Siemens 6ES5188-3UA52 Central Rack | 21-Slot S5-135U/155U

Technical Overview

The Siemens 6ES5188-3UA52 is a central rack (CR) for the SIMATIC S5 programmable controller series, specifically supporting the S5-135U and S5-155U systems . This passive backplane provides the structural foundation for constructing a complete control unit, integrating power supply, CPU, and various I/O modules. It features 21 module slots, offering extensive expansion capacity for large-scale automation applications .

The central rack ensures stable communication and power distribution across all connected components . It includes an integrated power supply that accepts a 24 V DC input and provides 5 V DC at 40 A, meeting the demands of high-current configurations . The unit’s robust sheet steel construction offers excellent mechanical stability and shielding against electromagnetic interference (EMI), crucial for reliable operation in harsh industrial environments . The mounting rack is compatible with SIMATIC S5-135U and S5-155U central controllers .

Technical Specifications

Parameter	Specification
Manufacturer	Siemens
Model Number	6ES5188-3UA52
Product Type	Central Rack (ZG135U/155U)
System Compatibility	SIMATIC S5-135U, S5-155U
Number of Slots	21
Power Supply Type	Integrated
Input Voltage	24 V DC
Output Voltage	5 V DC
Output Current	40 A
Dimensions (H x W x D)	57.5 x 42.5 x 53.5 cm
Weight	Approx. 19.36 kg
Product Phase	Obsolete
Country of Origin	Germany

Key Features

21-Slot High-Density Architecture – The Siemens 6ES5188-3UA52 provides a generous 21 module slots, accommodating CPUs, power supplies, communication processors, and extensive I/O modules in a single chassis.

Integrated High-Current Power Supply – The built-in power supply unit accepts 24 V DC input and delivers 5 V DC at 40 A, ensuring stable power delivery for demanding system configurations .

Robust Industrial-Grade Construction – The sheet steel construction provides excellent mechanical stability and EMI shielding, ensuring reliable operation in harsh industrial environments .

Passive Backplane Design – The rack provides all necessary data, address, and control lines, ensuring clean signal transmission and stable power delivery between modules .

Flexible System Expansion – This rack works with interface modules to connect expansion units, enabling large-scale distributed automation architectures .

Applications

The Siemens 6ES5188-3UA52 suits large-scale manufacturing automation, process control, and distributed control systems. It is ideal for building complex SIMATIC S5-based control stations in industries such as power generation, chemical processing, steel production, and automotive manufacturing.