English
The Adjustable Wirewound Resistor from RST Electric combines the robustness of tubular power resistors with the flexibility of an adjustable tap, making it an indispensable component for engineers and maintenance professionals. At its core, this Adjustable Resistor features a high-stability resistance wire precision-wound around a high-purity ceramic tube, selected for its excellent thermal conductivity and electrical insulation properties. The element is protected by a rugged silicone coating that provides resistance to moisture, thermal shock, and industrial contaminants while maintaining excellent heat dissipation.
The key differentiator of this Power Wirewound Resistor is its adjustable lug, which can be positioned along the winding to tap into the resistance element at any point between 10% and 90% of the full value. This feature enables circuit tuning, obtaining unique resistance values not available in standard stock, and field adjustment of equipment to accommodate varying line voltages or operating conditions. The hollow core design allows secure fastening with through bolts, washers, or spring-type clips, simplifying installation in tight spaces. With power ratings spanning from 50W to an impressive 2500W, this Adjustable Tubular Resistor serves as a cost-effective solution for applications ranging from motor speed control to load bank trimming and laboratory prototyping.
As a trusted Adjustable Wirewound Resistor manufacturer, RST Electric combines over 10 years of resistor engineering expertise with rigorous quality control to deliver components that meet the demanding requirements of modern industrial and commercial equipment.
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Model Series |
RXT |
|
Rated Power |
50W – 2500W (based on 25°C free air rating) |
|
Resistance Range |
0.1Ω – 10kΩ |
|
Tolerance |
±2%, ±5%, ±10% |
|
Temperature Coefficient (TCR) |
≤ 300 ppm/°C |
|
Adjustability Range |
10% to 90% of full resistance value |
|
Power Derating |
Wattage reduces proportionally with tap position |
|
Coating Material |
Silicone / Lead-free vitreous enamel |
|
Dielectric Strength |
AC 2000V for 1 minute |
|
Working Temperature |
-55°C to +200°C (surface) |
|
Insulation Resistance |
≥ 100MΩ @ 500V DC |
|
Core Material |
High-purity ceramic tube |
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Construction |
All-welded, flame-resistant |
|
Termination |
Solder lugs / Bolt connections |
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Mounting |
Through-bolt / Spring clips / Brackets |
|
Compliance |
RoHS and CE |
1.Adjustable Lug Design – Movable tap allows fine-tuning from 10% to 90% of full resistance value, enabling circuit optimization and unique value generation.
2.Wide Power Range – From 50W to 2500W per unit, covering diverse applications from small PCB-mounted circuits to large industrial equipment.
3.Flexible Resistance Values – 0.1Ω to 10kΩ range with multiple tolerance options (±2%, ±5%, ±10%) to meet precise requirements.
4.Rugged Silicone Coating – Protective coating withstands continuous operation up to +200°C, providing resistance to moisture, thermal shock, and industrial contaminants.
5.Hollow Core Construction – Allows secure fastening with through bolts, washers, or spring-type clips for versatile mounting options.
6.All-Welded Construction – Ensures mechanical integrity and electrical reliability under vibration and thermal cycling.
7.Flame-Resistant Materials – Meets safety requirements for industrial and commercial equipment applications.
8.Power Derating Clarity – Wattage rating applies when full resistance is in circuit; derates proportionally with tap position – essential information for designers.
9.Multiple Termination Options – Available with solder lugs or bolt connections to suit various installation methods.
10.Custom Manufacturing – Special resistance values, tolerances, and mechanical modifications available for OEM requirements.
