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In the production of DIN rail terminal blocks, the choice of metal hardware has a substantial impact on overall product performance. Among commonly used materials, brass, pure copper and iron each possess unique characteristics that shape the performance of both screw-type and spring-type terminal blocks.

Electrical Conductivity

Pure Copper

Famous for its outstanding electrical conductivity, pure copper is the top choice when low resistance is essential. In high-current applications, pure copper terminal blocks ensure efficient power transmission, reducing energy loss and heat buildup. For example, pure copper screw terminal blocks deliver stable and reliable electrical connections in heavy-current power distribution systems.

Brass

As a copper-zinc alloy, brass has lower conductivity than pure copper, yet still provides adequate performance for most general electrical uses. It is widely adopted in terminal blocks for household appliances and low-to-medium current industrial control circuits.

Iron

Iron features relatively poor electrical conductivity. Using iron as a conductive component in terminal blocks can lead to high resistance, overheating and potential connection failures, so it is seldom used directly for electrical conduction in standard terminal block designs.

Mechanical Properties

Iron

Iron offers excellent mechanical strength and hardness. This makes it suitable for applications where terminal blocks are exposed to high mechanical stress. In harsh industrial environments, iron-reinforced spring terminal blocks maintain structural stability under vibration, shock or high-torque fastening.

Brass

Brass provides good mechanical performance, with moderate strength and high ductility. It can be easily formed into complex shapes during manufacturing, enabling sophisticated designs such as precision screw-clamping structures in screw terminal blocks.

Pure Copper

Although pure copper excels in electrical performance, it is softer than both brass and iron. Pure copper terminal blocks are more likely to deform under high mechanical stress. With proper design, however, this softer property helps create tight and reliable electrical contact.

Corrosion Resistance

Brass

Thanks to its zinc composition, brass has better corrosion resistance than pure copper. In humid or corrosive environments, brass terminal blocks resist oxidation and corrosion for longer periods, making it ideal for outdoor electrical equipment and high-humidity installations.

Pure Copper

While pure copper develops a protective oxide layer over time, it is more prone to corrosion in acidic or alkaline environments. Special coatings or surface treatments are often required to improve its durability in harsh working conditions.

Iron

Iron is highly susceptible to corrosion, especially in moist and oxygen-rich environments. Without proper protection such as galvanizing or painting, iron terminal blocks rust and degrade quickly, resulting in poor electrical connections and weakened mechanical strength.

Conclusion

Pure copper is the ideal material for DIN rail terminal blocks requiring high conductivity. Brass delivers a well-rounded combination of good electrical performance, mechanical strength and corrosion resistance, making it perfect for general applications. Iron is mainly used where high mechanical strength is the primary requirement, though it usually needs extra anti-corrosion treatment.