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We offer a comprehensive portfolio including resistors, braking units, reactors, power filters, and transformers, with full customization options to meet diverse application requirements.
DUFEW CRR Series Corrugated Resistors are designed for demanding industrial applications, including VFD braking systems, power electronics load testing, dynamic braking, and circuit protection. With high power capacity, excellent heat dissipation, and long service life, they deliver stable and reliable performance in harsh operating environments.
The resistive element is manufactured from high-quality nickel-chromium (Ni-Cr) or constantan alloy ribbon, precision-wound into a corrugated profile by automated equipment and edge-mounted onto a high-frequency hollow ceramic core. It is securely fixed with stainless steel clamps to improve vibration resistance and mechanical stability, while heavy-duty stainless steel terminals provide excellent corrosion resistance and reliable electrical connections.
For enhanced durability, the resistor surface is coated with an environmentally friendly UL94V-2 flame-retardant insulating coating that is smoke-free, non-toxic, oxidation-resistant, and highly resistant to moisture and aging. Manufactured in accordance with GB-5792 standards, the products support both horizontal and vertical installation, allowing flexible integration into electrical control cabinets or standalone resistor assemblies.
| Model Code | Meaning | Description |
| CRR | Series | Corrugated Resistor |
| 2500W | Rated Power | 2500W |
| 54.4R | Rated Resistance | 54.4Ω |
| J | Resistance Tolerance | J = ±5% (Optional: K = ±10%, H = ±3%) |
| Parameter | Specification |
| Power Range | 50W–10KW |
| Operating Voltage | ≤1200V |
| Resistance Range | 0.01Ω–1KΩ |
| Resistance Tolerance | ±3% / ±5% / ±10% |
| Protection Rating | IP00 |
| Temperature Coefficient (TCR) | ≤300 ppm/°C |
| Flame Retardant Rating | UL 94V-2 |
| Compliance Standard | GB/T 5792 |
1: Insulating Core: Utilizes a high-frequency hollow ceramic tube offering excellent high-temperature resistance, structural rigidity, and shock resistance, ensuring the stability of the resistor element under high-temperature operating conditions.
2: Resistance Element: Employs high-quality nickel-chromium or constantan alloy ribbon, characterized by a low temperature coefficient and high overload capacity. The corrugated edge-wound design maximizes heat dissipation surface area while minimizing inductance.
3: Mounting and Terminals: Stainless steel clamps secure the resistance ribbon to prevent displacement or loosening; terminals are made of stainless steel with thickened construction and surface treatment, ensuring corrosion resistance, rust prevention, and ease of connection.
4: Surface Coating: Features an eco-friendly green insulating coating with strong adhesion and a UL94V-2 flame-retardant rating. It is corrosion-resistant, smoke-free, non-toxic, and odorless, effectively protecting the resistance ribbon from oxidation and extending service life.
5: Overall Structure: Power ratings range from 50W to 10KW, with resistance values from 0.01Ω to 1KΩ and operating voltages up to 1200V; the corrugated edge-wound ribbon structure combines low inductance with high precision.
●Corrugated edge-wound structure offering large heat dissipation area and excellent thermal stability
●High-frequency hollow ceramic core; high-temperature resistant, robust, and shock-resistant
●High-quality alloy resistance wire; low temperature coefficient (≤300 ppm/°C) and high precision
●Strong short-term overload capability; withstands 10x rated power for 5 seconds without visible damage
●Stainless steel terminals; corrosion-resistant, rust-proof, and reliable connections
●Eco-friendly coating; flame-retardant and corrosion-resistant; smoke-free, non-toxic, and odorless
●Rigorous performance validation; fully compliant with standards for withstand voltage, damp heat, and thermal shock
●Compliant with GB-5792 standards; reliable quality
Braking resistors for variable frequency drives (VFDs); protective resistors for servo drives; resistive loads for power electronics testing; sampling resistors for power supply circuits; current-limiting resistors for motor drives; starting resistors; circuit protection resistors. Widely used in equipment across industries such as elevators, port machinery, rolling mills, cranes, winches, injection molding machines, wire drawing machines, centrifuges, textile machinery, printing and dyeing equipment, stacker-reclaimers, papermaking machinery, stage equipment, and testing systems.
