Relay symbol

Photocoupler

Guide: The relay is an automatic switching component with isolation function. It has been widely used in remote control, communication, automatic control and other circuits. Then the problem comes. If the competitors encounter the relay in the circuit, they will recognize it. Does it come? Children who don’t know it pay attention to it. This article mainly explains the relay symbol. After reading this article, you are no longer strange to the relay in the circuit~~

First, the relay symbol - - Introduction

The relay, whose English name is relay, is an electrical control device that changes the output by a predetermined step when the input quantity changes to the required level. The relay is composed of a coil and a contact, and is often used in an automatic control circuit to function as an automatic adjustment, safety protection, and conversion circuit. Relays can be divided into intermediate relays, voltage relays, current relays, time relays, etc., and we will explain their symbols separately.

Second, the relay symbol - - intermediate relay

The intermediate relay, the English name is intermediate relay, is a component for converting and transmitting control signals. The input signal is the energized power-off signal of the coil, and the output signal is the action of the contact. Intermediate relays are commonly used in relay protection or automatic control systems to increase the number and capacity of contacts. The intermediate relay symbol is shown below:

Third, the relay symbol - - voltage relay

Voltage relay, the English name is Voltage relay, is an electronic control device that controls large current through a small current. It has a control system and a controlled system. It is usually used in automatic control circuit to automatically adjust and protect. , conversion circuit, etc. The voltage relay symbol is shown below:

Fourth, the relay symbol - - current relay

The current relay, the English name is Currennt trasformer, is also an electronic control device. The current relay works according to the current signal, and the contact action is determined according to the magnitude of the coil current. The current relay symbol is shown below:

Five, relay symbol - - time relay

The time relay outputs a signal after a predetermined delay from the time the input signal is obtained. The time relay can be divided into a power-on delay relay and a power-off delay relay according to different delay modes. Wherein, after the power-on delay relay receives the input signal for a period of time, the output signal changes, and after the input signal disappears, the output signal is immediately reset, and the text symbol is KT, and the graphic symbol is as shown in the following figure:

After the power-off delay relay receives the input signal for a period of time, the output signal changes. After the input signal disappears for a period of time, the output signal is reset, and the text symbol is also KT. The graphic symbol is as shown below:

Relay symbol