Acti9 STI Fuse Switch 3P+N 500V

The isolable fuse holder Acti9 STI 3P+N from Schneider Electric, reference A9N15658, is a fuse disconnection solution for industrial and tertiary applications that require high breaking capacity, ensuring protection in low voltage environments. This device is designed to provide maximum safety and performance in electrical installations, allowing effective protection against overloads and short circuits.

This fuse holder supports a rated current of up to 25A and an operating voltage of 500V AC, making it an essential component in applications that require robust and reliable protection. It is compatible with gG and aM type fuses, with the former indicated for general protection against overloads and short circuits, while the latter is aimed at motor applications, providing specific protection for short circuits in equipment that handles high peak currents.

The Acti9 STI 3P+N features a modular design that facilitates installation on DIN rail, making it a versatile and easy-to-mount option for different electrical environments. Its compact size of 81 mm height, 54 mm width, and 75 mm depth allows for easy integration into electrical panels, occupying minimal space. Additionally, the adjustable clip fastening system ensures a quick and reliable installation.

Among its most notable features is its protection rating of IP20 at the terminals, which becomes IP40 when installed in a modular cabinet, ensuring additional protection against accidental contact and dust. To enhance safety and functionality, this fuse holder includes an optional neon indicator light of 230V, which lights up red when the fuse has blown, facilitating immediate fault detection.

Furthermore, the Acti9 STI incorporates an additional cover to house a spare fuse, ensuring greater efficiency and speed in maintenance interventions. The operating lever can also be locked, increasing the safety of the equipment during service or repair tasks.

Technical specifications:

• Range: Acti9
• Model: STI 3P+N
• Number of poles: 3P+N
• Rated current [In]: 2A, 4A, 6A, 10A, 16A, 20A, 25A
• Rated operating voltage [Ue]: 500V AC
• Rated insulation voltage [Ui]: 500V AC at 50/60 Hz
• Fuse curve: gG (general purpose) or aM (motor protection)
• Fuse size: 10.3 mm x 38 mm
• Protection: IP20 at terminals, IP40 in cabinet

Connections and mounting:

• Mounting type: On DIN rail, with adjustable fastening via clip
• Terminal connections:
  • 1 rigid cable (0.75-10 mm²), 1 flexible cable (0.5-6 mm²)
  • 2 rigid cables (0.75-4 mm²), 2 flexible cables (0.5-6 mm²)
• Stripped cable length: 12 mm
• Tightening torque: 2 N.m

Additional benefits:

• Advanced protection: Provides effective protection against overloads and short circuits thanks to compatibility with gG and aM fuses.
• Optional indicator light: Facilitates locating blown fuses without the need to disconnect the system, increasing maintenance efficiency.
• Enhanced safety: Thanks to its IP40 protection rating in a modular cabinet and the ability to lock the lever, it ensures safe use in demanding environments.

This fuse holder from the Acti9 range is an excellent choice for those seeking a reliable, safe, and easy-to-install electrical protection solution for tertiary and industrial applications.