General
Terminal type	2-wire pass-through terminal
Conductor cross section	0,5–4(6) mm²
Connection technology	Push-in CAGE CLAMP®
Colour	Blue
Rail width	35 mm
DIN rail height	15 mm
Text	laterally and centrally
Explosion safety	Ex e II, Ex i

The WAGO 2004-1204 is a 2-wire pass-through terminal block in blue finish, designed for use in industrial electrical installations. It enables secure and quick connection of two conductors with a cross-section of 0.5 to 4 mm² (optionally up to 6 mm²), using a push-in connection technology. The terminal block is designed for mounting on standard support rails with dimensions 35 x 15 mm and 35 x 7.5 mm, ensuring universal use in enclosures and distribution boxes. The blue color serves as a visual identifier and supports clarity in complex installations.

Applications

The terminal block is suitable for applications in explosion protection categories Ex e II and Ex i, qualifying it for use in environments with increased safety requirements, such as in the chemical industry or when handling flammable gases. Use in explosive atmospheres requires compliance with specific standards and regulations, which must be considered during planning and installation. The terminal block is designed for use in electrical installations with operating voltages up to 690 V, with the exact voltage limit depending on the application and circuit diagram.

Functions and Equipment in Detail

The terminal block features a push-in connection technology known as CAGE CLAMP®. This technology allows the conductor to be inserted without tools, with the conductor secured by a spring-loaded clamping mechanism. The connection is self-stripping, ensuring reliable contact even with different conductor cross-sections. The terminal block offers both side and central labeling options, facilitating identification of connections during operation. Labeling is done using integrated labels that can be directly inserted into the terminal block.

Technology Explained Simply

The push-in technology of the CAGE CLAMP® terminal block reduces installation time and minimizes error sources, as no screw connection is required. The spring force of the clamping mechanism ensures a stable electrical contact, which remains intact even under vibration or temperature fluctuations. The terminal block is designed for use in enclosures, where it is mounted on standard support rails. The blue color serves as a visual identifier and supports cable assignment according to color coding, which is particularly beneficial in complex installations.

Compatibility and Accessories

The terminal block is compatible with various labeling systems, including WMB multi-labels in different colors (e.g., green, gray) as well as mini-WSB labels in colors such as orange, red, and violet. Additionally, blank modules (e.g., 2004-549) or group label carriers (e.g., 2009-193) can be used to supplement labeling or cover empty positions. The terminal block can also be combined with comb bridges (e.g., 2004-403, 2004-405) to electrically connect multiple terminals. For mounting, various support rails (e.g., 210-112, 210-114) are available, which can be perforated or non-perforated, and galvanized or strip-galvanized, depending on requirements.

Mounting and Installation

Mounting is done by simply snapping the terminal block onto the support rail, where it is secured by an integrated latching mechanism. Conductor connection is achieved by inserting the conductor into the clamping channel, with the push-in technology ensuring tool-free operation. Labeling can be done during installation or later, with labels inserted into designated slots. The terminal block is designed for use in enclosed enclosures, where environmental conditions (temperature, humidity) must comply with relevant standards.

Advantages in Operation

The terminal block provides a fast and secure connection, reducing installation time and minimizing error susceptibility. The push-in technology enables tool-free installation, which is particularly advantageous during maintenance work. Labeling options support clarity and maintainability of the installation. Compatibility with various accessories allows flexible adaptation to different requirements. The approval for Ex e II and Ex i expands the application range in safety-critical installations.