RCD’s (Residual Current Device) are available in many types, the type is not to be confused with overcurrent protective device “curve” type.
RCD’s on their own do not offer any kind of overcurrent protection unless it is an RCBO (Residual Current Breaker with Over-Current) to BS EN 61009.
The correct selection of an RCD type all depends on what the RCD is required for, it is the designers responsibility to ensure the correct RCD or RCBO is selected for the job.
BS 7671:2018 regulation 531.3.3 states ‘different types of RCD’s exist, depending on their behaviour in presence of DC components and frequencies. The appropriate RCD shall be selected.