The judgment of whether the china 12vdc relay is good or bad is very simple. As long as you check according to the following steps, you can usually make a quick judgment:

1. Use a multimeter 2K resistance gear to measure the relay coil. The china 12vdc relay depends on the contact working current and size, and the coil resistance is also different. The larger the volume, the larger the coil wire diameter and the smaller the resistance value, and vice versa. On the contrary, it is generally about tens to hundreds of ohms. The specific value cannot be judged by the naked eye only, and a certain amount of experience is required.

2. Connect the china 12vdc relay coil terminal to the 12V DC power supply. If it can be closed normally, the relay coil is good.

3. Observe whether the outer skin of the china 12vdc relay coil is discolored, and whether the discoloration is caused by high-temperature baking caused by the internal heating of the coil.

4. Observe whether the dynamic and static contacts of the china 12vdc relay have ablation, discoloration or even adhesion, if necessary, disassemble the shell and lightly press the armature with your fingers to observe whether the dynamic contact is sensitive to the movement between the two static contacts of normally open and normally closed , Whether the contact is reliable or not, if there are multiple sets of contacts, check them one by one.

If no obvious abnormality is found after the above inspection, it can be determined that the china 12vdc relay is good and can be used normally.