Title: Siemens 3UN2100-0CN7 Thermal Overload Relay, 0.55-0.8A, Class 10, S00 for Motor Protection

Product Overview:
The Siemens 3UN2100-0CN7 is a high-performance, bimetallic thermal overload relay designed for reliable and precise protection of three-phase AC motors against excessive temperature rises caused by overload or phase failure. As a crucial component within the Siemens SIRIUS industrial control system, this Class 10 overload relay offers exceptional safeguarding for your valuable machinery, ensuring operational continuity and preventing costly downtime. Its compact S00 size and direct mounting capability to Siemens 3RT contactors make it an ideal choice for space-constrained applications, simplifying installation and reducing wiring complexity in motor control centers, industrial panels, and automation systems. Engineered for durability and consistent performance, the 3UN2100-0CN7 provides essential circuit protection, enhancing the longevity and efficiency of your electrical installations.

Key Features & Benefits:

Precise Motor Protection: Offers a finely adjustable current setting range of 0.55 to 0.8 Amperes, ensuring accurate thermal protection tailored to your motor's specific requirements, preventing overheating and damage.
Class 10 Tripping Characteristic: Provides standard tripping times suitable for general motor applications, ensuring quick response to overload conditions while allowing for normal motor starting currents.
Compact S00 Size: Its small footprint saves valuable panel space, allowing for more efficient layout and design of control cabinets and electrical enclosures.
Direct Contactor Mounting: Designed for seamless, tool-free direct mounting onto Siemens 3RT contactors, significantly reducing installation time, wiring, and potential points of failure.
Bimetallic Technology: Utilizes proven bimetallic strips for reliable and consistent thermal sensing, offering robust and long-lasting performance in demanding industrial environments.
Manual and Automatic Reset Functionality: Provides operational flexibility, allowing operators to choose between manual reset for fault investigation or automatic reset for self-recovering processes.
Integrated Auxiliary Contacts: Equipped with 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for easy integration into control circuits, enabling status signaling, interlocking, and remote monitoring.
Phase Failure Sensitivity: Detects and trips upon loss of a phase, providing critical protection against unbalanced loads that can severely damage three-phase motors.
Temperature Compensated: Maintains consistent tripping characteristics across a wide ambient temperature range, ensuring reliable protection regardless of environmental fluctuations.
Enhanced System Reliability: Contributes to the overall safety and reliability of industrial automation systems by safeguarding motors from thermal stress and extending their operational lifespan.

Applications:

The Siemens 3UN2100-0CN7 thermal overload relay is extensively used across various industrial and commercial sectors for reliable motor protection in:
Industrial machinery and equipment, including pumps, fans, compressors, and conveyors.
HVAC systems and climate control units.
Manufacturing plants and assembly lines.
Water and wastewater treatment facilities.
Material handling systems.
Packaging machinery.
General industrial automation and control panels requiring robust motor circuit protection.

Technical Specifications:

Part Number: 3UN2100-0CN7
Alternate Part Number: 3UN21000CN7
Product Type: Thermal Overload Relay
Current Setting Range: 0.55 - 0.8 A
Tripping Class: Class 10
Size: S00
Mounting Type: Direct mounting to 3RT contactors
Auxiliary Contacts: 1 NO + 1 NC
Reset Function: Manual and Automatic
Phase Failure Sensitivity: Yes
Temperature Compensation: -20 to +60 °C
Rated Insulation Voltage (Ui): 690 V
Rated Impulse Withstand Voltage (Uimp): 6 kV
Ambient Operating Temperature: -20 to +60 °C
Standards: IEC 60947-4-1, UL, CSA
Weight: 0.12 kg