Insulated Fuse Holder Acti9 STI 1P+N 500V

The Acti9 STI 1P+N insulated fuse holder from Schneider Electric is a device specifically designed to provide protection in industrial and tertiary installations that require high breaking capacity and safety. It belongs to the Acti9 range, renowned for its reliability and performance in low voltage electrical systems. This fuse holder switch model features a range of technical characteristics that make it an ideal choice for protecting electrical equipment and systems against short circuits and overloads.

This fuse holder offers comprehensive protection through gG or aM type fuses, allowing its use in different applications. The gG fuses are designed to protect against overloads and short circuits, while the aM fuses, specialised in motor protection, provide a rapid response to short circuits, protecting loads with high peak currents. The size of the fuse cartridge it accommodates is 10.3 mm x 38 mm, ensuring adequate protection capacity under various conditions of use.

One of the advantages of the Acti9 STI is its easy installation. This device is designed to be mounted on DIN rails in a modular manner, making it a flexible and adaptable solution for various configurations. Additionally, it is adjustable in clips, facilitating its integration into electrical panels. Its compact structure, with dimensions of 81 mm in height, 18 mm in width, and 75 mm in depth, makes it ideal for installations where space is limited.

The Acti9 STI fuse holder also features a safety-oriented design. The terminals have a protection rating of IP20, which increases to IP40 when installed in a modular cabinet, ensuring no accidental access to live parts. This makes it a safe option for both the installer and the end user. Additionally, it incorporates an optional neon indicator light that, when installed, lights up red if the fuse is blown, facilitating quick fault diagnosis in the system. Under normal operating conditions, the light remains off.

Another notable feature is the snap-on marker on the front face or downstream terminal, which allows easy identification of the fuse's presence, facilitating maintenance tasks. For greater convenience and efficiency, the fuse holder comes with a captive fuse and an additional cover that allows storing a spare fuse, ensuring the system can be quickly restored in the event of a failure.

This device is designed to withstand a nominal current of up to 25 A and operates with a nominal operating voltage of 500 V AC, allowing it to be used in a wide range of electrical applications. Moreover, it features a tightening torque of 2 N.m, ensuring a secure and durable connection at all times. The terminals allow the connection of one or two cables, both rigid and flexible, with a diameter between 0.75 and 10 mm², depending on the type of cable used.

Technical Data

• Nominal current: 2 A, 4 A, 6 A, 10 A, 16 A, 20 A, 25 A.
• Nominal operating voltage: 500 V AC.
• Compatible fuse curves: gG (general purpose) and aM (motor protection).
• Fuse size: 10.3 mm x 38 mm.
• Protection rating: IP20 at terminals, IP40 in modular cabinet.
• Dimensions: Height 81 mm, width 18 mm, depth 75 mm.
• Mounting: On adjustable DIN rail with 9 mm steps.
• Connections: Terminals with screw clamps for rigid or flexible cables.
• Blown fuse indicator: Optional 230V neon light.

This insulated fuse holder is an ideal solution for electrical installations that require high safety, efficiency, and ease of maintenance. With its ability to protect against overloads and short circuits, as well as its simple installation system, the Acti9 STI 1P+N is an excellent choice for a wide variety of industrial and tertiary applications.