The detection method for relays is as follows: 1. Detect contact resistance; 2. Detect coil resistance; 3. Detect the pull-in voltage and current; 4. Measure the release voltage and release current. The function of a relay is to: 1. control high-power circuits; 2. Compose a program control circuit to achieve automated operation. The working principle of relay is to apply a certain voltage to both ends of the coil, which will generate current and electromagnetic effect. The armature will overcome the pulling force of the return spring and attract to the iron core under the electromagnetic force, driving the dynamic contact and static contact of the armature to engage. Classification of electrical appliances: 1. Electromagnetic relays; 2. Solid state relay; 3. Temperature relay; 4. Reed relay; 5. Time relay; 6. High frequency relay; 7. Instrument type relay
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