These are MC4 type connectors used to connect multiple solar panels or groups of solar panels in a solar field, and generally used in parallel applications. Features : With excellent aging resistance and UV resistance, it can be used in harsh environments. The O-ring on the connector is ideal for sealing out water and dust to avoid corrosion. The cable connection adopts rivet and padlock method, quick and simple to assemble. Excellent solution for parallel connection of multiple panels in one solar field. Features: Types: 10 pairs / 20 pairs / 10 pairs keyless / 20 pairs keyless / 5 pairs keyless (optional)< /p> Rated current: 16A (2.5, AWG14), 30A (4, AWG12), 52A (6, AWG10) Holding voltage: 1000V DC < p>Typical contact resistance: 2m Suitable cable size: 2.5m / 4m / 6m Protection class: Class Degree protection: IP67 Insulation material: PPO Contact material: Copper, tinned Flame class: UL94-V0 < p>Ambient temperature: -40C ~ +105C Insertion force: less than 50N Removal force: more than 50N Note: If you ordered the type which includes Key, the key color will be sent randomly (blue or orange), please take it. Package List: 10 * pairs of MC4 connectors