General
Product type	2-wire pass-through terminal
Degree of protection	Ex i
Colour	Blue
Cross-sectional area	0,2 - 6 mm²
Number of conductors	2
Connection type	Through-wiring clamp

The WAGO 282-904 is a 2-wire pass-through terminal block designed specifically for use in explosion-protected installations according to the protection type Ex i. This terminal block enables the safe connection of two conductors in a pass-through configuration, with the electrical connection made via a central marking. The terminal block is finished in blue and is suitable for cross-sections from 0.2 to 6 mm². It is designed for use in industrial installations where high safety standards for power distribution and connection are required.

Applications
This terminal block is suitable for applications in explosion protection technology, particularly in environments where a source of ignition from electrical energy must be avoided. The Ex i protection type (Intrinsic Safety) ensures that the terminal block does not release any ignition energy under normal operating conditions, making it suitable for use in explosive atmospheres such as gas or dust environments. It is commonly used in process automation, the chemical industry, or in power supply systems, where safe and reliable connection of cables is required.

Functions and Equipment in Detail
The 2-wire pass-through terminal block enables the connection of two conductors within a single terminal block body, with current flow passing through the block. The central marking serves as a visual reference, simplifying installation and maintenance. The terminal block is designed for cross-sections from 0.2 to 6 mm², covering a wide range of cable sizes from fine signal lines to heavier power lines. The blue color serves as optical identification and facilitates recognition within the enclosure.

Technology Explained Simply
The terminal block operates on the principle of a pass-through terminal, where current flows through the block without requiring an additional connection terminal. The connection is made via a screw or clamp connection, securely holding the conductor. The Ex i protection type means the terminal block is designed so that it does not release any ignition energy under normal operating conditions, making it suitable for use in explosive environments. The terminal block is designed for use in enclosures and distribution systems where safe and reliable connections are required.

Compatibility and Accessories
The terminal block is compatible with various accessories that simplify installation and labeling. These include multi-labeling systems such as the WMB system in various colors (e.g., white, light green, blue, yellow) and sizes (5–17.5 mm), which can be used to label the terminals. Additionally, cross-connectors such as the 282-402 (gray, 6 mm²) or the 282-422 (yellow-green, insulated, rated current 41 A) are available to connect multiple terminals together. End plates such as the 282-325 (gray) are used for visual finishing of the enclosure front. Support rails such as the 210-112 (steel, 35x7.5 mm, galvanized, perforated) or the 210-196 (aluminum, metallic plain) allow mounting of the terminal block in standard enclosures. Warning covers such as the 282-415 (yellow, with black lightning bolt symbol for 5 terminals) serve as visual indicators for hazardous areas.

Installation and Mounting
The terminal block is mounted on standard support rails (e.g., 35x7.5 mm), commonly used in enclosures. Installation is done by simply clipping the terminal block onto the support rail, where it is secured by an integrated holder. The conductor connection is made by inserting the wire into the terminal and then tightening the screw or clamp mechanism. The central marking aids orientation during installation. The terminal block is designed for use in enclosures and distribution systems where safe and reliable connections are required.

Operational Advantages
The terminal block provides a safe and reliable connection of conductors, especially in explosive environments. The Ex i protection type ensures no ignition energy is released, increasing operational safety. The pass-through function enables efficient wiring, as no additional terminals are required. The central marking simplifies installation and maintenance, while the blue color supports optical identification. Compatibility with various accessories such as labeling systems, cross-connectors, and support rails allows flexible and individual adaptation to specific requirements.