How to choose a good terminal block? You need to know these points!

How to choose a good terminal block? You need to know these points! The task of the wiring system is to make a reliable mechanical and electrical connection of the wires.

Terminal system: The task of the wiring system is to reliably connect the wires mechanically and electrically. Weidmüller crimping frame can effectively realize this function. The wire crimping frame is made of quenched hardened and galvanized passivated steel, and the steel screws that can withstand huge moments can firmly compress the wires. The copper conductive sheet is plated with a flexible tin-lead alloy to ensure air tightness, low resistance, and permanent connection with the wire. The following advantages of the wiring system are loved by users and are widely used:

One: The contact surface is large, and the contact pressure is large, and it can be horizontally connected at will; it has self-locking, anti-vibration, and anti-loose functions; can be installed with test sockets without maintenance; the contact points are absolutely airtight and corrosion-resistant; multi-stranded wires are not allowed The crimping terminal can be directly connected; easy to use; widely used worldwide;


Two: The contact pressure is big: In the terminal block, the contact force is one of the basic elements. If there is not enough contact pressure, no matter how good the conductive material is, it will not help. Because, if the contact force is too low, there will be displacement between the wire and the conductive sheet, resulting in oxidation pollution, increasing the contact resistance and causing overheating. Take the WDU 2.5 wire-pressing frame assembly as an example, only 0.8 Nm of torque is applied to the screw to generate an actual contact force of up to 750 N, and the magnitude of this force has nothing to do with the wire cross section. Therefore, the Weidmüller crimping frame has a permanent connection that is not affected by any environment, large contact area, and large contact force.

Three: The voltage drop is small: The voltage drop of the contact point is also one of the criteria for identifying the quality of the terminal block. Even if a small torque is applied to the screw, the value of the voltage drop is still much lower than the limit required by VDE 0611. At the same time, the applied torque changes in a wide range, and the voltage drop is almost unchanged. Therefore, although the torque used by different operators is different, it will not affect the quality of the connection. This is another proof of the reliability of the Weidmüller crimping frame.