NF33/11-12 48-130V50/60HZ-DC Contactor relay. NF33/11 contactor relays are used for switching auxiliary and control circuits including overlapping of lagging / leading contacts NF contactor relays include an electronic coil interface accepting a wide control voltage Uc min. ... Uc max. Only four coils cover control voltages between 24...500 V 50/60 Hz.