Thermal cut-outs
Cut-outs can be fitted to certain resistors which will operate a contact to disconnect the resistor to prevent overload damage.

Resistance
The minimum and maximum values shown below are those available within a range of standard resistance alloys.You may select any ohmic value between Min and Max values.

Enclosed resistors
See the enclosure data section

Power ratings
 Standard continuous ratings are from 200 watts to 750 watts. For pulse ratings refer to the table below.

   Ohmic Values & Ratings - continuous, short time & intermittent
  TYPE CONT   SHORT TIME (seconds)   INTERMITTENT TIME (minutes)   OHMIC MIN VALUES MAX
        5 10 20   1/2 1 2 3 4 5      
    WATTS   WATTS WATTS WATTS   WATTS WATTS WATTS WATTS WATTS WATTS   OHMS OHMS
 
  PHD200    200   4000 3000 1800   1100 660 500 400 300 250   0.45 872
  PHD300    300   6000 4500 2700   1650 990 750 600 450 375   0.67 1294
  PHD400    400   8000 6000 3600   2200 1320 1000 800 600 500   0.90 1700
  PHD450    450   9000 6700 4000   2500 1500 1130 900 690 570   1.06 2100
  PHD600    600   12300 9200 5500   3200 1930 1460 1170 880 740   1.35 2600
  PHD750    750   14700 11000 6600   4000 2420 1830 1460 1100 920   1.60 3100
       
Operation Once Per Hour
  
Operating Time In Any 15 Minute Period
  
With Tapping Band
 
The Power In Watts To Give A Temperature Rise Of 300°C In Time Stated
 

  

   Dimensions (mm) - PHD open wound heavy duty resistors
  TYPE Watts  A  B  C  D  E  F  G  H  J  K  L
 
  PHD200 200  152  44  29  43  9.5  5  190  173  44  51 7 x 14
  PHD300 300  203  44  29  43  9.5  5  241  223  44  51 7 x 14
  PHD400 400  254  44  29  43  9.5  5  292  274  44  51 7 x 14
  PHD450 450  305  44  29  43  9.5  5  343  325  44  51 7 x 14
  PHD600 600  305  54  38  50  9.5  5  356  333  54  76 7 x 17
  PHD750 750  356  54  38  50  9.5  5  406  384  54  76 7 x 17