General
Product type	earth conductor strip
Number of connections	3
Connection type	tension spring connection
Rated cross-sectional area	2,5 mm²
Cross-sectional area	0.08 to 4 mm²
Mounting method	NS 35/7,5, NS 35/15
Colour	Green-yellow

The ST 2,5-TWIN-PE from Phoenix Contact is a protective earth conductor terminal block, specifically developed for the safe and reliable connection of protective earth conductors in industrial electrical installations. With a rated cross-sectional area of 2.5 mm² and an allowable conductor cross-section range of 0.08 mm² to 4 mm², the device is suitable for a wide range of applications in the field of electrical safety. The terminal block is coloured green-yellow, the international identification colour for protective earth conductors, enabling clear visual identification in the enclosure. Mounting is done on standard support rails according to NS 35/7.5 and NS 35/15, ensuring universal use in various enclosure constructions.

Applications
This terminal block is used in industrial electrical engineering where a secure and permanent connection of protective earth conductors is required. It is applied in enclosures, control systems, machine construction, and during the installation of electrical systems, where grounding of devices and components must comply with VDE and EN standards. The terminal block is intended for indoor use and serves to connect multiple protective earth conductors in a row, thereby increasing mounting efficiency.

Functions and Equipment in Detail
The ST 2,5-TWIN-PE features a spring clamp connection, enabling quick and tool-free installation. The spring clamp mechanism ensures a secure connection without requiring additional screwing tools, thus reducing installation time. The terminal block provides three connections, allowing up to three conductors to be connected in a row. The green-yellow colouring corresponds to the international standard for protective earth conductors and supports clear identification in the enclosure.

Technology Explained Simply
The spring clamp connection operates via an elastic spring that automatically secures the conductor when inserted into the terminal block. This mechanism ensures a stable electrical connection without the risk of loosening due to vibrations or thermal stress. The rated cross-sectional area of 2.5 mm² is sufficient for most industrial applications and complies with common standards for protective earth conductors. The allowable cross-section range of 0.08 mm² to 4 mm² allows use with various conductor diameters, making the terminal block flexible in application.

Compatibility and Accessories
The terminal block is compatible with standard support rails according to NS 35/7.5 and NS 35/15, enabling universal mounting in enclosures. As accessories, various jumper bridges are available, such as FBS 2-5 BU, FBS 3-5 BU, FBS 4-5 BU, FBS 5-5 BU, FBS 10-5, FBS 20-5, and FBSR 10-5, which allow parallel connection of multiple terminals. Additionally, insulating stop sleeves (ISH 2,5/1,0, ISH 2,5/0,2), markers (UCT-TM 5, UC-TMF 5 CUS), and end holders (E/UK 1, CLIPFIX 35-5) are available, facilitating mounting and identification. A cover segment (DS-ST 2,5) and an end cap (D-ST 2,5-TWIN) can be used for finishing the row.

Mounting and Installation
Mounting is done by simply snapping the terminal block into the support rail. The spring clamp connection allows inserting the conductor without tools. The terminal blocks can be arranged in a row, with jumper bridges enabling parallel connection of the terminals. The green-yellow colour supports clear identification and prevents incorrect connections. Mounting is quick and requires no additional tools, except when using jumper bridges or markers.

Advantages in Operation
The ST 2,5-TWIN-PE provides a reliable and safe connection for protective earth conductors, meeting the requirements of electrical safety. The tool-free installation via the spring clamp connection reduces installation time and minimizes error sources. The clear identification via the green-yellow colour supports maintenance and inspection. Compatibility with various accessories allows flexible adaptation to different requirements in enclosure construction.