How to choose a relay 25, how to choose a relay

1。Electromagnetic relay: The coil only acts on the positive voltage, and the starting voltage of the coil is usually:

70% or 75% of rated operating voltage A; For your question, the voltage difference between -53V and -48V is 5V, and 5V is both the starting voltage: when calculating the rated voltage, A=5 70% (or 75%) calculates the rated voltage of the electromagnetic relay.

As note: The coil starting voltage of the electromagnetic relay will change accordingly with the use of the relay, and at the end of the life, the starting voltage will be larger than the initial starting voltage. In addition, due to the fixed characteristics of electromagnetic relays, it is difficult to achieve the same starting voltage and the initial accuracy is very accurate.

Therefore, if it is directly processed by the electromagnetic relay, the accuracy will be worse.

2。Solid state relay: It consists of electronic component design, which can be designed according to your requirements, and you can consider it accordingly.

If you need help, you can leave contact information at e-mail:liangfegn.

53V is a higher voltage for the relay, and even if it drops to 30 volts, it may not be released, and the voltage to be engaged can be almost doubled from the voltage that is least released. To achieve what you say, it's best to add a voltage comparison circuit and a drive circuit before the relay. This will be more stable.

You can use digital voltage relays, there are many specific models, you should buy "DC voltage relay voltage range 10-100".

53 volts can be used, the voltage fluctuation range of the relay is in %30, you can try it.

Timing relay is optional

There are many types of timing relays, and the following points should be considered when choosing:

1) Current relays of current type and voltage level, timing relay of electromagnetic damping and air damping, coil current type and voltage level should be the same as that of the control circuit; The timing relay of the motor type and transistor type should be the current type and voltage level of the power supply, which is the same as the control circuit.

2) Select the delay mode according to the requirements of the control circuit, that is, the on-delay type and the disconnection delay type.

3) Select the type and number of contacts according to the requirements of the control circuit (delayed closing or delayed disconnection) and quantity.

4) Electromagnetic damping timing relays with delay accuracy are suitable for occasions with low accuracy requirements, while electric or electronic timing relays are suitable for occasions with high delay accuracy.

5) The working frequency should not be too high, otherwise it will affect the electrical life and even lead to the incorrect setting of the delayed action.

1.Understand the necessary conditions first.

The power supply voltage of the control circuit, the maximum current that can be delivered;

voltage and current in the controlled circuit;

How many sets of contacts and what form of contacts are required for the controlled circuit. When selecting relays, the power supply voltage of the general control circuit can be used as the basis for selection. The control circuit should be able to provide sufficient working current to the relay, otherwise the relay engagement is unstable.

2.After consulting the relevant information to determine the conditions of use, you can search for the relevant information to find out the model and specification number of the relay you need. If you already have a relay on hand, you can check whether it can be used based on the information. Finally, consider whether the size is appropriate.

3.Pay attention to the volume of the device. If it is used for general electrical appliances, in addition to considering the chassis volume, the small relay mainly considers the circuit board installation layout. For small electrical appliances, such as socks and remote control devices, ultra-small relay relay products should be selected.

Relay is a commonly used controllable switching device, can achieve the purpose of weak current control strong current, widely used in the industrial control industry, automation industry, in the application of the right relay is very important, the selection of relay is generally based on the following aspects.

Electromagnetic relays are made up of coils and contacts, where:The coil is the driving endOnly after the coil has been passed through the appropriate current can the resulting magnetic field make the contacts act. Any relay will have a detailed description of the coil's parameters, including the coil's drive voltage and coil resistance. The specification table of the coil is shown in the figure below.

So choose the relay model according to the coil voltage, if your power supply is 5v, choose the relay with a coil of 5v; If the power supply is 12V, choose a relay with a coil of 12V.

The so-called contact capacity of the relay refers to the load capacity of the relay, how high the voltage the contact can withstand, and how much current can flow at the maximum. Generally, the contact capacity of the relay is required to be greater than the actual load capacity when selecting the relay, so as to prevent the relay contact from being damaged due to abnormality.

