Siemens 6ES5981-0HA21 Fan Subassembly for SIMATIC S5

Core Cooling Solution for S5 Long Racks

The Siemens 6ES5981-0HA21 is a fan subassembly for long mounting racks within the SIMATIC S5 system . This unit provides active cooling to maintain proper operating temperatures inside the rack. It operates directly from a 24V DC power supply . Consequently, it ensures stable and long-term operation of S5 controllers in demanding industrial environments.

Design, Installation, and Compatibility

This fan subassembly is designed specifically for S5 long racks, such as those used in the S5-115U and larger systems. It simplifies installation with a modular design that fits directly into the rack mounting system. The 6ES5981-0HA21 is part of a family of cooling accessories that includes variants for 115/230V AC systems . Furthermore, it complies with the RoHS directive for environmental responsibility . The following table details its key functional and physical parameters.

Application in Legacy S5 System Support

Plant engineers and maintenance personnel use this fan subassembly to maintain proper cooling in existing S5 long rack systems. It is especially valuable in environments where reliable thermal management is critical for system stability. The Siemens 6ES5981-0HA21 enables continued operation of proven legacy equipment. Therefore, sourcing tested and functional units is essential for lifecycle management of classic Siemens automation platforms.