Introduction
The terminal types of micro switches mainly determine how the wires are connected to the switch, which directly affects the installation method, speed, reliability, and applicable scenarios. There are three common terminal types: welded terminals, plug-in terminals, and threaded terminals. Choosing the appropriate terminal is essential to enable the micro switch to perform its best in the equipment.
The main differences among the three types of terminals
Welded terminals require the use of an electric soldering iron and solder to weld the wire onto the metal pins of the terminal, ensuring a stable connection. This connection method is very strong and sturdy, has low resistance, stable electrical connection, strong shock resistance, and a small volume. It is suitable for printed circuit board installation, scenarios requiring high reliability and vibration resistance, products with large-scale automated production, and equipment with limited space. While welded terminals have these advantages, they also have certain disadvantages. Installation and disassembly are complex and time-consuming, with poor flexibility. The high temperature during welding may cause damage to the plastic components or contact springs inside the switch.
Plug-in terminals are easy to use. First, press the flat or fork-shaped plug onto the wire, then insert the plug directly into the corresponding plug-in socket on the switch. The contact is maintained by the spring force. Without welding, it can be installed and disassembled "one plug and one pull", saving a lot of time during maintenance and replacement. It is often used in household appliances such as washing machines and microwave ovens. However, it requires a dedicated plug-in terminal and a wire harness made with a crimping pliers. If the plug is of poor quality or not pressed properly, it may loosen over time. In areas with extremely high vibration, its reliability is inferior to welded and threaded terminals.
Threaded terminals insert the bare copper wire stripped of the insulation at the end of the wire into the terminal hole or press it under the terminal block, then tighten the screw on the terminal with a screwdriver to clamp and fix the wire. It does not require additional plug-in terminals and can connect single or multiple strands of wires. It is suitable for on-site installation in industrial control cabinets, motors, and other high-current equipment. To replace the wire, simply loosen the screw. Maintenance and debugging are very convenient. However, the installation speed is slower than that of plug-in terminals. Pay attention to the force when tightening the screw. If it is too loose, it may come off; if it is too tight, it may damage the wire or the screw. If used in a vibrating environment, a style with a lock washer will be more reliable.
Conclusion
For multi-strand wires, a wire nose should be added to prevent the copper wire from spreading and causing poor contact.
Post time: Aug-28-2025
