The following factors can be considered to judge the quality of the three-phase silicon controlled rectifier module:

1. The credibility of the brand and manufacturer: Choosing products from well-known brands and manufacturers with good reputation can increase product quality assurance.
2. Technical parameters: By comparing the technical parameters of different models of silicon controlled rectifier modules, such as rated current, rated voltage, maximum reverse voltage, leakage current, etc., you can choose the product that suits your needs.
3. Rectification efficiency: The efficiency of the rectifier module determines the energy conversion loss. Generally speaking, the higher the efficiency of the silicon-controlled rectifier module, the smaller the energy conversion loss and the better the performance.
4. Safety performance: The safety of the silicon controlled rectifier module is an important indicator. When purchasing, you need to pay attention to its withstand voltage, insulation performance, temperature characteristics, and overcurrent, overvoltage, overtemperature and other protection functions.
5. Cost-effectiveness: Consider choosing thyristor rectifier modules with reasonable price and performance, and avoid products that are too expensive or have poor performance.

To sum up, judging the quality of a three-phase silicon controlled rectifier module requires comprehensive consideration of factors such as brand reputation, technical parameters, rectification efficiency, safety performance, and cost-effectiveness.