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MC4 connectors are successors of the MC3 Connectors, which were developed by Multi-Contact in 1996. MC3 is the abbreviation of Multi-Contact and its size 3mm PV connector with 3 mm contact pin. MC3 had certification ratings of (1000VIEC/600V UL) and 30A (10AWG PV Cable). The MC3 connectors were discontinued in 2016.
The blue ring on the female connector indicates that it is keyed for negative polarity. The keys are the plastic ridges running along the probe on the right connector. The right connector is the female electrically, although it appears male mechanically. Solarlok is a largely obsolete electrical connector used to connect solar panels together.
MC3 connectors are a fully discontinued type of single-contact connector commonly used for connecting solar panels. MC3 are named for the original manufacturer Multi-Contact (now part of Stäubli Electrical Connectors ) with a 3 mm contact assembly pin. [ 1 ]
Flat 5-pin connector (Towing vehicle side) This contact is not as common, but is compatible with the 4-pin connector in the way that a towing vehicle with this connector can be connected to a trailer with the 4-pin flat plug. The extra connection is often used to block the surge brakes when reversing with the trailer. #
Media in category "Solar panel connectors" This category contains only the following file. MC3 connector.png 1,675 × 929; 476 KB
7-pin ISO 1724 trailer connector type 12N (Towing vehicle side). This connector uses a mix of pin and socket terminals. Physical design according to standard ISO 1724. [4] [8] The 7-pin connector uses all 7 pins on newer trailers according to the ISO standard. [9] [10] On older trailers there's sometimes a 5-wire setup using a 7-pin connector.