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What is the function and principle of relay

What is the function and principle of relay

2021-09-15

The use of relays in our home is very important, which can provide the most basic life guarantee for home life. However, we should also pay attention to the use of relays to avoid unnecessary troubles. Then what is the function and principle of relay, and the correct use of relay, do you understand? Now let's find out.

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What does a relay do? What does a relay do

What does a relay do? What does a relay do

2021-09-15

Relay is a kind of electric control device, is when the change of the input quantity to meet the specified requirements, in the electrical output circuit to make the controlled quantity of a predetermined step change of an electrical appliance.

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Types of new relays

Types of new relays

2021-09-15

The new relay refers to the electromagnetic relay developed and produced in order to meet the new special requirements and meet the use under special environmental conditions. Its main characteristics are small volume, light weight, vibration resistance, shock resistance, load range from low level load to 5A, 28V rated load, and the product has reliability index (failure rate level) requirements. The product adopts resistance fusion welding or laser fusion welding sealing air-tight sealing structure, mainly used in electronic control equipment signal transmission and weak current power switching.

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Reliability of relay

Reliability of relay

2021-09-15

The impact of environment on the reliability of relays: the average time between failures of relays working in GB and SF is the highest, reaching 820000 hours, while in NU environment, it is only 60000hours.

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Types of relays

Types of relays

2021-09-15

There are many types of relays, which can be divided into voltage relay, current relay, time relay, speed relay and pressure relay according to the input quantity, electromagnetic relay, induction relay, electric relay and electronic relay according to the working principle, and control relay and protection relay according to the purpose. According to the input quantity change form can be divided into whether there is a relay and measuring relay.

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Symbolic representation of relays

Symbolic representation of relays

2021-09-15

The relay coil is represented in the circuit by a long box symbol, and if the relay has two coils, two long boxes are drawn side by side. At the same time, mark the relay word symbol "J" in or beside the long box. There are two ways to represent the contacts of relays: one is to draw them directly on one side of the long box, which is more intuitive.

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Test of relay

Test of relay

2021-09-15

Measure contact resistance: use the electric barrier of a multimeter to measure the resistance of normally closed contact and moving point, and the resistance value should be 0; The resistance of normally open contact and moving point is infinite. So you can tell that one is a normally closed contact and that one is a normally open contact.

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Take you to understand the principle and use of intermediate relay, thermal relay, time relay and solid state relay

Take you to understand the principle and use of intermediate relay, thermal relay, time relay and solid state relay

2021-09-15

A relay is an electrical control device that can give a specified input and hold it long enough to cause a predetermined step change in the controlled quantity in the electrical output circuit. When the input is reduced to a certain level and maintained for a long enough time, it can be restored to the initial state.

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Classification of relays

Classification of relays

2021-09-15

Electromagnetic relay: An electrical relay that uses the suction force generated by the current in the input circuit between the core of an electromagnet and the keeper.

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Relay main product technical parameters

Relay main product technical parameters

2021-09-15

Rated operating voltage: It refers to the voltage required by the coil when the relay is working normally. It can be AC voltage or DC voltage depending on the type of relay.

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