Description
The Siemens 3RU2116-1HB0 is a thermal overload relay designed to provide dependable motor protection across a wide range of HVAC and industrial applications. With a current setting range of 5.5 to 8 amps, this relay guards motors against overload conditions, phase failure, and excessive heat buildup — helping to extend equipment life and reduce costly downtime.
Engineered as part of Siemens’ proven 3RU21 series, the 3RU2116-1HB0 is built for direct mounting onto compatible 3RT2 contactors or panel installation via adapter, making it a versatile solution for motor starter assemblies in commercial HVAC systems, air handlers, pumps, fans, and more.
Key Features
- Current setting range: 5.5–8A for precise motor protection
- Thermal overload protection against sustained overcurrent conditions
- Phase-failure sensitivity to detect single-phasing conditions
- Manual and automatic reset modes for flexible operation
- Direct mounting onto Siemens 3RT2 contactors for compact starter assemblies
- Trip class 10A for standard motor protection requirements
- Integrated test and reset button for easy commissioning and maintenance
- Auxiliary contacts included for control circuit integration
Typical Applications
- HVAC blower and fan motor protection
- Hydronic circulator and pump motor starters
- Commercial refrigeration compressor protection
- Industrial motor control centers (MCCs)
- Air handling unit motor protection panels
Why Choose Siemens 3RU21 Series
The 3RU21 series overload relays are renowned for their reliability, compact footprint, and seamless integration with Siemens contactors. Their robust thermal bimetal design ensures accurate, repeatable tripping performance even in demanding environments — making them a trusted choice for HVAC professionals and electrical contractors alike.
