General
Product type	3-wire pass-through terminal
Colour	Blue
Conductor cross section	0,08–2,5 mm²
Degree of protection	Ex i

The WAGO 280-651 is a 3-wire passage terminal in blue finish, specifically designed for use in applications with the protection rating Ex i. This terminal enables safe and reliable connection of up to three conductors in electrical installations, particularly in environments where increased explosion or fire hazard exists. The terminal allows for continuous current flow across multiple connection points, with the connection achieved via screw or clamp technology. The blue color serves as a visual identifier and supports identification in plant construction.

Applications

The terminal is intended for use in industrial installations, particularly in areas where Ex i certification is required. This includes, for example, installations in the chemical industry, food processing, or other environments where explosive atmospheres may occur. The terminal is suitable for use in switchgear and distributors where a secure and durable connection of cables is necessary. Use in explosive areas requires careful compliance with the relevant standards and regulations.

Functions and Equipment in Detail

The 280-651 enables the connection of three conductors in a single terminal, with the connection achieved via mechanical clamp technology. The terminal is designed for a conductor cross-section of 0.08 to 2.5 mm², covering a wide range of cable types, from fine signal lines to heavier power lines. The passage function allows current flow to be continuously transmitted across multiple connection points without requiring additional connections. The terminal is manufactured in a blue plastic housing providing good insulation and mechanical stability.

Technology Explained Simply

The terminal operates on the principle of a screw terminal, where conductors are secured by a screw or clamp lever. The connection is made via a metallic contact ensuring a secure electrical connection. The Ex i certification means the terminal is suitable for use in explosive environments, minimizing the risk of ignition from electrical sparks or overheating. The terminal is designed to avoid spark generation and to keep heat development below a critical threshold. The blue color serves as a visual identifier and supports identification in plant construction.

Compatibility and Accessories

The terminal is compatible with various accessories available in the range. These include, for example, bridging combs such as 280-484 or 280-490, which enable parallel connection of multiple terminals. Also, wire chain bridges such as 709-111 or pluggable conductor bridges such as 249-127 can be used to simplify connections between multiple terminals. For mounting on support rails, steel support rails such as 210-118 or 210-504 are suitable. Additionally, wire end ferrules such as 216-101 or 216-201 can be used to prepare cable ends. Insulation plugs such as 280-470 or 280-471 are used to secure exposed contacts.

Mounting and Installation

Mounting of the terminal is done on a standard support rail (TS 35), with the terminal secured using an integrated clip or screw. Conductors are inserted into the terminal and tightened using a screw or clamp lever. The connection is visually inspectable after installation, with the blue color identifying the terminal as part of a specific circuit or function. Installation takes place in a closed switch cabinet or distributor, with compliance required with regulations for use in explosive areas.

Advantages in Operation

The terminal provides a reliable and secure connection that remains stable even under difficult environmental conditions. The Ex i certification enables use in hazardous areas, increasing overall system safety. The passage function reduces the number of required connections and lowers the risk of errors. The clear color coding simplifies identification and maintenance of the installation. The terminal is suitable for a wide range of conductor cross-sections, increasing flexibility in use. The use of accessories such as bridging combs or insulation plugs allows individual adaptation to specific requirements.