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Rx24 Gold Aluminum Shell Resistor 47KΩ 50W - High Power Wirewound with Heat Sink

Name: Rx24 Gold Aluminum Shell Resistor 47KΩ 50W - High Power Wirewound with Heat Sink
Brand: Guangdong Qingda Electronic Technology Co., Ltd
SKU: jrKRqcoCLmke
Price: 0.50 USD
Availability: InStock

US$0.50-2.00 100 Pieces (MOQ)

Port:

Zhuhai, China

Payment Terms:

L/C, T/T

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Guangdong Qingda Electronic Technology Co., Ltd

Guangdong, China

Last Login Date:

Aug 04, 2025

Main Products:

Resistor, High Voltage Resistor, Resistance Box, RF Resistor, High Precision Resistor, High Power Resistor

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Product Description

Company Info

Basic Info.

Model NO.

47KOhm 50W

Resistance

Fixed Resistor

Function for Resistance

Load Resistor

Material

Ceramic and Metal

Packaging

Throught Hole

Shape

Button Shape

Product Description

I. Main Models and Parameter Comparison Table

Power Rating	Model	Resistance Range	Withstand Voltage	Temperature Rise Limit	Protection Class	Typical Applications
5W	RX24-5W	0.01Ω-1kΩ	350V	+275ºC	IP00	Medical Device Voltage Stabilization
50W	RXLG-50W	0.2Ω-33kΩ	800V	+315ºC	IP54	Servo Motor Current Limiting
200W	RXLG-200W (20R)	20Ω ±5%	1600V	+375ºC	IP65	Tower Crane Braking Systems
500W	RXLG-500W (50R)	50Ω ±1%	2000V	+400ºC	IP54	Photovoltaic Inverter Pre-charging
1000W	RXLG-1000W (75R)	75Ω ±2%	2500V	+420ºC	IP65	Marine Power Distribution Systems
3000W	RXLG-3000W (50R)	50Ω ±0.5%	3000V	+450ºC	IP67	Industrial Inverter Energy Braking

II. Key Technical Features

Structural Innovations
- Utilizes 6063-T6 aerospace-grade aluminum alloy hard anodizing process, increasing surface heat dissipation area by 60% compared to traditional designs.
- 500W models employ nano-grade alumina ceramic substrate technology, reducing volume by 40%.
- 1000W+ models integrate ceramic wirewound resistors + silicon nitride thermal conductive adhesive, achieving a thermal equilibrium time constant of 150 seconds, with optional integrated temperature monitoring modules.
Dynamic Performance
- 200W models support 10× instantaneous overload (2000W for 6 seconds).
- 3000W marine-grade models pass 72-hour salt spray tests, compliant with DNV-GL marine standards.
Safety Certifications
- Full series standard 3000V withstand voltage test, leakage current <0.25mA.
- Medical-grade 5W models meet IEC 60601-1 3rd Edition safety requirements.

III. In-Depth Industry Applications

Precision Electronics (5W-50W)
- Gold-plated aluminum case process ensures surface contact resistance <0.02mΩ, ideal for high-precision current sensing circuits.
New Energy Systems (200W-1000W)
- Dual-helix winding structure achieves ultra-low inductive reactance (0.5μH/cm²), optimized for IGBT fast-switching applications.
Heavy Machinery (2000W-3000W)
- Modular design supports multi-unit series configurations (e.g., 3000W/50Ω can be formed by 6×500W units).

I. Core Parameter Overview

Parameter	Value	Technical Analysis
Origin	Guangdong, China	A major hub for electronic component manufacturing in China, with highly mature supply chains.
Brand	QD	Specializing in Industrial Braking Systems - High-Reliability Braking Resistor Product Line
Resistance Range	0.1Ω ~ 100kΩ	Covers scenarios from low-voltage/low-current to high-voltage/high-current (e.g., servo systems require low resistance, cranes require high resistance).
Power Range	0.1W ~ 100kW	Suitable for applications ranging from microdevices to heavy industrial equipment. The 100kW class supports large inertia loads like cranes.
Tolerance	±1%	Exceeds the standard ±5% tolerance, ideal for precision braking control (e.g., CNC machines).
Package Type	Aluminum casing	Features corrugated aluminum alloy casing with 30% increased surface area for enhanced heat dissipation, vibration resistance (IP55), and flame retardancy.

II. Key Technical Features

Extreme Temperature Adaptability
- Operating Temperature: -80°C ~ 250°C
- Utilizes aerospace-grade ceramic coating technology for stable performance in low-temperature (e.g., cold storage) or high-temperature environments (e.g., smelting equipment).
Dynamic Braking Performance
- Supports Fly Lead connections to reduce contact resistance and improve high-frequency braking response.
- Combined with aluminum casing heat dissipation, withstands short-term 300% overload power surges (refer to Test Data on Page 9).
Customization Capability
- Non-standard resistance/power customization available for special conditions (e.g., explosion-proof braking resistors for rail transit).
- 2025 production batches use new alloy materials, extending lifespan by 40% compared to traditional products.

III. Selection Guidelines

Resistance Calculation
Rmin=VbusImax(Typical value: 710V/20A→35.5Ω)R_{min} = \frac{V_{bus}}{I_{max}} \quad (\text{Typical value: } 710V/20A → 35.5Ω) Rmin=ImaxVbus(Typical value: 710V/20A→35.5Ω)
Select critical resistance based on the inverter's DC bus voltage and braking unit's maximum current.

