General
Nominal voltage	800 V
Nominal current	24 A
Number of connections	3
Connection type	tension spring connection
Rated cross-sectional area	2,5 mm²
Cross section	0,08 - 4 mm²
Mounting method	NS 35/7,5, NS 35/15
Colour	Grey

The Phoenix Contact ST 2,5-TWIN (manufacturer number 3031241) is a passage terminal for use in industrial electrical installations. It provides a secure and reliable connection for conductors with a rated cross-section of 2.5 mm² and allows the connection of up to three conductors at a single connection point. The terminal is designed for mounting on standard rails of type NS 35/7,5 and NS 35/15, ensuring universal use in enclosures and distributions. The terminal is grey in colour, which is typical for industrial connection technology and provides good visibility during installation.

Applications

The ST 2,5-TWIN is designed for use in electrical installations where high mechanical and electrical load capacity is required. It is particularly suitable for applications in automation technology, the machine-building industry, and building automation, where a stable and durable connection of cables and conductors is necessary. The terminal is rated for a nominal voltage of 800 V and a nominal current of 24 A, making it suitable for a wide range of industrial applications.

Functions and Equipment in Detail

The terminal features a spring clamp connection, enabling quick and secure fastening of conductors without requiring additional tools such as screwdrivers. The spring clamp connection ensures a secure contact that remains stable even under vibrations and mechanical stress. The connection cross-sections range from 0.08 mm² to 4 mm², making the terminal suitable for a wide range of conductor cross-sections. The maximum number of connections is three, enabling flexible wiring.

Technology Explained Simply

The spring clamp connection operates via a spring that is automatically compressed when the conductor is inserted and then holds it securely in place. This mechanism ensures a secure electrical connection without the risk of loosening. The terminal is rated for a nominal voltage of 800 V, making it suitable for high-voltage applications in industry. The nominal current of 24 A allows use in installations with medium to high current loads. The rating for a cross-section of 2.5 mm² ensures the terminal is suitable for most standard conductors in industrial applications.

Compatibility and Accessories

The ST 2,5-TWIN is compatible with various accessories that enhance the functionality and safety of the installation. These include reduction bridges such as RB ST 10-(2,5/4) or RB UT 6-ST(2,5/4), which enable connections between different cross-sections. Insulation sleeves in various colours (e.g. black, white, blue) as well as warning covers such as WST 2,5 can be used for marking and protecting connections. Plug bridges such as FBS 50-5 or FBS 20-5 allow parallel connection of multiple terminals. Additionally, labelling options such as ZBF 5 CUS or UCT-TMF 5 CUS are available to clearly identify the terminals.

Mounting and Installation

Mounting is carried out on standard rails NS 35/7,5 or NS 35/15, which are widely used in industrial electrical engineering. The terminal is simply clipped onto the rail and locks automatically. Connection of the conductors is achieved by inserting them into the spring clamp connection, with no additional tools required. Installation is therefore quick and simple, even in tight or hard-to-reach areas.

Advantages in Operation

The ST 2,5-TWIN offers high reliability and longevity due to its robust spring clamp connection. The terminal is designed for high mechanical load capacity and is suitable for applications involving vibrations or movements. The simple mounting and maintenance reduce installation time and minimise error sources. Compatibility with various accessories enables flexible and secure adaptation to specific requirements of individual installations.