Ask for an internship report of the electrical appliance factory The main products of the electrical

Halo Electrical appliances and electrical appliances are not equal.

Foreign joint venture brands: the most famous: Schneider, ABB, Siemens (these manufacturers have their own switch + contactor thermal relay production).

Domestic: state-owned Changshu, Shanghai people, Zhengtai, Delixi. (These manufacturers have their own switch + contactor thermal relay production).

1. Circuit breaker (micro circuit breaker, molded case circuit breaker), which plays the role of power switch and overload tripping in electricity, is an indispensable electrical product for civil and industrial electricity.

2. AC contactor in AC 220V, 380V electrical, play the role of indirect start of electrical equipment, it is composed of the main contact, auxiliary contact, voltage coil and installation base several parts, it is usually used for the start of fans, pumps, motors, AC contactors must be used with thermal relays, indicator lights, buttons and other electrical components.

3. Thermal relay, generally can not be used independently, it must be used with AC contactor or DC contactor, it is generally only in the secondary line until the thermal protection function, as long as the secondary line encounters a short circuit, heating phenomenon, it will directly drive the coil of the contactor, so that the contactor trips.

4. The fuse is used at the front end of the electrical secondary line, which plays the function of overcurrent, short circuit and quick break of the line.

Brand selection: circuit breakers, AC contactors, thermal relays and other major electrical components, suitable for the user's economic conditions to choose, in the Chinese market good quality joint venture products are: Schneider, ABB, Siemens, GE, Legrand, Admiralty Muller and other well-known brands, domestic products are:

Changshu switch factory, Tianshui.

Two. One. 3. Chint Electric, Delixi Electric, Tianzheng Electric, Beijing Tomorrow Electric, Beijing People's Electric, Tianjin Jinlow Electric, Shanghai Lean Electric, etc.

Joint venture products: common models of Schneider molded case circuit breakers (NSX series, NSE series, EDD series), common models of Schneider miniature circuit breakers (C65N series, EA9 series); Common models of ABB molded case circuit breaker (T160 630 series, S2N160, S5N630 series); ABB miniature circuit breaker commonly used models (S250 series, S260 series, S280 series). Domestic miniature circuit breaker selection (DZ47 series), molded case circuit breaker (NM1 series).

Description: The current level of molded case circuit breaker usually varies from 10A to 630 current, and the high current also has 800A and 1250A grades (but it is rarely used), and the current level of miniature circuit breaker usually ranges from 1A to 63A, and the high current is 80A, 100A, and 125A is the maximum.

Matters to be noted in use: the ambient temperature is between -20 degrees and +40 degrees, and the altitude is 2000 meters, as long as the environment is not very harsh, it can generally meet the requirements of use; Civil circuit breakers generally have small current requirements, and the circuit breakers between 1A and 63A can fully meet the requirements of households and civil use, and molded case circuit breakers are generally used in industrial, mining, and residential power distribution rooms. The current can be converted according to the actual power demand, usually in kW (kilowatts) to measure the load capacity of the equipment, for specific selection criteria, please refer to the (low-voltage electrical general manual) Volume I, II, III.

1. The difference between contactors, circuit breakers and relays:

1. The role is different

The primary role of the relay is to detect, transmit, convert or dispose of the signal, and the circuit current it opens and breaks is generally small, and it is generally used in the control circuit to control weak signals.

The primary function of the contactor is to turn on or off the main circuit. The main circuit refers to whether a circuit works or not is marked by whether the circuit is turned on or not. The main circuit concept corresponds to the control circuit. Generally, the current passed through the main circuit is larger than that of the control circuit.

The contacts of the relay are generally not divided into main and auxiliary; The contacts of relays are sometimes set in pairs, that is, the normally open and normally closed contacts are combined, while the contactors are not set in pairs; Relays will be combined with other equipment for specific needs, such as time relays, counters, pressure relays, etc., which have additional functions, while contactors generally do not.

2. The opening and closing of the contacts are not the same

In addition, the contactor is used to turn on or off the load with high power, and is used in the (power) main circuit, and the main contact can have interlocking contacts to indicate the opening and closing of the main contact.

Relays are generally used in electrical control circuits to extend the contact capacity of miniature or small relays to drive larger loads. For example, the contacts of the relay can be used to turn on or off the coil of the contactor. Generally, relays have more opening and closing contacts, of course, relays can also complete some special functions through appropriate connection, such as logical operations.

2. There is no connection between the contactor, the circuit breaker and the relay in terms of structure and working principle.

Difference 1: Contactor: a non-manual operation mechanical switch electrical that can turn on, carry and break the current under normal circuit conditions. The load that can realize long-distance control and frequent on-off is mainly used for motor start and shutdown control. It is a kind of control switch.

2. Circuit breaker: it can turn on, carry and break the current under normal circuit conditions; It can also be turned on and carried for a certain time and a kind of mechanical switching current under specified abnormal conditions. It can realize overload and short-circuit protection, which is mainly used for load and short-circuit protection, and is a kind of protection switch.

3. Relay: It is used for the control circuit, a relay often has several pairs of normally open and normally closed nodes, which can be used for different control loops, and its nodes cannot pass through large currents, and are generally not used for power circuits; A contactor is similar to a circuit breaker.

It is used to control the switching on or cutting off of strong current, which is mainly used in power circuits. Relays, contactors should be said to be the same type of devices, through the coil to achieve the effect of small current to control large current, and circuit breaker is commonly said to be an automatic switch, is a kind of switching device, which has the effect of breaking the load current.

Both circuit breakers and contactors are used to turn circuits on and off.

ContactorContactor refers to an electrical appliance that uses a coil to flow through an electric current to generate a magnetic field and close the contact to control the load. The contactor consists of an electromagnetic system (core, static core, solenoid coil), a contact system (normally open contacts and normally closed contacts) and an arc extinguishing device. The principle is that when the electromagnetic coil of the contactor is energized, a strong magnetic field will be generated, so that the static iron core will produce electromagnetic attraction to attract the armature and drive the contact action

Normally closed contact disconnects; The normally open contacts are closed, and the two are linked. When the coil is de-energized, the electromagnetic attraction disappears, and the armature is released under the action of the release spring, so that the contact is restored: the normally closed contact is closed; Normally open contacts are disconnected.

Circuit breaker circuit breaker is divided into high-voltage circuit breaker and low-voltage circuit breaker according to its scope of use, and the division of high and low voltage boundaries is relatively blurred, and generally more than 3kV is called high-voltage electrical appliances. Low-voltage circuit breaker, also known as automatic switch, commonly known as air switch, also refers to low-voltage circuit breaker, which is a kind of electrical appliance that not only has the function of manual switching, but also can automatically carry out loss of voltage, undervoltage, overload, and short circuit protection. It can be used to distribute electrical energy and start asynchronous motors infrequently.

It protects power lines and motors, and automatically cuts off circuits when they have serious overloads, short circuits, undervoltages, etc., and its functions are equivalent to the combination of fuse-type switches and over/under-heat relays. In addition, it is generally not necessary to change parts after the fault current is broken, and it has been widely used.

A relay relay is an electrical control device. It has an interactive relationship between the control system (also known as the input loop) and the controlled system (also known as the output loop). Usually used in the control circuit of automation, it is actually an automatic switch that uses a small current to control the operation of a large current.

Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

Personal insights, I hope you find them helpful.

The investment is mainly store decoration, you can pay after selling the goods, it is best to get a store, the purchase is generally from the provincial level of the first business, the business is big in another plan, the most needed is the switch, socket, air switch, plastic shell switch and the like. Wire is the most profitable.

Generally, everyone sells whatever brand you have, mainly depending on what type of ** or store you sign with the manufacturer; The product can be lifted directly from the manufacturer, but the capital demand will be relatively large, this is a large ** business, a small store can find a **suitable ** business, I heard that the store is about 1 million, to press some goods; What components to enter depends on what are the target customers you operate, civil words are micro-breaks, 10 40A is used at most, 6KA or, C curve, industry is not easy to say, the prepared products will be more complicated.

Does the landlord have a market? Domestic Zhengtai, Delixi, relatively good, foreign Siemens, Schneider, ABB, abb is more expensive, Schneider is more common, but it is not cheap, a 400 A circuit breaker has thousands, if the landlord is retail, the brand should have no restrictions, but the profit is definitely very small.

If you buy it, there is a ** reference. Automation network, there are all kinds of electrical manufacturers, as for what components, this is a series, such as Schneider's, one of his components can be derived from multiple components, circuit breakers, contactors, thermal relays, relays, and various auxiliary contacts, many, many, or please check carefully.

There is no bounty, you lose manually.

The entry point is to find the procurement personnel of the relevant companies and carry out some [underground] activities in a targeted manner, so as to win them over and become friends with them. That's what makes it possible to drive sales. Otherwise, everything else is.

This involves company secrecy that cannot be said

1.Consider whether the power supply is single-phase or three-phase; 2.power selection of the device; 3.the size of the installation space; 4.Launch control; 5.**Device selection; 6.Wire configuration.

The first floor has been said in a complete way, and I would like to add one more point: the circuit breaker should also be selected to consider the maximum possible short-circuit current that can reliably break the circuit.

matching, e.g. voltage, current, e.g.

The rated current of a motor is 30A, and the circuit breaker should be about 75A. The contactor should be selected 63A