What is the operation diagram for Zelio latching relays RHK .
This Latching relay is equipped by two coils. When the voltage is on first coil A1/A2 it cause closing the contacts. When the voltage is cut from the coil A1/A2 the contacts remains closed, so they also remain closed after resupplying the coil A1/A2. To open the contacts the voltage must be lead to 2nd (unlatching) coil B1/B2 (without any voltage on the A1/A2 coil). Functional diagram in the attached file.