In the diagram above, 5A 250VAC and 5A 30VDC represent the load capacity of the relay contacts, and if the load capacity exceeds the rated capacity, the service life of the relay will be greatly reduced.

According to the classification of the type of relay contact, the relay can be divided into: h: a group of normally open; d, one set of normally closed; z: a set of transformations;

In addition, there are multiple groups of conversions. Select the appropriate relay according to the number of channels and status of the plant object. For example, if a relay is used to control a light, and the light is only lit when it is in motion, choose a relay with a set of normally open relays.

Wiring diagrams will be included in the relay datasheet. If you know the model, you can find the wiring diagram in the corresponding specification.

The relay has a coil and a contact, and the contact has a normally open contact (the coil is disconnected when the coil is not energized, and it is closed after being energized), and the normally closed contact (closed when the power is lost, and the electricity is disconnected).

First of all, you can judge which two contacts of the coil of the relay are, you can use the external meter DC file to measure, generally the DC relay is much larger than the DC resistance of the AC relay.

You only have one pair of contacts on 4 feet, and the other two are contacts after the coil is judged.

When the coil is energized, the electromagnetic force is used to pull down the * iron, so that the upper 4 normally closed angle contacts are separated, and the lower 4 normally open angle contacts are closed. Air switch, handle pulled, closed. The handle is pulled down and separated, which is not much different from an ordinary switch.

It's just that there is also a trip function, which automatically disconnects when overload, loss of voltage, and undervoltage. Actually, you can read these two things when you take them apart.

I hope it can help you, please give a thumbs up after the end, thank you, I wish you a safe trip and a smooth journey.

Today's car needs to give you a brief introduction to a little knowledge, that is, we have a common safety relay in our daily life, in order to prevent electric shock injury, in order to avoid overheating of the equipment, etc. , is the electrical component used. I think this is just a small part of the relay race, that is, I will give you a brief introduction to how to use a relay race to follow the car.

How to Use Relays: An Introduction.

The function of a relay is to isolate the circuit. A fully isolated circuit is used to regulate another circuit, such as a high voltage with the help of a low voltage. It is widely used.

It consists of a coil, armature, normally open contacts, and normally closed contacts.

When current flows through the coil, the armature reacts, i.e., the normally open contact closes and the normally closed contact opens to regulate the on/off of the circuit.

The picture shows a simple link diagram of the relay, in which the normally open is normally closed and the coil is connected, which is basically no problem.

It's just one structure, and each one is basically a little bit different, but the key principle is the same. If you know one principle, you can basically know it all.

Turn left|Turn right.

The function of an appliance is to isolate the circuit. A fully isolated circuit is used to regulate another circuit, such as a high voltage with the help of a low voltage. It is widely used.

It consists of a coil, armature, normally open contacts, and normally closed contacts.

When current flows through the coil, the armature reacts, i.e., the normally open contact closes and the normally closed contact opens to regulate the on/off of the circuit.

The picture shows a simple link diagram of the relay, in which the normally open is normally closed and the coil is connected, which is basically no problem.

It's just one structure, and each one is basically a little bit different, but the key principle is the same. If you know one principle, you can basically know it all.

Turn left|Turn right.

This is the end of today's introduction to Bian Xiao Automobile, and the above is a brief introduction to Bian Xiao Automobile on how to use relays. The basics mentioned above are quite basic. I hope that the Zen Sparrow friends can understand a little bit of the instinct of the pickpocket bureau and protect themselves more.

Millions of car purchase subsidies.

Measure the coil of the relay, the coil should have a small resistance value, if the resistance value is infinite, it means that the coil is open, and the relay is damaged.

When the coil is energized, the core is magnetized to generate a large enough electromagnetic force to suck the armature and drive the reed, so that the moving contact and the static contact are closed or separated; When the coil is powered off, the electromagnetic attraction disappears, the armature returns to its original position, and the moving and static contacts return to their original closed or separated state. In the application, as long as the circuit that needs to be controlled is connected to the contact, the relay can be used to achieve the purpose of control.