These wire-wound resistors are manufactured with the highest grade Nickel Chrome and Copper Nickel alloy wires to provide mechanically uniform tension and spacing.
Salient Features
- Spot welded joints for reliability.
- Low temperature co-efficient, low surface temperature.
- Brackets available for horizontal as well as vertical mountings.
- Exceptional stability and performance.
Performance Data
| Test |
Procedure |
Requirements |
| Short Time Overload |
10 X Rated power for 5 sec. |
Δ R / R max : ±(2.0 +0.05 Ώ) |
| Dielectric Withstanding Voltage |
1000 VAC, from terminal to mounting
hardware. |
No flash over or breakdown should
observed |
| Endurance @ 25°C |
1000hrs. Load with Pn (power nominal)
1.5 hr. ON & 0.5 hr. OFF |
No visual damange
Δ R / R max : ±(5.0 +0.01 Ώ) |
| Temperature Rise Test |
Horizontally mounted, loaded with Pn |
Hot spot temperature less than
maximum body temperature |
| Temperature Coefficient |
At 25 /-55/25 0C & 25/ 150/ 25 °C |
Within specified limits |
| Insulation Resistance |
V – Block method for 1 minute
duration at 500 V dc |
> 103 MΏ |
Dimensions
| Watts |
Dimensions (mm) |
Resistance
Range |
| L |
W |
D |
L' |
H |
| 25W |
65 |
6 |
16 |
83 |
33 |
0.1E–3K |
| 30W |
76 |
6 |
16 |
100 |
33 |
0.1E–3 |
| 40W |
102 |
6 |
16 |
125 |
33 |
0.1E–3K |
| 40W |
102 |
6 |
16 |
125 |
33 |
0.1E–3K |
| 50W |
100 |
6 |
20 |
125 |
33 |
0.1E–3K |
| 75W |
127 |
7.9 |
25 |
170 |
40 |
0.1E–3K |
| 100W |
150 |
9.5 |
30 |
182 |
50 |
0.1E–3K |
| 150W |
175 |
9.5 |
34 |
201 |
60 |
0.1E–3K |
| 200W |
254 |
9.5 |
33 |
280 |
60 |
0.1E–5K |
| 250W |
305 |
9.5 |
30 |
345 |
60 |
0.1E–5K |
| 300W |
305 |
9.5 |
38 |
345 |
60 |
0.1E–5K |
| 400W |
305 |
9.5 |
50 |
345 |
75 |
0.1E–5K |
| 500W |
350 |
9.5 |
50 |
385 |
75 |
0.1E–5K |
| 600W |
380 |
9.5 |
76 |
420 |
75 |
0.1E–5K |
| 750W |
330 |
9.5 |
76 |
370 |
100 |
0.1E–5K |
| 1000W |
407 |
9.5 |
76 |
445 |
100 |
0.1E–5K |
| 1250W |
457 |
9.5 |
76 |
495 |
103 |
0.1E–5K |
| 1500W |
457 |
9.5 |
90 |
510 |
130 |
0.1E–5K |
