General
Terminal type	Double-stack terminal
Connection type	Through/through terminal L/L
Mounting method	DIN rail 35 x 15 mm and 35 x 7.5 mm
Terminal technology	CAGE CLAMP®
Conductor cross section	0,08–2,5 mm²
Maximum conductor cross-section	4 mm²
Colour	Grey

The WAGO double-tier terminal block type 870-501 is a through/through terminal block in L/L format, specifically designed for mounting on standard support rails with dimensions 35 x 15 mm and 35 x 7.5 mm. It is used for secure and reliable connection of cables in industrial electrical engineering and is commonly employed in enclosures, control systems, and distributions. The terminal block enables the connection of two cables in one tier, with the connection achieved via the CAGE CLAMP® principle, ensuring quick and secure fastening without additional tools.

Applications
This terminal block is suitable for use in industrial plants, machine building, automation technology, and electrical installations. It is particularly used where a compact yet robust cable connection is required, for example in control enclosures, distribution boxes, or during the installation of fuses and switches. Its compatibility with support rails of the specified dimensions makes it universally applicable in electrical and automation technology.

Functions and Equipment in Detail
The terminal block features a double-tier design, enabling parallel connection of two cables in one tier. Fastening is achieved via the CAGE CLAMP® system, where the cable is inserted into a terminal channel and automatically clamped by a pressure lever or spring force. This ensures a secure and durable connection without the risk of loosening. The terminal block is designed for cross-sections from 0.08 to 2.5 mm², with a maximum cross-section of 4 mm² possible under certain conditions. The terminal block is grey in colour, providing good visibility during installation.

Technology Explained Simply
The CAGE CLAMP® principle is based on a mechanical clamping mechanism that pulls the cable through a terminal channel and automatically creates a firm connection. This system requires no additional tools such as screwdrivers or pliers, speeding up installation and reducing error potential. The terminal block is designed for use in electrical installations requiring secure and durable connections. The connection is made via a metallic contact, ensuring low contact resistance and high electrical conductivity.

Compatibility and Accessories
The terminal block is compatible with support rails of dimensions 35 x 15 mm and 35 x 7.5 mm, which are standard in industrial electrical engineering. Suitable accessories include, for example, the comb bridge 870-408, which enables parallel connection of multiple terminals, as well as labelling systems such as the Mini-WSB quick labelling system in various colours (e.g. orange, purple, red) or the WMB multi-labelling system, which allows clear identification of cables. Additionally, end plates such as 870-519 or mounting brackets such as 209-106 can be used for mounting and finishing the rails.

Mounting and Installation
Installation is performed by simply snapping the terminal block onto the support rail. The terminal block is securely held on the rail by a spring-loaded holder and cannot accidentally slip off. Cable connection is achieved by inserting the cable into the terminal channel and then pressing the lever mechanism, which automatically clamps the cable. Installation requires no special tools and can also be carried out in confined spaces.

Operational Advantages
The terminal block offers fast and secure installation, reducing installation time. The CAGE CLAMP® system ensures a durable connection that remains stable even under vibrations and temperature fluctuations. Compatibility with standard support rails and a wide range of accessories enables flexible and adaptable installation. The terminal block is designed for industrial environments and meets requirements for reliability and safety.