Power Matching

Scenario	Recommended Power Coefficient (10s braking cycle)	Notes
Non-repetitive braking (<1/hr)	0.2-0.3	Multiply calculated power by 0.2
Repetitive braking (production)	0.5-0.7	Add heat sinks or forced cooling

Failure Alerts
- If DC bus overvoltage occurs, first check for excessive resistance causing discharge delays.
- Investigate braking frequency exceeding design margins if temperature exceeds 130°C.

IV. Typical Application Comparison

Application	Recommended Model	Technical Advantages
Elevator braking systems	50Ω/5kW (aluminum casing)	Suppresses voltage fluctuations, ensures leveling accuracy (±2mm).
EV regenerative braking	0.5Ω/20kW (liquid-cooled)	Supports transient high-current discharge; cycle life >100,000 cycles.
Tunnel boring machine emergency stops	100kΩ/100kW (air-cooled)	IP68-rated for humid tunnel environments.

Note:

Contact QD for complete technical specifications and the latest product manual.
Actual selection requires dynamic simulation verification based on inverter models, load inertia, and other parameters.

Selling Point

1.Premium quality: This dynamic braking resistor is crafted with premium-grade aluminum metal clad construction, ensuring durability and long-lasting performance.

2.High power capacity: Equipped to handle a maximum power of 2500W, this resistor is ideal for various industrial and engineering applications that require robust, high-powered resistance.

3.Wide resistance range: Offering a resistance range of 0.1Ω to 100KΩ, this versatile resistor caters to diverse application needs, providing adaptability and flexibility in various settings.

4.Accurate resistance tolerance: Boasting precise resistance tolerance of ±1%, ±2%, ±5%, or ±10%, this resistor guarantees consistent, reliable performance, enhancing overall system efficiency.

5.Enhanced safety features: Designed with safety in mind, this brake resistor features a robust, durable aluminum casing, protecting against potential damage and ensuring safe, reliable operation.

Company Introduction

Guangdong Qingda Electronic Technology Co., Ltd. was established in 2011, and it has since become a leading source of world-class resistors and inductors in China. Recognized as a national high-tech enterprise and designated for its expertise in Zhuhai, the company boasts a 6,000 square-meter production facility and adheres to ISO 9001 and ISO14001 management systems. With a proud legacy of more than 20 years of dedicated R&D, marketing, sales, and service experience, Qingda has cultivated strategic partnerships with renowned state-owned and central enterprises.

Pioneering its path in the industry, Qingda has secured its position as a trusted supplier for both domestic and international clients. It currently satisfies the needs of nearly 5,000 customers across an impressive variety of industries. The company's outstanding products have been exported to 50 countries and regions, such as Europe, North America, South America, and Asia, and are well represented in industries like new energy vehicles, wind power generation, photovoltaic power generation,rail transit, frequency converters, servo systems, CNC machinery, elevators, robotics, power supplies, and marine transportation. They also cater to the defense sector, aviation, data centers, communication and telecommunications, academic institutions, and research centers.

For over two decades, the company has strived to build long-lasting relationships with customers, suppliers, and employees alike, fostered by a sense of camaraderie and dedication. Qingda is committed to fulfilling social responsibility and cultivating a spirit of craftsmanship, not just to achieve customer satisfaction, but also employee satisfaction and social recognition.

FAQ

1. who are we?
We are based in Guangdong Province, China, start from 2011,sell to Southern Europe(60.00%),Eastern Europe(15.00%),North America(10.00%),Southeast Asia(10.00%),Western Europe(5.00%). There are total about 51-100 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Braking Resistors/High Voltage Resistors,Wirewound Resistors/Power Resistors/Water Cooled Resistors,Variable Resistors/Wirewound Rheostat RF resistor,Load Banks/film resistor Inductor Carbon Film Resistence,potentiometer Shunt Resistor Cement Resistor

4. why should you buy from us not from other suppliers?
Qingda,was founded in 2005, it is one of the first-class resistors and Inductor with international competitiveness in China. It is a national high-tech enterprise and .We have 20 years of experience in design and research and development.

5. what services can we provide?
Accepted Delivery Terms: EXW;
Accepted Payment Currency: USD,EUR;
Accepted Payment Type: MoneyGram,Credit Card,Cash;
Language Spoken: English,Chinese

Address: No. 2357 Huxin Road, Zhuhai, Guangdong, China

Business Type: Manufacturer/Factory

Business Range: Consumer Electronics, Electrical & Electronics

Management System Certification: ISO 9001

Main Products: Resistor, High Voltage Resistor, Resistance Box, RF Resistor, High Precision Resistor, High Power Resistor

Company Introduction: Guangdong Qingda Electronic Technology Co., Ltd was founded in 2011, it is one of the first-class resistors and Inductor with international competitiveness in China. It is a national high-tech enterprise and Zhuhai specialized, special & new enterprise. The production plant covers an area of 6000 square meters.

Qingda continues to implement ISO 9001, ISO14001 management system, with nearly 20 years of professional R & D experience as well as marketing, sales and service experience. We have long-term cooperation with many state-owned enterprises and central enterprises, such as ZTE, , CMIE, CRRC, etc. Also we are the supplier for well-known customers, , and have cumulatively served nearly 5, 000 customers.

Products are exported to 50 countries and regions such as Europe, North America, South America, and Asia, etc., covering industrial control, braking and equipment fields such as new energy vehicles, wind power generation, photovoltaic power generation, rail transit, frequency converters, servo, CNC, elevators, robots, power supplies, ships and docks; The applications of military industry, aviation, data center, communication, telecommunications, universities, colleges and research institutes, etc.

After nearly 20 years of struggle, Qingda has integrated with its customers and suppliers with its humanistic feelings, social responsibility, craftsman spirit, and has also achieved customer satisfaction, employee satisfaction and social satisfaction.

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