The BU1 AC carries a calm, steady feel in the hand, and the click is firm.
Circutor GF72D Residual Current Relay 0.03-10A 230V AC 50Hz
You will find that this relay is a Hyster model, which blends a straightforward design with a reliable feel.
A nice touch with the Dold LG5925 Series is the consistent indicator light that shows coil status clearly.
With the 2Pcs size, you find that swapping one in during a job is quick and stress free.