General
Number of channels	4 -
Output signal	4 ? 20 mA -
Terminal cross-section	0,08 ? 2,5 mm²
Colour	Light grey -

The article WAGO 750-555 is a 4-channel analog output used in automation technology for transmitting analog signals in the range of 4 to 20 mA. The device serves as an output terminal in industrial control systems and enables the control of measuring and control devices, such as positioning motors, valves, or sensors, which are operated via analog current signals. The terminal is designed for use in modular systems, particularly in combination with other WAGO modules in the 750 system, and is typically mounted on a steel support rail.

Applications
The 750-555 is used in industrial plants where continuous process variables such as pressure, temperature, flow rate, or level are transmitted via analog current signals. It is suitable for applications in manufacturing automation, building automation, energy supply, and process industry. The output terminal enables the parallel control of four independent loads, with each channel providing a signal in the range of 4 to 20 mA. This range is widely used as a standard for analog signals in industry, as it allows for secure signal transmission even over long distances.

Functions and Equipment in Detail
The terminal features four independent output channels, each delivering an analog current signal in the range of 4 to 20 mA. The signals are connected via terminals designed for cross-sections from 0.08 to 2.5 mm². The terminal is light gray in color, enabling visual differentiation from other modules in the system. It is designed as a single module to be mounted in a system enclosure or on a support rail for integration into a modular control system.

Technology Explained Simply
The 4-channel analog output operates with a current signal of 4 to 20 mA, where 4 mA represents the zero point and 20 mA represents the maximum value of the measured variable. This type of signal transmission is robust against interference and allows precise transmission over long cable runs. The terminal generates the signal electronically and delivers it via the terminals to the connected loads.

Compatibility and Accessories
The 750-555 is part of the WAGO 750 system and can be combined with various system enclosures, including I/O polyester system enclosures in different sizes (e.g., 164 mm, 244 mm, 324 mm) and I/O aluminum system enclosures (e.g., 160 mm, 240 mm). Suitable enclosures include models 850-834, 850-835, 850-836, 850-825, and 850-826. For mounting on steel support rails, various rail variants are available, such as 210-197 (35x15 mm, 1.5 mm thick, 2 m long, yellow zinc-coated) or 210-113 (35x7.5 mm, 1 mm thick, 2 m long, unperforated, zinc-coated). Additionally, shielded terminal clamps (e.g., 790-220, 790-216, 790-116, 790-108) can be used for secure connection of shielded cables. Label carriers such as 750-103 or quick labeling systems like Mini-WSB (e.g., 248-501/000-017, 248-501/000-023, 2009-145/000-023, 2009-145/000-002) enable clear identification of the modules.

Mounting and Installation
Mounting is done on a steel support rail installed in a system enclosure or control cabinet. The terminal is simply clipped onto the rail and can then be connected to the appropriate cables. The terminals are designed for cross-sections from 0.08 to 2.5 mm², with connections made via screw terminals.

Advantages in Operation
The 750-555 provides reliable and precise signal transmission over four independent channels. The use of the 4-20-mA standard ensures high immunity to interference and easy integration into existing systems. The modular design allows for flexible system expansion, and the terminal can be easily integrated into existing installations. The light gray color supports visual differentiation in the control cabinet, and the use of standard support rails and system enclosures ensures high compatibility with other WAGO modules.