Description
Siemens 3RU2126-4CB0 Overload Relay Overview
The Siemens 3RU2126-4CB0 is a thermal overload relay designed for dependable motor protection in HVAC, commercial, and industrial applications. Built to the S0 frame size, this relay offers a current setting range of 17–22A and features convenient screw terminal connections for straightforward installation and secure wiring.
Key Features
- Frame Size: S0 — compatible with Siemens S0-size contactors and starters
- Current Setting Range: 17–22A for precise motor overload protection
- Screw Terminal Connections: Reliable, vibration-resistant wiring interface
- Thermal overload protection guards motors against sustained overcurrent conditions
- Manual and automatic reset capability for operational flexibility
- Compact design integrates directly with matching Siemens contactors
- Trip class protection helps prevent motor burnout and extends equipment life
Application
The 3RU2126-4CB0 is well-suited for protecting three-phase motors in HVAC systems, pumps, fans, compressors, and other motor-driven equipment. Its S0 frame size allows direct mounting onto compatible Siemens contactors, reducing panel space and simplifying wiring. The screw terminal design ensures a secure connection in demanding environments.
Why Choose Siemens Overload Relays
Siemens overload relays are engineered to deliver consistent, accurate protection across a wide range of motor applications. The 3RU2 series is recognized for its robust construction, ease of installation, and compatibility within the Siemens SIRIUS control product family — making it a trusted choice for HVAC technicians and electrical contractors alike.
