1. Reverse parallel freewheel diodes at both ends of the coil absorb back electromotive force; 2. PCB layout: sufficient creepage distance shall be reserved for high-voltage wiring and low-voltage control line; 3. It is forbidden to frequently break the inductive high-voltage load with load; 4. It is recommended to connect a current-limiting resistor in series in the high-voltage circuit to avoid the contact being impacted by the instantaneous large current; 5. When multiple relays are used side by side, attention shall be paid to magnetic shielding to prevent the magnetic fields of adjacent relays from interfering with each other and misoperation.