Terminal blocks have been widely used in various industries such as inverters and controllers since their creation. Due to the diversity of terminal types and the broad range of applications, there are no detailed torque specifications for screws during terminal installation, which requires users to determine based on specific circumstances.
Installation torque in terminal connectors is primarily evident in plug-in terminals with screw components and grid terminals. It is usually found under the terminal specifications as a larger locking torque option, which many customers do not understand. For instance, in LC17-5.08, the locking torque related to the screw is 0.5-0.6 Nm, with screw specifications M3 for two items. The larger locking torque essentially refers to torque, indicating that a M3 specification screw is used, and 5-6 Newtons of force is required at a distance of 0.1 meters from the terminal to securely tighten the screw. Over-tightening can lead to thread damage, while insufficient force may cause loosening during operation.
In the UK series terminals, there are clear specifications for the torque requirements that the terminals must meet. Torques within this range will not damage the product and allow for normal operation. Taking the UL-UK2.5B terminal as an example, in the IEC60947-1 standard of the world terminal industry, it explicitly stipulates that the copper components of the product must meet a torque of 0.8N. Therefore, we can use this as a standard in the application of our products and adopt a torque of 0.8N, ensuring low loss rates in actual use.
Beyond the screws, controlling force in terminal connectors also involves the application of force on the plastic components. The primary function of the plastic parts is to snap into the track, securing the terminal itself. However, due to the cold winter weather and decreased air humidity, the product's durability is compromised. Therefore, we should pay special attention to this aspect during use. We should gradually increase pressure and stop once we hear a "snap," ensuring the product's normal operation.
