Products › Wirewound Resistors › Fusible Wirewound Resistors
Fusible Wirewound Resistors
- Fusing and circuit protection
- Good lightning-surge resistance
- Good heat resistance, high load power
- Low TCR, low noise, non-flammable
- Tolerance: ±1%, ±2%, ±5%
Applications: Industrial control, automotive electronics, household appliances, medical equipment, electric meters
Dimensions & Specifications
| Rated Power: Standard | Rated Power: Miniature | φD (mm) | L (mm) | H (mm) | φd (mm) | Resistance Range |
|---|---|---|---|---|---|---|
| 1/4W | 1/2WS | 2.3±0.5 | 6.0±1.0 | 27±3.0 | 0.4±0.1 | 1Ω–47Ω |
| 1/2W | 1WS | 3.5±0.5 | 9.0±1.5 | 25.0±2.0 | 0.50±0.1 | 1Ω–47Ω |
| 1W | 2WS | 4.5±1 | 11.5±1.5 | 24.0±2.0 | 0.60±0.1 | 2.2Ω–120Ω |
| 2W | 3WS | 5.0±1 | 15.0±1.5 | 27.0±2.0 | 0.65±0.1 | 2.2Ω–120Ω |
| 3W | 5WS | 6.0±1 | 15.5/17.5±1.5 | 32±3.0 | 0.70±0.1 | 2.2Ω–120Ω |
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Fusing Characteristics: Voltage Fusing
| Rated Power Multiple | R < 2Ω: Fusing Time | 2–10Ω: Fusing Time | R > 10Ω: Fusing Time |
|---|---|---|---|
| 16 times | ≤60 seconds | ≤45 seconds | ≤30 seconds |
| 25 times | ≤60 seconds | ≤30 seconds | ≤15 seconds |
| 32 times | ≤30 seconds | ≤15 seconds | ≤10 seconds |
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Fusing Characteristics: Current Fusing
| Rated Power | Resistance Range | Rated Current Multiple | Fusing Time |
|---|---|---|---|
| 1/4W | R < 2Ω | 6 times | ≤30 seconds |
| 1/4W | R ≥ 2Ω | 8 times | ≤30 seconds |
| 1/2W–3W | R < 2Ω | 5 times | ≤30 seconds |
| 1/2W–3W | R ≥ 2Ω | 6 times | ≤30 seconds |
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If the rated voltage exceeds the maximum working voltage, use the maximum working voltage.
Fusing current calculation: confirm with the manufacturer. After fusing, resistance is at least 100 times its initial value.
Electrical Characteristics
| Test Item | Technical Requirements | Test Conditions / Standard |
|---|---|---|
| Operating temperature range | -55°C to +155°C | |
| Temperature coefficient | ±350ppm/°C (±500ppm/°C for R < 1Ω) | Test temperature: room temperature +100°C |
| Short-time overload | ±(1%+0.05Ω) | 2.5 times rated voltage for 5 seconds |
| Temperature cycling | ±(5%+0.1Ω) | -55°C to +155°C, 5 cycles |
| Moisture resistance under load | ±(5%+0.1Ω) | 40°C, 95%RH; rated voltage applied for 1.5 hours ON, 0.5 hours OFF, for 1000 hours |
| Load life | ±(5%+0.1Ω) | 70°C; rated voltage applied for 1.5 hours ON, 0.5 hours OFF, for 1000 hours |
| Solderability | Coverage of at least 95% | 255°C for 3 seconds |
| Resistance to soldering heat | ±(1%+0.05Ω) | 350°C for 3 seconds |
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Test standard: GB/T5729 (JIS5202)
Technical Details
Load Derating Curve
Y axis: Rated Power (%)
X axis: Ambient Temperature (°C)
Product Structure
- A: End cap
- B: Ceramic core
- C: Resistance wire
- D: Insulating coating
- E: Color-code bands
- F: Lead
- G: Identification band
White identification band: wirewound fusible resistor
