What are the functions of Relays commonly used in industry?

Jan. 09, 2020

Relays are a kind of electrical appliances commonly used in the industry. We all know that relays are automatic control electrical appliances that operate according to specific input signals. There are many types of relays, including intermediate relays, thermal relays, and time relays. As a Power Relay Supplier, share with you.

KM Relay is usually used to transmit signals and control multiple circuits simultaneously. It can also be used to directly control small-capacity motors or other electrical actuators. The structure and working principle of the intermediate relay are basically the same as those of the AC contactor. The main difference with the AC contactor is that there are more contacts, and the contact capacity is small, and only small currents are allowed to pass. When selecting the intermediate relay, the voltage level and the number of contacts are mainly considered.

19F Relay

19F Relay

FR thermal relay has a large metal expansion coefficient in the lower layer and a small expansion coefficient in the upper layer. When the current in the main circuit exceeds the allowable value and the bimetal is heated, the free end of the bimetal is bent upward beyond the buckle plate, and the normally closed contact is opened by the buckle 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.

KT time relay power-on delay air type time relay uses the damping effect of air to achieve the purpose of action delay. After the attraction coil is energized, the armature is sucked down, so that there is a distance between the armature and the piston rod. Under the action of the release spring, the piston rod moves downward. A rubber film is fixed on the surface of the umbrella piston. When the piston moves downwards, a thin space of air will be created on the top of the film. The piston cannot be moved down quickly due to the pressure of the air below. When air enters through the air inlet, the piston moves down gradually. When moved to the final position, the lever activates the micro switch. The delay time is the period from the moment when the electromagnet attraction coil is energized to the moment when the micro switch operates. The delay time can be adjusted by adjusting the size of the air inlet through the adjustment screw.

After the suction coil is powered off, it is restored by the action of the return spring. The air is quickly expelled through the air vents. At this time, the relay has two time-delay contacts: one is a normally-closed contact that is open-delayed, one is a normally-open contact that is closed-delayed, and there are two momentary contacts.

Electrical industry profile technical characteristics and current status

19F Relay is an electrical control device, which is an electrical device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity reaches the specified requirements. It has an interactive relationship between the control system and the controlled system. Usually used in automated control circuits, it is actually an "automatic switch" that uses small currents to control high current operations. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. We also have MK Relay on sale, welcome to consult.


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