What are the common functions of industrial control relays

Update:08-04-2022
Industrial control relay is a common relay in the industry. It is a current-limiting protection device with delayed action. It generally refers to thermal relays. Thermal relays are protective appliances used for overload protection of motors or other electrical equipment and electrical lines. The lower metal expansion coefficient of the thermal relay is large, and the expansion coefficient of the upper layer is small.

When the current in the main circuit exceeds the allowable value and the bimetal is heated, the free end of the bimetal will bend upwards beyond the gusset, and the gusset will disconnect the normally closed contact under the tension of the spring. The contact is connected to the control circuit of the motor. When the control circuit is disconnected, the coil of the contactor is de-energized, thereby disconnecting the main circuit of the motor. Time relay power-on delay Air-type time relay uses the damping effect of air to achieve the purpose of delaying action.

After the suction coil is energized, the armature is sucked down, so that there is a distance between the armature and the piston rod. The piston rod moves downwards under the action of the release spring. A layer of rubber film is fixed on the surface of the umbrella piston. When the piston moves downward, a thin air space will be created on the film, and the piston cannot move down quickly due to the pressure of the air below. When the air enters from the intake hole, the piston moves down gradually. When moved to the final position, the lever actuates the microswitch.

The delay meter base parts time is the period of time from the moment when the electromagnet attracting coil is energized to when the micro switch operates. The delay time can be adjusted by adjusting the size of the air intake hole by adjusting the screw.After the suction coil is powered off, it is restored by the action of the return spring. The air is quickly exhausted through the air outlet. This time relay has two delay contacts: one is a normally closed contact with a delay opening, the other is a normally open contact with a delay closing, and there are two momentary contacts.
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