Description
The Siemens 3RU2126-1JB0 is a thermal overload relay designed for dependable motor protection in commercial and industrial HVAC and building automation applications. Part of the 3RU2 series, this relay features a Size S0 frame and a screw-terminal connection system for secure, straightforward wiring in control panels and motor starter assemblies.
Product Overview
The 3RU2126-1JB0 provides precise, adjustable overload protection across a 7–10A current setting range, making it well suited for protecting motors, compressors, fans, and pumps commonly found in HVAC systems. Its compact S0 footprint allows direct mounting onto Siemens 3RT2 contactors of the same frame size, simplifying panel layout and reducing wiring complexity.
Key Features
- Current setting range: 7–10A
- Frame size: S0 — compatible with Siemens 3RT2 S0-frame contactors
- Screw terminal connection for reliable, vibration-resistant wiring
- Integrated manual RESET and TEST function
- Trip-class protection for motor overload and phase-failure sensitivity
- Auxiliary contacts for remote signaling and control circuit integration
- Compact design for space-efficient panel installation
- Part of the Siemens SIRIUS modular control system
Applications
- HVAC motor starters and control panels
- Compressor and pump motor protection
- Fan and blower motor circuits
- Commercial building automation and mechanical room panels
- Industrial motor control centers (MCCs)
Why Choose the Siemens 3RU2126-1JB0
As part of the SIRIUS product family, the 3RU2126-1JB0 integrates seamlessly with Siemens contactors and soft starters, enabling a coordinated, type-tested motor starter combination. The screw-terminal design ensures a robust connection that withstands the vibration and thermal cycling typical in HVAC environments, while the built-in phase-failure sensitivity helps prevent motor damage from unbalanced supply conditions.
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