General
Terminal type	3-wire pass-through terminal
Connection system	CAGE CLAMP®
Conductor cross section	0,08–2,5 mm²
Colour	Grey
Text	Centrical
Rail width	35 mm
DIN rail height	7.5 and 15 mm

The WAGO 280-681 is a 3-wire pass-through terminal block designed for use in industrial electrical installations. It enables secure and reliable connection of up to three wires within a single terminal channel, with the connection achieved via the CAGE CLAMP® principle. This connection system ensures automatic, force-locked fixation of the wire without requiring additional tools, thereby guaranteeing a stable and long-lasting connection. The terminal block is finished in grey and features central labelling, enabling clear identification of the connections. It is designed for mounting rails with dimensions 35 x 15 mm and 35 x 7.5 mm, allowing universal installation in standard control panels.

Applications
This terminal block is suitable for use in enclosures, control systems, and distribution units where secure and durable electrical connections are required. It is commonly used in industrial automation, building automation, and electrical installations. Its typical use is in control panels with rail-mounted components, as the terminal block is simply clipped onto the rail, enabling modular expansion of the system.

Functions and Features in Detail
The 3-wire pass-through terminal block 280-681 allows connection of three individual wires, with current flowing through the block. The central labelling facilitates identification of individual terminals, particularly in complex circuits. The CAGE CLAMP® system ensures a secure and durable connection, as the wire is automatically clamped by a spring-loaded mechanism. The terminal block is rated for wire cross-sections from 0.08 to 2.5 mm², covering a wide range of cable types, from fine control wires to heavier power supply cables.

Technology Explained Simply
The CAGE CLAMP® connection system operates without tools: the wire is simply inserted into the terminal block, where a spring-loaded clamp automatically secures it. This prevents the connection from loosening due to vibrations or mechanical stress. The terminal block is designed to ensure even pressure distribution on the wire, enabling optimal electrical conductivity and heat dissipation. The grey colour of the terminal block is standard and aids visual differentiation within the control panel.

Compatibility and Accessories
The terminal block is compatible with mounting rails of dimensions 35 x 15 mm and 35 x 7.5 mm, enabling installation in most industrial control panels. Various accessories are available to extend functionality, such as plug-in wire bridges (e.g. 249-125), test adapters (e.g. 280-404), or partition panels (e.g. 280-344). These components can be used depending on the application to improve circuit organisation, testing, or isolation.

Installation and Mounting
Mounting is performed by clipping the terminal block onto the mounting rail. The terminal block features a precise fit, ensuring secure attachment. Wire connections are made by inserting the cable into the terminal block, where the CAGE CLAMP® system automatically secures the wire. No special tools are required, as the terminal block is tool-free to install. The central labelling simplifies wire assignment during installation.

Operational Advantages
The terminal block offers high reliability through the CAGE CLAMP® system, which ensures a durable and secure connection. The tool-free installation reduces installation time and minimises error sources. Compatibility with various mounting rail dimensions increases flexibility in planning and executing control panels. The central labelling supports maintenance and fault diagnosis, as connections are clearly identifiable.