CHINT NCZ2,
When the coil is energize, the coil current will generate a magnetic field and generate enough electromagnetic suction to overcome the reaction force,
so that the static core will generate electromagnetic suction to attract the moving core,
and the moving core will push the moving contact until it contacts the static contact,
so that the contact is connecte. When the coil voltage disappears or the coil voltage decreases to a certain value,
which is calle the release voltage, the moving core is release by the return spring, and the contact will then separate.

