Express Transformers offer a range of 750 watt wire wound power resistors with up to 24 ohmic values in the range. Each resistor is supplied with a tapping band and is cement coated for stability and durability.
The resistors are wound on a sturdy ceramic former using nickel/copper wire to BS 115. The stability is ensured by holding the winding in place with a cement coating that prevents the turns from moving and shorting out.
The ohmic values shown in the table overleaf are the maximum values obtainable with each gauge of wire within a tolerance of ±10%. The tapping bands can be used to obtain intermediate values. One band is provided as standard and others can be fitted if required.
The current rating shown produce a temperature rise of approximately 300°C on the surface of the wire when the resistor is mounted vertically in an ambient temperature of 20°C.
For each 15°C increase in the ambient temperature the current ratings are to be reduced by 5%.
All terminals are nickel silver bands with nickel plated brass screws and nuts and have the facility for either a solder or screw type extra connection.
|Dimensions in mm|
|ET/750/14-||355.6||54||406.4||381||54||77.8||12.7 x 6.3|
Resistor Slider Clips
Each resistor is fitted with one slider clip as standard. Extra clips can be supplied on request and should be specified from the following table.
Short Term Ratings
|5 Secs||10 Secs||20 Secs||Note
The power in watts to give a T°C rise
of 300°C in the stated time
|ET/750/14-||17500 Watts||14500 Watts||12000 Watts|