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These numbers (such as 3.5 mm, 3.81 mm, 5.0 mm, 5.08 mm, 7.5 mm, 7.62 mm) represent different spacing and are commonly used to describe the size of PCB terminal blocks. Here are some differences and common uses between them:

Ningbo HongYi Electronic Ltd Co. 3.5mm terminal blocks and 3.81mm terminal blocks: These two spacing options are typically used for smaller electronic devices and connectors, such as small power modules, sensor modules, terminal blocks, etc. They are suitable for applications that require compact layouts and limited space.

 

Ningbo HongYi Electronic Ltd Co.  5.0 mm  terminal blocks and 5.08 mm terminal blocks: These two spacing sizes are common standard sizes widely used in electronic devices and industrial control systems. They are suitable for medium-sized equipment such as power supply, PLC control, automation equipment, etc. 5.08mm terminal blocks are particularly commonly used for AC circuit connections, such as power input and relay control.

Ningbo HongYi Electronic Ltd Co. 7.5mm terminal blocks and 7.62mm terminal blocks: These two spacing options are suitable for larger equipment and high-power applications. They have larger terminal spacing and can withstand higher currents and voltages, commonly found in power sources, large mechanical equipment, and industrial automation systems.

These wiring terminals with different spacing have their respective applicable application ranges, and the choice of suitable spacing depends on specific application requirements, such as power requirements, space limitations, and electrical characteristics. When choosing, it is necessary to consider the actual situation and design requirements comprehensively.