RESISTORS

RESISTORS

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