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Contactors

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Contactors

NHD Contactors are marked with voltage values (Ue) and with horsepower (or Kilowatt) ratings, for use with the maximum AC3 operatuional Current (Ie)

Nature of Current

Category

Typical Applications

A.C.

AC-1

Non-inductive or slightly inductive loads, resistance furnaces

 

AC-3

Squirrel-cage motors: starting, switching off motors during running

Any time the duty cycle includes significant jogging and plugging a larger size NHD contactor is selected than would be needed for pure AC3 Applications. Operational current shown are maximums 

Nameplate Ratings 

HP & KW : The maximum rating for each stated operational voltage ( Ue) and Utilization Category. The most common Kilowat or HP ratings on a contactor or starter are for AC3 

Thermal Current (Ith): The maximum current which an open contactor or starter may be expected to carry continuously without exceeding the temperture rises allowed by the IEC Standard. This is not a load switching rating. 

Rated Operational Current (Ie): The maximum FLA at which a motor starter or Contactor may be used for a given combination of voltage, frequency and utilization category. A device may have more than one operational current. 

Rated Insulation Voltage (Ui): A design parameter shown defines the insulation properties of the contactor. 

Rated Operational Voltage (Ue): The voltage at which each stated horsepower or kilowatt rating applies  

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