Electrical performance: mainly includes contact resistance, insulation resistance and dielectric strength. A high-quality electrical connector should have a low and stable contact resistance. Insulation resistance is a measure of the insulation performance between terminal contacts and between contacts and the housing. Dielectric strength is voltage resistance and dielectric voltage resistance.

Appearance: The appearance of the qualified terminal is well worked, the surface is flat, there is no scratch, the corners are no burrs, and the wall thickness is uniform. The fit degree between the plug and the pin holder should be high, and the problem of too high or too low inserting and pulling force should not occur.

Raw materials: plastic parts should have good flame retardant, whether the wire frame (conductive parts) is copper, copper conductivity is stronger.

Screw torque: The screw torque of the terminal is very important and can be tested by taking samples in person.

Wiring range: Different terminals, the size and wiring range are not the same, in general, when using terminals, it is recommended to choose a wiring range slightly larger than the actual wire diameter. Because the current market standard is relatively chaotic, if you choose the wiring aperture of the same size as the wire diameter, it may be because of the confusion of the standard, resulting in a smaller wiring range, and the line cannot be inserted into the wire frame.

Load current and voltage: The power is selected according to the load current and voltage, and the terminal with space is selected.

Space: In a small space, only relatively small terminals can be selected, and the fixed method is the rail type. The size of the terminal itself plus the size of the guide rail will be greater than the size of the wiring space, and can only be fixed by other methods.

When selecting terminal blocks, consider the above factors based on actual requirements and conditions to ensure that the terminal blocks selected can meet your requirements and ensure safe and reliable operation.