The Acti 9 range from Schneider Electric includes various types of circuit protection devices, including fuse disconnectors like the STI series. These devices are typically used in electrical distribution systems to provide protection by disconnecting the circuit when a fault is detected. The fuse-disconnector STI is designed to combine the functions of a fuse and a disconnector in one unit, ensuring both protection and safe isolation.

Here are some key features and benefits of the Acti 9 fuse-disconnector STI:

1. Protection: It provides reliable protection against overloads and short circuits.
2. Safety: The disconnector function ensures safe isolation of the circuit during maintenance or in case of faults.
3. Compliance: Conforms to international standards for electrical safety and performance.
4. Ease of Use: Typically features easy-to-use mechanisms for both installation and operation.
5. Flexibility: Can be used in various applications including industrial, commercial, and residential electrical systems.

If you need more specific details about the Acti 9 fuse-disconnector STI, such as technical specifications, installation instructions, or application guidelines, please let me know!