MC3 connector
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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] They have a certification rating of 1KV (IEC) / 600V (UL) and 30A (10AWG PV Cable).
MC3 Connectors were launched by Multi-Contact Company (Now Staubli Electrical Connectors) in 1996. MC3 refers to Multi-Contact with its 3mm PV connector.