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ST4M12B Plug-in solar connector

Reference: 22000001

The ST4M12B plug in connector is compatible with MC4. It is used to connect the different PV solar panels installed on the roof or in any other type of assembly with the different cables with a cross-section of 4 to 6 mm² that are part of the installation. It has a locking system and is easy to assemble.

Key features of the new connectors for 2024:
Integrated safety device to prevent tampering that could compromise the safety of the solar installations.

  • TÜV certification. Recognised by one of the most prestiogious institutions in the sector, ensuring quality and reliability.
  • Ensayos exhaustivos en laboratorios de SGS. Hemos sometido nuestros conectores a:
    • Ensayos de calentamiento
    • Ensayos mecánicos
    • Ensayos de resistencia
    • Ensayos de compatibilidad con Stäubli Evo*, asegurando su compatibilidad en la gran mayoría de instalaciones.

This plug-in solar connector ST4M12B  is always sold in sets of two, together with the female solar connector ST4F12B.


* It is important to note that Stäubli Evo´s compatibility is essential for many panel and inverter suppliers, who demand testing and documentation of compatibility.




Rated current

30 A

Operating temperature

-40ºC / 85ºC


IP65/IP68 (1m,1h)

Application class


Cable/wire cross

4 mm / 6 mm

Security class



UL94 V-0

Insulating material

Copper, tinned

Connectors contact resistance

≤ 0.5mΩ

Voltage test

6KV (50Hz, 1min)

Upper limiting temperature


Wire range

2,5 – 4 – 6 mm2

Closing system

Snap lock with security system

Technical details

Download the Technical Factsheet of plug-in solar connector ST4M12B