Forward Hongfa Sanyou which relay is good

Of course, it is Hongfa relay; Hongfa relay can be called a national enterprise that wins glory for the country, the absolute leader of the domestic relay industry, and the product line is relatively complete; The only one in the country that can be compared with Tyco and Omron.

Panasonic and other high-end brands compete in all directions and are not a brand that is left behind. A shares.

The listed company, the first 600885, has annual sales of more than 90 billion, which is more than 10 times larger than that of Sanyou. Forward is much smaller. You see for yourself the market share.

Or just ask a few more users.

Each relay has its own advantages and specialties!

At present, there are many good relay brands, such as Tyco and Omron.

High-end brands such as Panasonic are quite high, followed by brands such as Hongfa, Sanyou, and Qunying Relay, mainly depending on the requirements of your product for relays.

I have personally used the products of Qunying Relay, both in terms of service and product, and there are advantages in terms of cost performance.

Their positioning mode is better, mainly for small household appliances!

Sanyou relays are exported to North America, Europe, etc., and this advantage is still worth choosing in the quality industry.

It depends on what kind of demand it has, and each manufacturer has an advantageous product. There is a specialization in the art industry!

Sanyou relay is better. Ox. Beautiful. Gree and other big brands all choose Sanyou relays.

You are welcome to add the common electrical components and symbols that electricians must understand.

You're right about the science and engineering discipline you're asking. This kind of should belong to the profession of electrical control, automation and the like.

Professional books are not as much contact as they actually are.

You can go straight to the bookstore, which has a lot of books on the subject.

It's totally possible, where there's a will, there's a way, and it's never too late for you young people to learn anything.

The book is shallow, and I never know that I have to do it. Theory plus practical operation will be better.

You went to the library to find this, and there are a lot of professional knowledge books.

It is to study chemistry, if you are good enough, you still have a chance to sign up for Dao Chemistry.

If you want to change majors, information majors are more suitable for science and engineering students. The development prospects are also considerable.

Intermediate relays.

It is used for relay protection.

It is a product that increases the number and capacity of contacts in an automatic control system, and is used to transmit intermediate signals in the control circuit. Probably for many liberal arts students who have never heard of it at all. Let's take a lookIntermediate relays and how they work

Classification of relays

According toRelaysThe role of relays in the protection loop can be divided into starting relays, measurement relays, time relays, signal relays, outlet relays and intermediate relays. Since their roles are different, they work differently. There are two main types of intermediate relays commonly used: JZ7 series and JZ8 series, the latter is AC and DC.

Intermediate relays and contactors.

The main differences:The main contact of the contactor can pass a large current, while the contact of an intermediate relay can only pass a small current. Therefore, it can only be used in control circuits.

It generally does not have a main contact because the overload capacity is relatively small. Therefore, all of the contacts it uses are auxiliary contacts, and there are more of them.

How intermediate relays work

Intermediate relays. The coil is installed on the U-shaped magnet conductor, there is an armature on the magnet, the magnet is equipped with two rows of contact monoliths on both sides, the armature is held up in the non-moving state, so that a certain gap is maintained between the armature and the magnet, when the electromagnetic moment between the air gap exceeds the reaction moment, the armature is attracted to the magnet, and the armature presses the contact shrapnel at the same time, so that the normally closed contact is disconnected and the normally open contact is closed, and you complete the transmission of the signal.

The role of intermediate relays

1. Isolation。The output signal of the control system is electrically isolated from the load side;

2. Conversion。For example, the output signal of the control system is DC24V, but the load is powered by AC220V, which is reversible for input;

3. "Amplify".。The ability of the signal output by the controller to carry a load is often limited, at the level of MA or number A, if there is a load that requires a larger current, it can only be converted by an intermediate relay;

4. Easy to maintain。Even if the output terminal meets the load current requirements, because it is integrated inside the controller, if it is damaged, it is more troublesome to replace and repair, but if the intermediate relay is passed, the load at the output end is only the coil of the relay, which reduces the load on the output stage of the controller, thereby reducing the probability of damage. When intermediate relay contacts are damaged due to frequent use, they can be easily replaced by simple plugging and unplugging.

1 group of contact A-type relays.

Type A is the normally open type.

Type B is normally closed.

Type C is the conversion type.

For example, 4C is a conversion relay with 4 sets of contacts.

The contact of the relay is in the state of normally open or normally closed, that is, it is simply understood that the contact of the switch normally open or normally closed to make the signal on or off is called the contact of the relay.

1.The two contacts are disconnected when the coil is not energized, and when it is energized, the two contacts are closed. It is represented by the pinyin prefix "h" of the ligature.

2.The two contacts are closed when the coil is not energized, and the two contacts are disconnected when the coil is energized. It is represented by the pinyin prefix "d" of hyphenation.

3.Conversion type (Z type): This is a contact set type. This contact group has a total of three contacts, i.e. a moving contact in the middle and a static contact at the top and bottom.

When the coil is not energized, the moving contact and one of the static contacts are disconnected and the other is closed, and after the coil is energized, the moving contact will move, so that the original disconnected will be closed, and the original closed will be disconnected, so as to achieve the purpose of conversion. Such a set of contacts is called a conversion contact. It is represented by the pinyin prefix "z" of the word "turn".

There is a wiring diagram on the relay, you can take a closer look. There are also numbers on the pins of the relay, and if there is no wiring diagram, you can see the function of each pin from the appearance. Generally, it is the terminal of the coil, and the one with the indicator light has polarity, and it may not light up if it is reversed.

It is the terminal block of the coil.