Main test items of relays

The main test items are briefly described as follows: (1) action value. Voltage required for relay operation. (2) Contact resistance. The resistance value between two contacts when the electric shock is closed. (3) Mechanical life. The number of times the relay repeatedly switches on and off without damage to the mechanical part. (4) contact voltage. When the electric shock is closed, a certain load current and voltage between contacts are applied in the electric shock loop. (5) Electrical life. When the rated voltage is applied at both ends of the relay drive coil and the rated resistive load is applied in the contact loop, the reliable operation times of the relay are less than 300 cycles per hour and the duty cycle ratio is 1:4. (6) Overload capacity. When the rated voltage is applied at both ends of the relay drive coil and 1.5 times the rated load is applied in the contact loop, the frequency of operation is (10±1) times/min.