Type B & B+ RCDs

Type B RCDs provide protection against DC Residual Fault Currents, and against AC Residual Fault Currents up to 1000 hertz.

Type B+ RCDs provide protection against DC Residual Fault Currents, and against AC Residual Fault Currents up to 100 KHz.

Type B RCDs are used where DC residual currents could occur, for example, three phase rectified supplies, but also with microgenerators or SSEGs (Small Scale Electricity Generators) such as solar panels and wind generators. IEC 62109-1 specifies requirements for inverters used in photovoltaic systems that states clearly that only Type B RCDs should be used in such systems because Type A or Type AC RCDs cannot provide appropriate protection.

The use of Type B RCDs has grown in recent years because they provide comprehensive protection against all types of Residual Fault Currents.

Type B RCDs have numerous applications and are suitable for many industries including, electric vehicle charging, photovoltaic systems (solar panels), mines, tunnels, shipping, and any installation where there is a risk of DC current flowing. It is the technology that brings us closest to total protection for all known residual fault currents.

The standard Type B RCD will detect residual current faults comprising of pure AC up to 1000 hertz, rectified AC, pure DC and pulsating DC.

WA offers Type B RCD solutions in the form of technology that OEMs can integrate into their product and we also provide Type B & Type B+ RCD products compliant to IEC/EN 61008 and IEC/EN 62423.