NKNP Non-Inductive Wound Resistors Flameproof Features: 1. Very low inductance ( less than 1 H ). 2. Flameproof painting, resistant to heat & solvents. 3. Super heat dissipation, small linear temperature coefficient. 4. Instant overload capability, low noise figure and low annual shift on resistance values.
NKNP Non-Inductive Wound Resistors Flameproof
Products | NKNP Non-Inductive Wound Resistors Flameproof |
Features | 1. Very low inductance ( less than 1 H ). 2. Flameproof painting, resistant to heat & solvents. 3. Super heat dissipation, small linear temperature coefficient. 4. Instant overload capability, low noise figure and low annual shift on resistance values. |
Electrical And Mechanical Performance of NKNP Non-Inductive Wound Resistors Flameproof:
Characteristics | Standards | Test Methods |
Resistance Tolerance | ±5%(J)or ±2%(F) | - |
Resistance Temp. Coeff. | ±300 ppm/°C | -55°C ~ 200°C |
Power Rating Load | Surface temp. 275°C Max.ΔR/R≤±2% | Rated voltage for 30 minutes |
Short Time Overioad | ±2% | 2.5 times of rated wattage for 5 seconds. |
Dielectric Withstanding Voltage | No evidence of mechanical damage or insulation breakdown.
| Applying suitable voltage listed on Dimensions for one minute. |
Insulation Resistance | 10,00MΩ | DC100V or 500V megger |
Terminal Strength
| No evidence of mechanical damage.
| < 1W:1 kg > 2W: 2.5 kg |
Solder-ability | Minimum95%coverage | 235 ± 5°C for 2 seconds |
Resistance to Soldering Heat | No evidence of mechanical damage.ΔR/R≤±1% | 270±5°C for 10 ±1 seconds 350±10°C for3.5 ±0.5seconds |
Environmental Characteristics of NKNP Non-Inductive Wound Resistors Flameproof:
Characteristics | Standards | Test Methods |
Temp. Cycle | △R/R≤±1% | -55°C( 30 min.) —►Room Temp.( 3 min.) —► +200°C( 30 min.) —► Room Tenp.( 3 min.) / ( 5 cycles) |
Load Life | △R/R≤±3% | Rated power load 90 minutes ON 30 minutes OFF 70°C 1000 hours |
Moisture-proof Load Life | △R/R≤±3% | Rated power load 90 minutes ON 30 minutes OFF 40°C95%RH500 hours |
Nonflammability | not flamed | 16 times of rated wattage for 5 min. |
Dimensions of NKNP Non-Inductive Wound Resistors Flameproof:
Rated Wattage | D±1 | L±1 | H±3 | d±0.1 | Resistance Range(Ω) | Dielectric Withstanding Voltage |
1/2W | 3.0 | 9 | 28 | 0.65 | 0.1-3 | 300V |
1W | 4.0 | 9 | 28 | 0.65 | 0.1-3 | 350V |
2W | 5.0 | 11 | 28 | 0.8 | 0.1-10 | 350V |
3W | 5.5 | 13 | 38 | 0.8 | 0.1-10 | 350V |
3WL | 5.5 | 15 | 38 | 0.8 | 0.1-10 | 350V |
5W | 6.5 | 19 | 38 | 0.8 | 0.1-20 | 350V |
6W | 8.5 | 24 | 38 | 0.8 | 0.1-20 | 500V |
7W | 8.5 | 32 | 33 | 0.8 | 0.1-20 | 500V |
8W | 8.5 | 41 | 38 | 0.8 | 0.1-20 | 750V |
10W | 8.5 | 53 | 38 | 0.8 | 0.1-20 | 800V |
Derating Curve of NKNP Non-Inductive Wound Resistors Flameproof:
For resistors operated in ambient temperatures above 70°C , power rating must be derated in accordance with the curve below.
Surface Temperature Rise of NKNP Non-Inductive Wound Resistors Flameproof: