What are the typical low voltage power distribution appliances

Fuses, contactors,Leakage protectorand relays, etc.

Low-voltage appliances. It is a kind of component or equipment that can manually or automatically turn on and off the circuit according to the external signals and requirements, so as to realize the switching, control, protection, detection, transformation and adjustment of the circuit or non-electrical objects.

Introduction

According to the level of its working voltage, the control appliances can be divided into two categories: high-voltage control appliances and low-voltage control appliances, with AC 1200V and DC 1500V as the boundary.

In general, low-voltage electrical appliances can be divided into two categories: distribution appliances and control appliances, which are the basic components of complete sets of electrical equipment. In the industrial, agricultural, transportation, national defense and people's electricity sectors, most of them use low-voltage power supply, so the quality of electrical components will directly affect the reliability of low-voltage power supply system.

Power distribution appliances are mainly switches (knife switches, knife transfer switches, fuses, circuit breakers, etc.);

Control appliances are all kinds of controllers (contactors, starters, resistors, rheostats, electromagnets, master appliances, control relays, etc.).

Knife switches, circuit breakers, contactors, voltmeters, ammeters, transformers,

Fuses, terminal blocks, pushbutton switches, thermal relays, and more.

Circuit breakers, contactors, thermal relays.

Hello, common low-voltage electrical appliances include switches, fuses, contactors, leakage protectors and relays, etc. 1. Switch an electronic component that can open a circuit, interrupt the current, or make it flow to other circuits. The most common switches are human-operated electromechanical devices with one or more electronic contacts.

The "closed" of the contact indicates that the electronic contact is turned on, allowing current to flow through; The "open" of the switch indicates that the electronic contacts do not turn on to form an open circuit, which does not allow current to flow through. 2. The fuse fuse melts the melt with its own heat after the current exceeds the specified value for a period of time, so that the circuit is disconnected; A kind of current protector made by using this principle. Fuses are widely used in high and low voltage power distribution systems and control systems and electrical equipment, as a short-circuit and over-current protector, is one of the most widely used protection devices.

3. Contactor contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used in electricity, distribution and electricity occasions. Contactor in a broad sense refers to the electrical appliances that use the current flowing through the coil to generate a magnetic field and close the contact to control the load in industrial electricity. The contactor has a large control capacity, which is suitable for frequent operation and long-distance control, and is one of the important components in the automatic control system.

In industrial electrical, there are many models of contactors, and the working current ranges from 5A to 1000A, and its use is quite extensive. 4. Relay relay (English name: relay) is an electrical control device, which is an electrical appliance that makes a predetermined step change of the controlled quantity in the electrical output circuit when the change of the input quantity (excitation quantity) meets the specified requirements.

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 a kind of "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.

5. Leakage protector Leakage protector, referred to as leakage switch, also known as leakage circuit breaker, is mainly used to protect the equipment from electric shock when leakage fault occurs and to protect people with fatal danger, with overload and short circuit protection functions, which can be used to protect the overload and short circuit of the line or motor, and can also be used as an infrequent conversion and start of the line under normal circumstances.

The common ones are:Knife switch, fuses, low-voltage circuit breakers,Contactors, relays and master electrical appliances; The most common loads of low-voltage appliances are distribution lines, motors, and household and similar household (lighting, household appliances, etc.).

Definition of low-voltage electrical appliances.

Low-voltage electrical appliances are components or equipment that can manually or automatically turn on and off circuits according to external signals and requirements, so as to switch, control, protect, detect, transform and adjust circuits or non-electrical objects.

Classification of low-voltage appliances.

According to the mode of action, it can be divided into manual electrical appliances and automatic electrical appliances.

According to the nature and use of work, it can be divided into electrical control and protective appliances.

According to whether there are contacts or not, it can be divided into contact electrical appliances and non-contact electrical appliances, and according to the working principle, it can be divided into electromagnetic appliances and non-electric control appliances.

Low-voltage electrical appliances refer to electrical appliances that play the role of on/off, protection, control or regulation in circuits with AC voltage less than 1200V DC voltage less than 1500V. Commonly used are:

Knife switches, fuses, air switches, button contactors, thermal relays, intermediate relays, time relays, speed relays, etc.

There are many types of low-voltage electrical appliances, and there are many ways to classify them.

1. According to the mode of action, it can be divided into:

Manual electrical appliances: electrical appliances that rely on external force to directly operate for switching, such as knife switches, button switches, etc.

Automatic electrical appliances: electrical appliances that rely on instructions or changes in physical quantities to act automatically, such as contactors, relays, etc.

According to the use, it can be divided into:

Low-voltage control appliances: mainly play a controlling role in low-voltage power distribution systems and power equipment, such as knife switches, low-voltage circuit breakers, etc.

Low-voltage protective appliances: mainly play a protective role in low-voltage power distribution systems and power equipment, such as fuses, thermal relays, etc.

3. According to the type, it can be divided into: knife switch, knife transfer switch, fuse, low-voltage circuit breaker, contactor, relay, main electrical appliance and automatic switch.

1. Knife switch.

2. Automatic air circuit breaker.

3. Transfer switch.

4. Button. 5. Low-voltage circuit breaker.

6. a fuse.