Cement resistor
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Product Description
- 产品描述
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A cement resistor is a special type of resistor. Despite its name, it does not actually contain cement. The name comes from its packaging material – refractory clay (or fire clay) – used to encapsulate the resistor. Cement resistors primarily consist of a resistive wire (wirewound or metal oxide film) as the core, along with packaging filler, solder lug leads, and a ceramic shell. Some products also include an external metal bracket.
Features
High Power: Cement resistors can withstand high power levels. Common power ratings include 1W, 2W, 5W, and even higher, reaching hundreds of watts. This allows them to handle large currents.
Large Size: Compared to other types of resistors, cement resistors are relatively large and typically use a vertical or horizontal package.
Low Precision: Due to the significant heat generated by high power, cement resistors have poor thermal stability, so their precision is usually set within a range of ±2%, ±5%, ±10%, etc.
Good Temperature and Heat Resistance: Cement resistors have good temperature and heat resistance and high insulation, ensuring that combustion and other safety hazards do not occur during use.
Shockproof, Moisture-proof, and Corrosion-resistant: Cement resistors have excellent shockproof, moisture-proof, and corrosion-resistant properties, suitable for various harsh environments.
Applications
Because cement resistors can withstand high power and high current, they are widely used in various applications that require current limiting or as load outputs. Specific applications include:
Motor Starting: In motor starting, cement resistors are often used as starting resistors.
Power Supplies: Used in various power supply products, such as switching power supplies and regulated power supplies.
Instruments and Equipment: Used in various instruments and equipment as load outputs or current limiters.
Household Appliances: Widely used in air conditioners, televisions, and other household appliances.
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