Product Overview
KOA Speer's rectangular type wirewound resistors, available in glass core (BGR) and ceramic core (BWR) variants, along with metal oxide film resistors (BSR), are designed for high-power applications. These resistors feature a flame-retardant insulated ceramic case and offer excellent resistance to pulse and inrush currents. They are compliant with EU RoHS requirements, making them suitable for a wide range of industrial and electronic applications where reliability and performance are critical.
Product Attributes
- Brand: KOA Speer
- Certifications: EU RoHS compliant
- Construction: Flame-retardant insulated ceramic case
- Core Material: Glass (BGR), Ceramic (BWR)
- Technology: Wirewound (BGR, BWR), Metal Oxide Film (BSR)
Technical Specifications
| Type | Power Rating (W) | Resistance Range () | Tolerance | Max. Overload Voltage (V) | Max. Working Voltage (V) | T.C.R. (x10-6/K) | Operating Temperature Range (C) | Weight (g/piece) |
| BWR1 | 1 | 0.1~200 | 1%, 2%, 5%, 10% | 1.3 | 250 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~1.3 |
| BWR2 | 2 | 0.1~200 | 1%, 2%, 5%, 10% | 2.1 | 300 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~2.1 |
| BWR3 | 3 | 0.1~390 | 1%, 2%, 5%, 10% | 3.9 | 350 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~3.9 |
| BWR5 | 5 | 0.1~390 | 1%, 2%, 5%, 10% | 5.1 | 500 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~5.1 |
| BWR7 | 7 | 0.1~390 | 1%, 2%, 5%, 10% | 7.5 | 700 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~7.5 |
| BWR10 | 10 | 0.1~390 | 1%, 2%, 5%, 10% | 10.2 | 1000 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~10.2 |
| BWR15 | 15 | 0.1~390 | 1%, 2%, 5%, 10% | 18.8 | 1400 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~18.8 |
| BWR20 | 20 | 0.1~390 | 1%, 2%, 5%, 10% | 23.3 | 1400 | 100 (BGR, BWR), 300 (BSR) | -40 to +155 | ~23.3 |
| BGR5 | 5 | 10~390 | 2%, 5%, 10% | 5.6 | 500 | 250 | -40 to +155 | ~6.1 |
| BGR7 | 7 | 10~390 | 2%, 5%, 10% | 5.6 | 700 | 250 | -40 to +155 | ~8.2 |
| BGR10 | 10 | 10~390 | 2%, 5%, 10% | 9.9 | 1000 | 250 | -40 to +155 | ~11.0 |
| BGR15 | 15 | 10~390 | 2%, 5%, 10% | 18.4 | 1400 | 250 | -40 to +155 | ~18.8 |
| BGR20 | 20 | 10~390 | 2%, 5%, 10% | 21.9 | 1400 | 250 | -40 to +155 | ~22.3 |
| BGR30 | 30 | 10~390 | 5%, 10% | 59.3 | 1500 | 250 | -40 to +155 | ~59.3 |
| BGR40 | 40 | 10~390 | 5%, 10% | 70.4 | 1500 | 250 | -40 to +155 | ~70.4 |
| BSR2 | 2 | 430~13k | 1%, 2%, 5%, 10% | 2.1 | 300 | 300 | -40 to +155 | ~2.1 |
| BSR3 | 3 | 430~27k | 1%, 2%, 5%, 10% | 3.9 | 350 | 300 | -40 to +155 | ~3.9 |
| BSR5 | 5 | 430~51k | 1%, 2%, 5%, 10% | 5.1 | 500 | 300 | -40 to +155 | ~5.1 |
| BSR7 | 7 | 430~56k | 1%, 2%, 5%, 10% | 7.4 | 700 | 300 | -40 to +155 | ~7.4 |
| BSR10 | 10 | 430~75k | 1%, 2%, 5%, 10% | 10.2 | 1000 | 300 | -40 to +155 | ~10.2 |
| BSR15 | 15 | 430~56k | 1%, 2%, 5%, 10% | 18.8 | 1400 | 300 | -40 to +155 | ~18.8 |
| BSR20 | 20 | 430~56k | 1%, 2%, 5%, 10% | 23.3 | 1400 | 300 | -40 to +155 | ~23.3 |
Dimensions and Construction
Refer to the provided diagrams for detailed dimensions of various styles (S, N, E, P, Z, H, Q, HA, HB, QA, QB, X, Y, YS) and types (BGR, BWR, BSR). Construction involves a flame-retardant insulated ceramic case.
Performance Characteristics
| Parameter | Requirement | Limit | Typical | Test Method |
| Resistance to Solder Heat | 350C 10C for 3.5 seconds | 1% (BWR, BSR), 2% (BGR) | 0.8% (BWR), 1.7% (BGR), 0.9% (BSR) | 260C 5C for 10 seconds |
| Moisture Resistance | Power rating x 1/10, 40C, 90-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle | 3% (BWR, BGR), 5% (BSR) | 2.4% (BWR), 2.55% (BGR), 4.5% (BSR) | |
| Endurance @ 25C or 70C | Rated voltage, 25C or 70C, 1000 hours, 1.5 hours ON/0.5 hours OFF cycle | 3% (BWR), 5% (BGR, BSR) | 2.4% (BWR), 4.25% (BGR), 4.5% (BSR) | |
| Resistance T.C.R. | Within specified tolerance | | Within specified T.C.R. | 25C / +25C/+125C |
Derating Curve
Derating curves are provided for various styles (N, E, Z, H, Q, S, X, Y, YS) and power ratings, illustrating temperature rise versus percentage of rated power at different ambient temperatures.
2504101957_KOA-BWR10CN101J_C25613657.pdf
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Ceramic core wirewound resistor KOA BWR10CN101J designed for high power and pulse current resistance Images
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