact DIN Rail 10A

    BG CUCR Residual Current Circuit Breaker comes with overcurrent protection (RCBO) allows maximum usage of cable space within the consumer units and...

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    Original price £4.81 - Original price £4.81
    Original price
    £4.81 inc VAT
    £4.81 - £4.81
    Current price £4.81 inc VAT
    £4.01 ex VAT
    Sold out
  • Original price £35.22 - Original price £35.22
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    £35.22 inc VAT
    £35.22 - £35.22
    Current price £35.22 inc VAT
    £29.35 ex VAT

    Eaton AD32BH30 6kA 32A 30mA Type B RCBO

    Original price £35.22 - Original price £35.22
    Original price
    £35.22 inc VAT
    £35.22 - £35.22
    Current price £35.22 inc VAT
    £29.35 ex VAT
    Sold out
  • Original price £29.78 - Original price £29.78
    Original price
    £29.78 inc VAT
    £29.78 - £29.78
    Current price £29.78 inc VAT
    £24.82 ex VAT

    Volex VRCBO10/1B RCBO SP Type B 10A 30Ma 1 Module

    Original price £29.78 - Original price £29.78
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    £29.78 inc VAT
    £29.78 - £29.78
    Current price £29.78 inc VAT
    £24.82 ex VAT
    Sold out
  • Original price £89.54 - Original price £89.54
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    £89.54 inc VAT
    £89.54 - £89.54
    Current price £89.54 inc VAT
    £74.62 ex VAT

    Hager ACA132U RCBO SP Class A Type B 32A 10Ma 10Ka 1 Module

    Hager ACA Electronic Residual Current Circuit Breaker with Overcurrent Protection (RCBO) provides MCB overload protection and RCD earth leakage pro...

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    Original price £89.54 - Original price £89.54
    Original price
    £89.54 inc VAT
    £89.54 - £89.54
    Current price £89.54 inc VAT
    £74.62 ex VAT
  • Original price £42.08 - Original price £42.08
    Original price
    £42.08 inc VAT
    £42.08 - £42.08
    Current price £42.08 inc VAT
    £35.07 ex VAT

    Legrand 410924 RCBO Dx3 Sp+N Type B 32A 30Ma

    Original price £42.08 - Original price £42.08
    Original price
    £42.08 inc VAT
    £42.08 - £42.08
    Current price £42.08 inc VAT
    £35.07 ex VAT
  • Original price £80.93 - Original price £80.93
    Original price
    £80.93 inc VAT
    £80.93 - £80.93
    Current price £80.93 inc VAT
    £67.44 ex VAT

    Crabtree 61/BM10AFD RCBO SPN Type B AFDD Combination 10A 30Ma

    Crabtree can help you comply with the 18th Edition with our Arc Fault Detection Devices. Get more room in your installation thanks to our Miniature...

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    Original price £80.93 - Original price £80.93
    Original price
    £80.93 inc VAT
    £80.93 - £80.93
    Current price £80.93 inc VAT
    £67.44 ex VAT

Type B RCBO

What is a Type B RCBO?

A Type B RCBO (Residual Current Circuit Breaker with Overcurrent Protection) is an advanced electrical protection device designed to better protect against a wider range of electrical faults.

Unlike standard Type A RCBOs, which primarily detect sinusoidal AC currents, Type B RCBOs can also detect pulsating DC currents, making them suitable for wider applications.

When Should You Use a Type B RCBO?

Type B RCBOs are recommended for installations where electrical equipment with electronic components or variable speed drives is present. 

They’re vital for environments with a higher risk of encountering pulsating DC currents, such as those generated by switch-mode power supplies or electronic motor drives. 

Their main uses can include:

  • Industrial Machinery: Type B RCBOs are important for protecting sensitive electronic equipment commonly found in industrial machinery, such as CNC machines, robotic systems, and automated manufacturing equipment.
  • Data Centres: In data centre environments, where hundreds of electronic devices and power supplies could be in operation, Type B RCBOs provide protection against pulsating DC currents. This can safeguard critical data and help keep everything in operation. 
  • Renewable Energy Systems: Type B RCBOs play a crucial role in renewable energy installations, such as solar photovoltaic (PV) systems and wind turbines, where inverters and other electronic components generate pulsating DC currents that require detection and protection.
  • Medical Equipment: Medical facilities rely on sensitive electronic equipment for diagnostics, treatment, and patient care. Type B RCBOs are indispensable here to protect the safety and reliability of medical devices and prevent hazards to patients and staff.

What’s the Difference Between a Type A and Type B RCBO?

The primary difference between Type A and Type B RCBOs is their sensitivity to different currents. 

While Type A RCBOs detect sinusoidal AC currents, Type B RCBOs offer additional sensitivity to pulsating DC currents, making them more versatile and suitable for a wider range of applications.

What’s the Difference Between a Type B and Type C RCBO?

While both Type B and Type C RCBOs offer enhanced sensitivity to a broader range of electrical faults compared to Type A RCBOs, they differ in their response characteristics. 

Type B RCBOs are specifically designed to detect pulsating DC currents, whereas Type C RCBOs are optimised for high-frequency AC currents, such as those generated by semiconductor devices.

Type B RCBOs provide better versatility and reliability in places with more electronic equipment or variable-speed drives.


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