Flameproof wire wound resistors TyoHM KNP 3W 33R J T B with excellent heat dissipation and low noise
KNP Series Wire Wound Resistors
The KNP series wire wound resistors are flameproof, offering excellent electrical and mechanical performance with superior heat dissipation and a low linear temperature coefficient. They provide instant overload capability, low noise figures, and minimal annual shift in resistance values. Compared to enamel types, these resistors are flameproof, lightweight, and more cost-effective. The winding wires are significantly more durable than those in high-temperature produced enamel types.
Product Attributes
- Brand: KNP Series
- Type: Wire Wound Resistors, Flameproof
- Certifications: JIS C 5201-1
Technical Specifications
| Characteristic | Specification | Test Method |
| Resistance Tolerance | 5% (J) or 1% (F) | - |
| Resistance Temp. Coeff. | 1% 300 ppm / R/R 3% R/R 3% 2% | - |
| Power Rating | 1/4W~1W, 2W, 3W(3WL), 4W~10W | - |
| Load Short Time Overload | 10 times of rated wattage for 5 seconds | - |
| Dielectric Withstanding Voltage | Applying suitable voltage listed on Dimensions for one minute. | - |
| Insulation Resistance | DC100V or 500V megger | > 1,000M |
| Terminal Strength | 2W 2.5 kg | - |
| Solder-ability | 1 kg | - |
| Resistance to Soldering Heat | 275 5 for 2 seconds | - |
| Temp. Cycle | -55 (30 min.) Room Temp.( 3 min.) +200 ( 30 min.) Room Temp.( 3 min.) / ( 5 cycles) | - |
| Load Life | Rated power load 90 minutes ON 30 minutes OFF 70 1000 hours | - |
| Moisture-proof Load Life | Rated power load 90 minutes ON 30 minutes OFF 40 95% RH 1000 hours | - |
| Nonflammability | 16 times of rated wattage for 5 min. | No evidence of flame |
Dimensions and Ordering Information
| Rated Wattage | D (mm) | L (mm) | H (mm) | Resistance Range () | Dielectric Withstanding Voltage |
| 1/4W | 3.0 | 6.8 | 0.6 | 0.1~200 | 250V |
| 1/2W | 4 | 9 | 0.65 | 0.1~300 | 350V |
| 1W | 5.0 | 9 | 0.65 | 0.1~500 | 350V |
| 2W | 5.5 | 11 | 0.8 | 0.1~1K | 500V |
| 3W (3WL) | 5.5 | 13 | 0.8 | 0.1~1K | 500V |
| 5W | 6.5 | 15 | 0.8 | 0.1~1.2K | 500V |
| 6W | 8.5 | 19 | 0.8 | 0.1~1.2K | 500V |
| 7W | 8.5 | 24 | 0.8 | 0.1~1.5K | 500V |
| 8W | 8.5 | 32 | 0.8 | 0.1~1.5K | 500V |
| 10W | 8.5 | 41 | 0.8 | 0.1~2.2K | 800V |
How to order: Composed of Type, Rated Wattage, Nominal Resistance, Tolerance, and Package. e.g., KNP 1W 10R J T/B. Note: For resistors operated in ambient temperatures above 70C, power rating must be derated in accordance with the derating curve.
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