Description
Siemens 3RU2126-4DB0 Overload Relay Overview
The Siemens 3RU2126-4DB0 is a thermal overload relay engineered to provide dependable overcurrent protection for three-phase motors and other inductive loads in commercial and industrial HVAC applications. With an adjustable current setting range of 20–25A, this relay integrates seamlessly into Siemens SIRIUS modular control assemblies and can be mounted directly onto compatible contactors for a compact, panel-ready solution.
Key Features
- Adjustable trip current range: 20–25A
- Designed for direct mounting onto Siemens SIRIUS S0-frame contactors
- Provides reliable overload and phase-failure protection for three-phase motors
- Manual and automatic reset modes for flexible system operation
- Integrated test and reset button for easy commissioning and maintenance
- Compact, modular design for space-efficient panel installation
- Auxiliary contacts included for remote signaling and control circuit integration
Applications
- Motor protection in commercial HVAC systems
- Compressor and fan motor control panels
- Pump motor starters in hydronic and chilled water systems
- Industrial motor control centers (MCCs)
- General-purpose three-phase motor protection
Why Choose the Siemens 3RU2126-4DB0
Siemens SIRIUS overload relays are a trusted standard in motor protection, combining precision thermal tripping with rugged construction suited for demanding HVAC and industrial environments. The 3RU2126-4DB0’s direct-mount compatibility with Siemens contactors eliminates the need for additional wiring between the contactor and overload, reducing installation time and panel footprint. The adjustable 20–25A range gives technicians the flexibility to fine-tune protection to match the exact full-load amperage of the connected motor.
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