How to choose the right terminal blocks for your project? We provide an in-depth analysis of five key factors: current and voltage, installation method, environmental adaptability, material structure, and certification standards, to help engineers and purchasing personnel make precise selections and reduce failure rates and maintenance costs.
I. Matching Electrical Parameters: Current, Voltage, and Safety Margin
1. Rated Current
When selecting terminal blocks, it's crucial to consider not only the nominal current of the equipment but also peak current, long-term load, cable cross-sectional area, and the impact of ambient temperature. It is recommended to leave a 20%-30% current margin to ensure stable long-term operation.
2. Rated Voltage
Different applications have different voltage requirements: low-voltage control systems typically use 300V, industrial power systems often use 600V or higher, and new energy systems can reach 1000V. Creepage distance and electrical clearance design should also be considered.
II. Wiring Method Selection: Screw-type or Spring-type?
1. Screw Terminal Block
Suitable for high-current applications, such as power distribution cabinets and industrial control boxes, but requires regular inspection to prevent loosening.
2. Spring Terminal Block
Suitable for automation control systems and vibrating environments, offering maintenance-free and vibration-resistant advantages.
3. Pluggable Terminal Block
Suitable for PCB connections and modular designs, facilitating installation and maintenance.
III. Environmental Adaptability: Do Not Underestimate the Working Environment
When selecting connectors, working temperature, protection rating, and vibration conditions must be considered. For high-temperature environments, high-temperature resistant nylon (PA66) material is recommended. In dusty or humid environments, attention should be paid to the IP protection rating and corrosion resistance.
IV. Material and Structural Design: Determining Long-Term Stability
High-quality terminal blocks typically use copper or tin-plated copper conductors and insulation materials that meet the UL94 V-0 flame retardant rating. Oxidation and corrosion resistance directly affect long-term operational safety.
V. Certification and Compliance: A Crucial Aspect for Export Projects
Common international certifications include UL, CE, TUV, IEC, and RoHS. For export projects, certification not only affects customs clearance but also relates to project acceptance and legal compliance.
When selecting components, engineers should consider ease of maintenance, modular expandability, and inventory standardization. Proper terminal selection not only improves system stability but also reduces long-term maintenance costs. Stable connections are fundamental to reliable system operation; although small, terminal blocks are crucial connecting components in electrical systems. Correct selection can reduce failure rates, extend equipment lifespan, and enhance overall brand reliability.
1. Screw connection: This method uses screw terminals to connect wires. It is important to consider the maximum and minimum wire cross-sections allowed, as well as the maximum torque for different screw sizes.2. Soldering connection: The most common soldering method is tin soldering. It is essential to ensure that a continuous metal connection is formed between the solder material and the surface being soldered. Different types of soldering connections include solder tab style, eyelet solder tab style, and arc notch solder tab style.3. Crimp connection: Crimping is a technique where metal is compressed and displaced within specified limits to connect wires to contact pairs. Good crimp connections can produce metal intermolecular flow, resulting in symmetrical deformation of the wire and contact material. This type of connection is similar to cold welding and can withstand harsh environmental conditions.4. Wrapping connection: Wrapping involves wrapping the wire directly around the angular contact pillar. The wire is wrapped, pressed, and fixed at the angular contact pillar to create a sealed contact.
When using PCB terminal blocks for wiring applications, it is important to keep in mind the following precautions:1. Always ensure that the power is switched off before starting any wiring operations. Never attempt to work on the terminal blocks while they are live. If you are unsure whether the power is off, use a voltage tester to verify. Additionally, if there are sliding buttons on the terminal blocks or switches, it is advisable to replace them if they are worn out to prevent any risk of electric shock.2. When connecting to the power source, make sure to install PVC conduit for wire routing. Avoid leaving wires hanging loosely without any proper support or fixation on support brackets or busbars.3. Pay attention to the length of the wires when connecting to the switch box. It is recommended to keep the wire lengths within a suitable range and properly route them through conduits. Avoid pushing the wires directly into the switches for fixing.By following these precautions, you can ensure safe and efficient operation of the PCB terminal blocks. If you have any further questions or need assistance, please feel free to contact us.
English
English
Deutsch
Español
عربي
हिंदी
Contact Us
IPv6 network supported