How to choose the 4-pin relay correctly? First of all, to understand another problem, it is first necessary to conduct a thorough investigation and in-depth understanding of the nature, characteristics and requirements of the control circuit of the relay controlled object.

Secondly, the various characteristics of the 4-pin relay itself, such as principle, working conditions, technical parameters, structural technical characteristics, specifications and models, should be fully grasped and carefully analyzed. Secondly, according to the principle of value engineering, from the perspective of advancement, rationality, availability and economy, correctly select and use the 4-pin relay.
1. The main technical performance of the relay, such as contact load, working time parameters, mechanical life, electrical life, etc., should meet the requirements of the entire system;
2. The structure type (including installation method) and external dimensions of the relay should meet the requirements of operating conditions.
3. Economic rationality.
The above three points are the general principles for selecting general-purpose relays.