The capacitor shell or outer sealing material is marked with a string or graphic symbol related to the capacitor. The correct identification of these contents is helpful for us to correctly choose and use the capacitor. This paper introduces the contents marked on the capacitor and the meaning of the representative.
Capacitor model, usually by capital English letters and numbers composed of four parts. The first part uses the letter C to represent capacitors; The second part uses letters to represent the dielectric materials selected by the capacitor; The third part is represented by numbers or letters, representing classification; The fourth part uses numbers to represent serial numbers.
The medium materials represented by the letters in the second part usually use these letters to correspond to different materials. A tantalum electrolysis; B polystyrene and other non-polar film, BB represents polypropylene film; C high frequency ceramics; D aluminum electrolysis; E electrolysis of other materials; G alloy electrolysis; H paper film composite; I glass glaze; J Metallized paper; L Polyester polar organic film; N Niobium electrolysis; O glass film; Q Paint film; T low frequency ceramics; V mica paper; Y mica; Z paper.
Part III or Part IV is usually specified in the corresponding national industry standard.
Generally speaking, the last number is 0, and most of them are capacitors with axial leads from both ends. The last number is 1, which is mostly a radial capacitor with two leading ends at one end.
For example, CJ10 stands for metallized paper axial capacitor and CJ11 stands for metallized paper radial capacitor
CBB20 stands for metallized polypropylene film axial capacitor, and CBB21 stands for metallized polypropylene film radial capacitor
Second, if there is SH behind the model, it represents a self-healing capacitor.
Third, capacitor rated capacity and allowable deviation, capacitor capacity useful number plus unit symbol uF (micromethod) or simple digital expression. The capacity deviation is indicated by ±*% or J K M, J stands for ±5%; K stands for ±10%; M stands for ±20%.
Fourth. The rated working voltage of the capacitor is indicated by digital plus VDC or VAC.
Five, the capacitor working climate category, the use of three groups of numbers, ** / ** / **, the first group of numbers represents the lowest working temperature, the second group of numbers represents the highest working temperature, the third group of numbers represents the number of days of humidity and heat resistance.
For example, 40/85/21 indicates that the minimum working temperature is -40 ° C, the maximum working temperature is 85 ° C, and the maximum humid hot weather days is 21 days. This set of data with P0, P1 and P2 indicates the safety protection level of AC capacitors, P0 means there is no special safety protection design, P1 and P2 mean there is a corresponding safety protection structure design.
Safety certification mark, safety quality certification is generally divided into two categories, one is simple safety protection structure certification (flame retardant design, explosion-proof structure design), such as the United States UL; The other is in the safety protection structure and capacitor operating reliability (failure rate) has passed the certification assessment. For example: VDE in Germany.
The capacitor climate category and safety certification mark are generally marked on AC capacitors, and DC containers are not marked.
Power compensation capacitor models are not named according to the above rules, there are other model naming rules. Safety X2 capacitor models are usually marked the same as similar capacitors abroad, MKT stands for metallized polyester film safety capacitor, MKP stands for metallized polypropylene film safety capacitor.