Type B RCD blocks are also sensitive to continuous or predominantly continuous (continuous with weak ondulation) pulsating earth fault currents. At the same time, they are also sensitive to sinusoidal and direct pulsating earth fault currents as in the case of type A circuit breakers.
They fulfill the requirements of Type A devices and consequently the requirements for Type AC devices, which can be considered as an extension. For this reason, Type B differential blocks are sometimes referred to as "universal type" since they respond to "all" types of fault currents.
The DDA200 type B can be coupled with all circuit breakers of the S 200 series and are used for protection of installations with electronic equipment according to EN 50178.