Naming and classification of low-voltage electrical appliances commonly used in printing equipment

1. Classification of low-voltage electrical appliances

Low-voltage electrical appliances refer to electrical appliances that are used in circuits with AC and DC voltages of 1200V and below for on-off, protection, control or regulation. There are many varieties of low-voltage electrical appliances used in the printing industry, with a wide range of uses. Low-voltage electrical appliances can be divided into low-voltage controlled electrical appliances and low-voltage distribution circuits according to the objects it controls.

Low-voltage control appliances are mainly used in printing machinery power transmission systems. The electrical equipment of the transmission system should have the characteristics of punctual and reliable work, high operating frequency, long life, small size and easy maintenance. Such appliances include relays, contactors, travel switches, rheostats, electromagnets, etc.

Low-voltage electrical appliances can be divided into automatic switching electrical appliances and non-automatic switching electrical appliances according to their action nature.

Automatic switching of electrical appliances means that it completes the actions of turning on, breaking, starting, reversing and stopping. It is automatically performed or completed depending on the change of its own parameters or external electrical signals, rather than being directly operated by humans, such as automatic switches, Contactors, etc.

Non-automatic circuits are also called manual appliances, which are mainly switched by direct operation by hand, such as knife switches, transfer switches, and master appliances.

2. Description of the naming of low-voltage electrical appliances

The compilation of low-voltage electrical product models is applicable to the following 12 types of products: knife switches, transfer switches, fuses, automatic switches, controllers, contactors, control relays, main electrical appliances, resistors, varistor, regulators, electromagnetic iron.

The low-voltage electrical product model compilation method has the following points:

â‘ All product models are compiled with Chinese Pinyin letters and Arabic numerals;

â‘¡ Each product model refers to a type of product, but may include several derivative series of the product. The full product model is the product model, followed by its specifications (such as current, voltage or dissolved value, etc.) and other numbers or letters to determine the main specifications and derived characteristics of a product;

â‘¢ The combination of class code and design serial number indicates the product series.

Table Low-voltage electrical product model classification group table

Code Name ABCDGHJKLMPQRSTUWXYZH Knife Switch and Transfer Switch Knife Switch Enclosed Load Switch Open Load Switch Fuse Type Knife Open Knife Switch Other Combination Switch R Fuse Plug-in Busbar Spiral Enclosed Tube Type Fast Filled Tube Type Current Limit Other D Automatic switch lighting demagnetization fast universal type current limiting other device type K controller drum-shaped plane cam other C contactor high voltage AC intermediate frequency time other DC Q starter button type magnetic decompression manual oil immersion star triangle other comprehensive J control relay Current Heat Time General Temperature Other Intermediate L Master Electrical Button Master Controller Master Switch Foot Switch Knob Q Universal Transfer Switch Travel Switch Other Z Resistor Plate Element Punched Element Tubular Element Sintered Element Cast Iron Element Resistor Other B Rheostat rotary arm excitation frequency sensitive start graphite start speed regulation oil immersion start liquid start slip line type other T regulator voltage M electromagnet traction lifting brake A other protector latch lamp junction box bell

Table General Derivative Code Table

Derived letters represent meaning A, B, C, D ... Structural design is slightly improved or changed J AC, splash-proof Z DC, automatic reset, shockproof, heavy duty W without arc extinguishing device N reversible S with locking mechanism, manual Reset, waterproof, three-phase, three power supplies, dual-coil P electromagnetic reset, drip-proof, stand-alone, two power supplies, voltage K open type H protection type, with buffer device M sealed type, degaussing Q dustproof type , Handcart type L current type F high return, with shunt trip

Examples of low-voltage electrical appliance models:

(1) HD13-600 / 31. HD indicates a single-pole switch, 13 indicates a design code, and the description is a side-front operating mechanism type, 600 indicates a rated current of 600A, 31 indicates 3 poles, and 1 indicates an arc-extinguishing cover.

(2) CZ0-100 / 20. CZ means DC contactor, 0 means design code, 100 means rated current is 100A, 2 in 20 means with two normally open main contacts, 0 means no normally closed main contacts. The representative name of the full model is: 100A DC contactor with two normally open main contacts.

(3) CJB12-150. CJ represents the AC contactor, 12 represents the design code, B represents the arc extinguishing method using grid (CJ12 original arc extinguishing method uses magnetic blowing, and now the arc extinguishing method uses grid, indicating that the structural design has changed slightly, in order to have some The difference is derived code B), 150 means that the rated current is 150A, the full model representative name is: 150A AC contactor, using grid extinguishment.

(4) JZ3-44JS / 1. JZ represents the intermediate relay, 3 represents the design code, 44 represents the contact combination in the form of 4 normally open and 4 normally closed, JS is the derived code, J represents the AC coil, S represents with the holding coil, and 1 represents the installation before the open board.

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