Starter contacts are indicated either for their position or for their function. In such a case, normally closed contact means that they are

in closed condition in all the status of relay

open when the relay coil is de-energised

open when the relay coil is energised

closed when the relay coil is energised

current sensing relay

under current relay

voltage sensing relay

latching relay

Under current relay

Voltage sensing relay

Latching relay

Current sensing relay

Impulse relay

Dry reed relay

Thermal relay

Free relay

placing asbestos between the contacts

providing a shading coil near the tip of the magnetic field

cleaning the dirty particles over the coil and contacts

applying varnish over the coil core