MC is the abbreviation of Multi-Contact, and 4 is the size of the metal core diameter. Therefore, in the photovoltaic connector market, many so-called MC4s need to be re-clarified, and they may be more appropriately called "MC4-like".

      Except for some appearance differences, the core difference between MC4 and "MC4-like" lies in whether it uses MULTILAM technology. MULTILAM technology has long-term stability, which can ensure that the connector maintains a consistently low contact resistance throughout the life cycle of the photovoltaic system.

      "Class MC4", for market reasons, claims to be interoperable with MC4. Although the connection appears to be completed in appearance, invisible security risks have already occurred. Connectors of different manufacturers are not consistent in specifications, dimensions and tolerances, so they cannot be matched 100%. If you forcibly insert each other, it will cause temperature rise, contact resistance changes, and problems that the IP rating cannot be guaranteed, which will seriously affect the power generation efficiency and safety of the resistors.

      What's more serious is that if there is a problem, it is very likely to lead to legal disputes. As the relevant laws and regulations are not perfect, the responsibility for problems caused by mutual insertion is likely to be borne by the power station installer.