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 250 watts to 1,000 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
 
  PT200H    250   5000 3750 2250 1375 825 625 500 375 310 0.6 25
  PT300H    400   8000 6000 3600 2200 1320 1000 800 600 500 0.6 30
  PT400H    525   10500 7875 4700 2900 1730 1310 1050 785 655 1.0 30
  PT450H    600   12000 9000 5400 3300 1980 1500 1200 900 750 1.5 40
  PT600H    800   16000 12000 7200 4400 2640 2000 1800 1200 1000 3.0 60
  PT750H    1000   20000 15000 9000 5500 3300 2500 2000 1500 1250 3.5 100
       
Operation Once Per Hour
  
Operating Time In Any 15 Minute Period
    
 
The Power In Watts To Give A Temperature Rise Of 300°C In Time Stated
 

  

   Dimensions (mm) - PT tape wound heavyduty power resistors
  TYPE Watts  A  B  C  D  E  F  G  H  J  K  L
 
  PT200H    250  152  44  29  43  9.5  5  190  173  44  51 7 x 14
  PT300H    400  203  44  29  43  9.5  5  241  223  44  51 7 x 14
  PT400H    525  254  44  29  43  9.5  5  292  274  44  51 7 x 14
  PT450H    600  305  44  29  43  9.5  5  343  325  44  51 7 x 14
  PT600H    800  305  54  38  50  9.5  5  356  333  54  76 7 x 17
  PT750H    1000  356  54  38  50  9.5  5  406  384  54  76 7 x 17