| Electrical Characteristics | Test Conditions | Performance |
| Dielectric Withstand Voltage | 2500VAC / 50Hz / 60s | Leakage current ≤10mA |
| Insulation Resistance | 1000VDC | Insulation resistance ≥100MΩ |
| Short-Time Overload | 10× rated power for 5s | No visible damage |
| Long-Term Load Life | Cyclic power-on test (10s energized, 90s off) | >9,000 hours |
| Steady-State Damp Heat | 40°C ±2°C, 90%–95% RH, 100h | ΔR ≤ ±(1%R + 0.05Ω) |
| Rapid Temperature Change | -55°C, 55°C, 155°C, 15 min at each temperature, 5 cycles | ΔR ≤ ±(2%R + 0.05Ω) |
| Heat Resistance | 350°C / 2h | No obvious discoloration or damage |
| Temperature Coefficient (TCR) | Resistance under rated load compared with static resistance | ≤300 ppm/°C |
| Flame Resistance | 10× rated power for 5 min | Red-hot without open flame |
| Mechanical Characteristics | Test Conditions | Performance |
| Terminal Strength | 45N / 30s | No looseness or visible damage |
| Vibration Resistance | 5–200Hz, 1g, 98m/s² | No visible damage to external structure |
| Resistance to Soldering Heat | Lead terminals immersed in 350±5℃ solder for 3s | ΔR ≤ ±(1%R + 0.05Ω); no visible external damage, markings remain clear |
| Solderability | Terminals immersed in 235±5℃ solder for 5s | Solder coverage on terminal surface ≥95% |
| Comparison Criteria | Corrugated Resistor | Conventional Carbon Film / Metal Film Resistor |
| Power Handling | Designed for high-power applications, 50W–10kW; withstands 10× rated power for short-duration overloads | Typically 0.1–20W; easily damaged under overload conditions |
| Temperature Resistance & Service Life | Withstands temperatures up to 350°C; cyclic service life exceeds 9,000 hours | Lower heat resistance; resistive film tends to age and peel under prolonged high temperatures |
| Current Capacity | Suitable for high-current applications, motor braking, regenerative discharge, and load dumping | Primarily designed for low-current PCB signal circuits |
| Inductance Characteristics | Standard models have higher inductance; non-inductive corrugated versions are available | Coil-free design with very low inductance, suitable for high-frequency low-power circuits |
| Environmental Durability | Ceramic core with stainless steel terminals provides excellent vibration and shock resistance | Thin-film structure has weaker adhesion and is more susceptible to vibration-induced failure |
| Cost Efficiency | Highly cost-effective for high-power applications; higher cost for low-power ratings | Low cost for low-power applications; expensive and less practical for high-power requirements |
Q1: How do I select a resistor with the appropriate power rating?
A: Select a resistor with a rated power 1.5 to 2 times the actual power consumption in the circuit. Also, consider power derating due to ambient temperature; a higher power rating is required for high-temperature environments.
Q2: Is it normal for the resistor surface temperature to be very high?
A: DUFEW Corrugated Resistors convert electrical energy into heat during operation, so a high surface temperature is normal. Ensure the installation location is well-ventilated and free of flammable materials. If the temperature is abnormally high, check for overload or an undersized power rating selection.
Q3: What is the recommended installation method for the resistors?
A: The product supports horizontal or vertical installation; horizontal mounting is preferred to facilitate natural convection cooling. Ensure sufficient clearance around the resistor body (generally at least the diameter of the resistor) and avoid mounting it flush against cabinet walls or other heat-generating components. If multiple resistors are installed side-by-side, the spacing between them should be at least 50mm.
Q4: What are the resistance tolerance grades for the CRR series, and how do I choose?
A: The DUFEW CRR series offers three tolerance grades: Class K (±10%), Class J (±5%), and Class H (±3%). Class J (±5%) is generally sufficient for industrial braking and load applications; for precision measurement or sampling circuits, Class H (±3%) is recommended for higher accuracy.
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