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Application |
Application details |
Description |
|
Motor Drives & Controls |
Speed Control Circuits |
Adjustable resistance for fine-tuning motor speed in industrial drives . |
|
Dynamic Braking |
Custom braking resistance values for VFD applications with unique requirements . |
|
|
Soft-start Calibration |
Field adjustment of starting current limits for large motors . |
|
|
Power Supplies |
Voltage Trimming |
Adjustable bleeder resistors for fine-tuning output voltages in prototype supplies . |
|
Load Simulation |
Variable load resistors for testing power supply performance across operating range . |
|
|
Inrush Current Limiting |
Customizable pre-charge resistance for different DC link capacitor banks. |
|
|
Test & Measurement |
Laboratory Prototyping |
Variable resistance for circuit development and experimental setups . |
|
Calibration Equipment |
Adjustable standards for calibrating ohmmeters and resistance bridges . |
|
|
Load Bank Trimming |
Fine-tuning of load bank resistance values to achieve exact power dissipation . |
|
|
Industrial Controls |
Process Controllers |
Field-adjustable setpoints for temperature, speed, and position controls . |
|
Welding Equipment |
Custom current limiting for different welding applications and materials . |
|
|
Plating Systems |
Adjustable ballast resistors for electroplating bath current control . |
|
|
Railway & Transportation |
Auxiliary Drive Controls |
Tuning of braking and control circuits in rail vehicles . |
|
HVAC Systems |
Field adjustment of fan speed controls in transit vehicles . |
|
|
Renewable Energy |
Solar Inverter Testing |
Variable load resistors for MPPT algorithm development and validation . |
|
Wind Turbine Controls |
Adjustable braking resistors for pitch control system calibration . |
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Rated power |
D±2(mm) |
L1±3(mm) |
L2±3(mm) |
L3±3(mm) |
H1±1(mm) |
B1±1(mm) |
W±1(mm) |
d±1(mm) |
Weight(g) |
|
50W |
28 |
101 |
122 |
142 |
65 |
6.4 |
8 |
4.5 |
130 |
|
80W |
28 |
151 |
172 |
195 |
65 |
6.4 |
8 |
4.5 |
210 |
|
100W |
28 |
181 |
200 |
220 |
65 |
6.4 |
8 |
4.5 |
220 |
|
150W |
28 |
226 |
245 |
267 |
65 |
6.4 |
8 |
4.5 |
260 |
|
200W |
28 |
278 |
300 |
320 |
65 |
6.4 |
8 |
4.5 |
300 |
|
300W |
40 |
267 |
306 |
342 |
90 |
8.00 |
10 |
6 |
560 |
|
400W |
40 |
330 |
369 |
405 |
90 |
8.00 |
10 |
6 |
660 |
|
500W |
50 |
330 |
347 |
363 |
103 |
7.00 |
10 |
6 |
870 |
|
700W |
50 |
330 |
347 |
363 |
103 |
7.00 |
10 |
6 |
870 |
|
800W |
60 |
330 |
354 |
380 |
120 |
8.4 |
15 |
6.5 |
2130 |
|
1000W |
60 |
430 |
454 |
480 |
120 |
8.4 |
15 |
6.5 |
1800 |
|
1500W |
60 |
430 |
454 |
480 |
120 |
8.4 |
15 |
6.5 |
1800 |
|
2000W |
70 |
430 |
449 |
490 |
133 |
9.00 |
15 |
6.5 |
2400 |
|
2500W |
80 |
430 |
453 |
490 |
150 |
9.00 |
15 |
6.5 |
2800 |
RST Electric is a Chinese manufacturer that has been dedicated to the research and production of adjustable wirewound resistors for over 10 years. It is an experienced manufacturer of adjustable resistors in the industry and not a trade intermediary. We offer customers factory direct supply prices with high cost-effectiveness and transparent costs without any hidden charges.
We independently control the entire process from ceramic core procurement, winding, coating, to the assembly of adjustable connection pieces. Each step is strictly controlled to ensure the stable quality of each Adjustable Wirewound Resistor and eliminate the quality differences caused by outsourcing of each link, making customers' purchases more放心.
RST Electric has an ISO 9001-certified factory equipped with dedicated winding and adjustable tap assembly production lines. The process is standardized, with each step supervised by dedicated personnel to ensure that the products meet strict standards.
Before each product leaves the factory, 100% electrical testing is completed, focusing on testing multiple tap resistance values, dielectric strength and insulation performance, along with internal thermal verification to ensure that the power reduction within the adjustable range is reasonable. An experienced engineering team can provide customized resistance solutions for various industries.
RST Electric is a trusted supplier for motor drives, power supplies, and testing equipment worldwide. Our products are exported to 40+ countries including Germany, the United States, Japan, South Korea, and Italy. We have profound experience in the field of on-site adjustable resistors.
We can precisely understand the needs of different scenarios and provide more adaptable products, helping customers optimize the performance of their equipment. We have accumulated rich experience in global supply and industry application.
We offer comprehensive customization services. There is no need for customers to modify the equipment themselves. We can flexibly meet various personalized needs.
The power can be upgraded from 50W to 2500W as needed. The resistance value can range from 0.1Ω to 10kΩ and can be customized specially. The tolerance, adjustable range, coating, wiring and installation method can all be customized to meet the requirements of different devices.
The standard model of RST Electric has a delivery period of 3-5 working days, while the customized model has a delivery period of 7-10 working days. This ensures that it does not affect the production progress of the customers.
Each batch of Adjustable Wirewound Resistor comes with complete technical documentation and is provided with a 18-month warranty, including remote fault diagnosis, spare parts delivery, and integrated technical support. This ensures the full protection of the customers throughout the process.
Address
No. 13, North Shore Road, Huangjiang Town, Dongguan City, Guangdong Province, China
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