What are the classifications of low voltage electrical appliances? What are the typical low voltage

Low-voltage electrical appliances refer to electrical components that play the role of protection, control or regulation in power lines with AC and DC voltages up to 1200V. There are many types of low-voltage electrical appliances, but they can be summarized into the following two main categories in terms of their purpose or the objects they control.

1) Low-voltage distribution appliances.

Such appliances include knife switches, transfer switches, fuses, automatic switches, and protective relays. It is mainly used in low-voltage power distribution systems, and requires accurate action, reliable operation, and sufficient thermal and dynamic stability in the case of system failure.

2) Low-voltage control appliances.

Such appliances include control relays, contactors, starters, controllers, regulators, master appliances, resistors, rheostats, and electromagnets. It is mainly used in electric drive systems, which requires long life, small size, light weight and reliable operation.

Common ones include knife switches, fuses, low-voltage circuit breakers, contactors, relays and main 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.

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.

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.

1) Control electrical appliances.

2) Power distribution appliances.

3) Implement Ranling Electric.

4) It can communicate low-voltage electrical appliances.

5) Electrical appliances at the end of the final rolling bridge.