What is a Type B RCCB?

A Type B Residual Current Circuit Breaker (RCCB) is an advanced electrical safety device designed to protect against all types of residual fault currents. It is essential in modern installations where equipment like electric vehicle chargers, solar inverters, and variable speed drives are used. This guide explains everything you need to know.

Key Functions and Protection Scope

Unlike standard RCCBs, a Type B RCCB offers comprehensive protection. It detects and trips in response to:

• AC sinusoidal residual currents.
• Pulsating DC residual currents.
• Smooth DC residual currents, which are the most dangerous and can be generated by modern electronics.

This makes it the only device suitable for circuits with frequency converters or three-phase rectifiers.

Where is a Type B RCCB Required?

Installation of a Type B RCCB is critical for safety in specific applications. It is mandatory for protecting circuits supplying:

• Electric Vehicle (EV) charging stations.
• Photovoltaic (PV) solar power systems.
• Industrial machinery with variable speed drives (VSDs).
• Medical equipment in healthcare facilities.

Using a lesser device (Type A or AC) in these scenarios can leave dangerous fault currents undetected.

Common Questions About Type B RCCBs

Can I replace a Type A RCCB with a Type B?

Yes, a Type B RCCB can always replace a Type A or AC type, as it provides the same protection plus more. However, you cannot replace a Type B with a lower type if the circuit demands it. Always consult a qualified electrician.

How do I choose the right Type B RCCB?

Selection depends on the application’s rated current and sensitivity. Common sensitivities are 30mA for personal protection and 300mA for fire prevention. Ensure the device carries the proper certifications for your region.

Ensure Ultimate Electrical Safety

As technology evolves, so do electrical risks. A Type B residual current circuit breaker is the highest standard of protection against both AC and DC fault currents. For your safety and compliance, always specify the correct device for advanced electronic equipment.

Ready to upgrade your protection? Consult with a certified electrical professional today to assess your needs and ensure your installation is safe and compliant with the latest regulations.