The poor quality of M12 panel plug socket and converter is an important cause of electrical fire. The quality problems of small plugs, sockets and converters will pose serious harm to the personal and property safety of consumers. Therefore, consumers should pay attention to the safety of products when purchasing plugs, sockets, converters and switches, and the following performance indicators mainly affect their safety:
Signs are an important basis for instructing people to install, use and maintain correctly, and are extremely important safety standards to ensure personal and property safety. Plug and socket products shall be marked with rated current, rated voltage, power supply properties, etc. in obvious positions. In addition, converter (converter refers to mobile electrical accessories with only one plug part and one or more socket parts combined together) products should be marked with “MAX (or)” symbol to guide users to avoid overload use. Signs or symbols shall be durable and legible. Screen printing and paper stickers that can be easily erased should not be used.
Rating is the basic electrical exchange and coordination parameter to ensure the normal, safe and coordinated use of panel plug and socket, converter and connected electrical appliances. For example, the rated current of the converter shall not be greater than the rated value of the plug part. Otherwise, it may cause danger when the user selects electrical appliances according to the rated current of the socket, and the plug is heated by over current; The rating of converter with fuse and overload protector shall be equal to the rating marked on fuse and overload protector. Otherwise, product damage may occur.
Size is an important technical requirement related to whether the plug, socket and converter can be used safely and meet the general interchangeability requirements to avoid wrong insertion. Unqualified dimensions will affect users’ use or cause hidden dangers such as poor contact and wrong insertion, which may cause damage to equipment or fire and electric shock accidents.
Protection against electric shock
Anti-electric shock protection is a key safety index to ensure that plugs, sockets and converters will not cause electric shock accidents to users and others under normal use or even some unexpected circumstances. When the plug and socket are fully or partially inserted, the live parts of the plug should not be touched; Any pin of the plug should not be inserted into the live socket when the other pins are accessible. Plug, socket and converter with protective door shall be able to prevent unipolar or probe insertion.
The sleeve assembly of the socket should be elastic enough to ensure sufficient contact pressure on the plug pin. The socket should be corrosion-resistant and wear-resistant to ensure good contact between the plug and socket; The pin of the plug should be locked and can not rotate, otherwise it will affect the insertion performance and produce unsafe factors; The converter has a cord fixing device to ensure that the cord is fixed and can withstand normal tension and torsion; When the plug and socket are plugged in, the plugging surfaces should be basically tight to prevent electric shock accidents.
Panel plugs and sockets shall have sufficient mechanical strength to withstand various mechanical stresses caused by falling, impact and extrusion during installation and use; Sockets with protective doors should be able to prevent unipolar insertion.
Heat and flame resistance
High temperature has a great influence on various properties of insulating materials. Under the condition of high temperature, the structure and characteristics of insulating materials will undergo essential changes, which determines the reliability of materials. Some materials will gradually soften at high temperature, and the mechanical strength will decrease, which will affect the quality of plugs and sockets and the safety in use. In addition, the insulation materials of plugs and sockets should have certain flame retardant properties.
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