General
Terminal type	3-wire protective earth terminal
Conductor cross section	0,08–2,5 mm²
Colour	Green-yellow
Text	Centrical
Rail width	35 x 15 and 35 x 7.5 mm
Terminal technology	CAGE CLAMP®

The WAGO 280-637 is a 3-conductor protective earth terminal block, specifically designed for use in industrial electrical installations. It enables the safe and reliable connection of protective earth conductors with a cross-section of 0.08 to 2.5 mm². The terminal block is finished in green-yellow, which corresponds to the international marking for protective earth conductors, and features a central labeling that ensures clear identification of connection points. The terminal block is designed for mounting on standard support rails in formats 35 x 15 mm and 35 x 7.5 mm, enabling universal use in various enclosures and distributors.

Applications

The terminal block is suitable for use in electrical installations, particularly in industrial automation, during the installation of enclosures and distributors. It is commonly used in systems where secure earthing and equipotential bonding are required, such as in machine building, manufacturing plants, or building automation technology. The use of protective earth conductors is legally required to protect people from electrical hazards, and the WAGO 280-637 meets the necessary technical requirements.

Functions and Equipment in Detail

The terminal block operates on the CAGE CLAMP® principle, where the conductor is securely held by a spring-loaded clamp. This method ensures a stable and durable connection without requiring additional screwing or soldering. The terminal block is designed for three conductors, allowing multiple protective earth conductors to be connected at one point. The central labeling facilitates documentation and maintenance, as connections are clearly identifiable. The green-yellow color coding complies with DIN VDE 0100-510 and is internationally recognized as the marking for protective earth conductors.

Technology Explained Simply

The CAGE CLAMP® system ensures that the conductor is securely clamped by a spring-loaded clamp as soon as it is inserted into the terminal block. The spring force provides a secure contact that remains stable even under vibrations or temperature fluctuations. The terminal block is designed for a maximum conductor cross-section of 2.5 mm², which is sufficient for most industrial applications. The use of protective earth conductors is an essential part of electrical safety, as they provide a safe path for fault currents in the event of a fault.

Compatibility and Accessories

The terminal block is suitable for support rails in formats 35 x 15 mm and 35 x 7.5 mm, enabling installation in standard enclosures. Compatible accessories include operating tools such as the 210-720, labeling systems such as the 793-501/000-002 or 793-501/000-012, and bridge elements such as the 709-111 or 709-112. Additionally, wire end ferrules such as the 216-201, support rails such as the 210-504 or 210-118, and test plug modules such as the 280-418 or B-test adapter modules such as the 249-147 are available. These components enable flexible and application-specific configuration of enclosure installations.

Installation and Mounting

Mounting is done by simply snapping the terminal block into the support rail. The terminal block features an integrated guide that ensures secure and quick fastening. The conductor connection is made by inserting the conductor into the clamp opening, where the spring force automatically secures the contact. No additional fastening or tool application is required. The terminal block can be arranged in series, enabling continuous connection of multiple protective earth conductors.

Operational Advantages

The WAGO 280-637 provides a reliable and maintenance-friendly solution for earthing in electrical installations. The CAGE CLAMP® technology ensures a stable connection that holds even under demanding operating conditions. The central labeling and green-yellow marking facilitate identification and documentation. Compatibility with standard support rails enables flexible integration into existing systems. The terminal block is designed for industrial environments and meets requirements for safety and reliability.