Relay selection and precautions

Update:10-08-2019
Summary:

1. First understand the necessary conditions a. control […]

1. First understand the necessary conditions
a. control circuit power supply voltage, the maximum current that can be provided;
b. voltage and current in the circuit being controlled;
c. The controlled circuit needs several sets and what forms of contacts. When a relay is selected, the power supply voltage of the general control circuit can be used as the basis for selection. The control circuit should be able to provide sufficient operating current to the relay, otherwise the relay pull-in is unstable.
2. After reviewing the relevant data to determine the conditions of use, you can find the relevant information and find out the model and specification number of the required relay. If there is a relay on hand,
It can be checked according to the data. Finally consider whether the size is appropriate.
3. Pay attention to the volume of the appliance. If it is used for general electrical appliances, in addition to considering the chassis volume, small relays mainly consider the layout of the circuit board. For small appliances, such as toys and remote controls, ultra-small relay products should be used.