Categories
NHD Motor Starters 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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