1. The drive voltage of the 12v DC relay coil should be appropriateThe coil of the relay needs to be used at the proper voltage.

2. Pay attention to the suppression of contact arc
When the mechanical contact is switched on and off with current, an arc will be generated on the contact, the arc will corrode the contact, and even cause the contact to fail. If the relay is used in the AC circuit, try to use the zero-crossing detection circuit to open the contact when it is near the zero point to reduce arcing. For the DC circuit, an RC absorption circuit can be considered to suppress arcing.
3. Do not overload the contacts

The load capacity of the mechanical contacts of the 12v DC relay is limited. The voltage and current of the control circuit must be within the load capacity range of the relay. Overloading will greatly reduce the mechanical life of the contacts.
4. The on-off frequency of mechanical contacts should not be too frequent

The contacts of the 12v DC relay have a certain speed of response when they are turned on and off. The mechanical contacts have a process of bouncing and shaking, and the response time is ms.