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Cement Resistors: Rugged Performance for Your Electronics

In environments where heat, humidity, and high currents pose a challenge, standard resistors are often insufficient. This is where cement resistors come into play. As your specialist for electronic components, alfatec GmbH & Co. KG, in partnership with the renowned manufacturer Royalohm, offers a broad portfolio of high-quality cement resistors. These are specifically designed to deliver stable and reliable performance even under the most demanding conditions. 

Our Range: Cement Resistors for Every Requirement

Thanks to Royalohm’s manufacturing expertise, we offer a wide variety of cement resistors, distinguished by their form factor and specific properties for different applications. All types listed here are available through alfatec. 

 

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Axial Cement Resistors 

The classic form for through-hole mounting (THT). These resistors are versatile and easy to handle and integrate into existing circuit layouts. 

  • Power Range: Typically from 2W to over 25W
  • Resistance Values: Wide range from 0.1Ω to 150KΩ
  • Special Feature: Excellent pulse load capacity and mechanical stability 

Radial Cement Resistors 

With leads on one side, these resistors are ideal for PCB-mounted applications where space optimization is key. They offer high packing density. 

  • Power Range: Typically 5W to 25W
  • Form Factor: Space-saving, vertical mounting
  • Special Feature: Also available in high surge versions for added protection against voltage spikes 

Thermally Fusible Cement Resistors (Fusible Resistors) 

These intelligent components combine the function of a power resistor with that of a thermal fuse. In case of overheating, they safely interrupt the circuit, protecting downstream electronics from damage. 

  • Function: Operate as a resistor under normal conditions and as a fuse in fault conditions
  • Application: Ideal for power supplies and charging circuits where safety is paramount 

Power Flat Alloy Resistors 

These specialized cement resistors use a flat resistance element made of a metal alloy. They are designed for applications requiring very high power dissipation in a compact space. 

  • Form Factor: Flat, compact housing 
  • Advantage: Excellent heat dissipation and high pulse resistance 
Advantages and Special Features at a Glance
High Temperature Resistance: The cement casing reliably protects the component from overheating
Excellent Pulse and Overload Capability: Can absorb high energy pulses without damage
Fire Resistance: The housing is non-flammable, providing a high level of safety
Mechanical Robustness: Resistant to vibration and mechanical shock
Moisture Resistance: The dense cement housing protects the internal element from environmental influences
Outstanding Price-Performance Ratio: Royalohm delivers top industrial quality at competitive prices
Application Areas
Power Supplies: As pre-resistors, in snubber circuits, or for current limiting
Drive Technology: In frequency converters and motor controllers for brake energy management
Household Appliances: In washing machines, air conditioners, and fan heaters for power regulation
Automotive Electronics: As pre-resistors for fan motors or in charging systems
Industrial Controls: In automation systems requiring high reliability
Audio Technology: In passive crossover networks for loudspeakers

Technical Features and Materials in Focus

Royalohm cement resistors are known for their robustness, achieved through careful material selection and thoughtful design: 

  • Resistive Element: The core is a high-quality resistance wire or metal alloy, precisely wound onto a ceramic core or formed as a flat element. This design ensures even heat dissipation. 
  • Housing: The resistive element is embedded in a special cement compound. This housing is electrically insulating, highly heat-resistant, and non-flammable, ensuring high operational safety. 
  • Terminals: Axial or radial leads are securely connected to the resistive element to ensure long-term reliable contact. 

Key Technical Parameters: 

  • Rated Power (W): Defines the maximum continuous load 
  • Resistance Value (Ω): Available in a wide range for various circuits 
  • Tolerance (%): Indicates permissible deviation from the nominal value, typically ±5% or ±10% 
  • Temperature Coefficient (ppm/°C): Describes resistance change with temperature variation 

Our partner in the field of cement resistors

Logo Royalohm

Royalohm

Our partner Royalohm, one of the most renowned manufacturers of electrical resistors in the world, impresses with over 40 years of experience. With production facilities in Thailand and China, they control the entire manufacturing process. They also ensure continuous innovation in various application areas through in-house R&D developments.

 

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See the quality and performance of our cement resistors for yourself. Request a non-binding quote today or download the data sheets.

alfatec – your partner for high-quality electronic components

As your expert partner for electronic components, alfatec supports you in selecting the right cement resistors for your applications. We offer comprehensive advice and are happy to answer any questions you may have about power modules.

Do you have questions about our cement resistors or would you like a personal consultation? Feel free to contact us.